cubic silicon nitride

cubic silicon nitride, Total:192 items.

The international standard classification for "cubic silicon nitride" includes: Abrasives , Turning tools , Other cutting tools , Refractories , Ferroalloys , Cutting tools in general , Advanced ceramics , Powder metallurgy , Ceramic and glass insulating materials , Cutting tools .

The Chinese standard classification for "cubic silicon nitride" includes: Grinding material and apparatus , Cutting tools , Special refractory , Iron alloy , Special ceramics , Metal and alloy powder , Fireproof material in general , Powder metallurgy material and product .

Professional Standard - Machinery

JB/T 10719-2007 Turning tools for cutting slot with brazed polycristalline diamond or cubic boron nitride
JB/T 7990-2012 Superabrasive - Synthetic Diamond and Cubic Boron Nitride Micropowder
JB/T 10722-2007 End mills with brazed polycristalline diamond or cubic boron nitride
JB/T 6571-1993 Method for measuring impact ductility of man-made diamond and borazon
JB/T 10645-2006 Special products of silicon carbide-Silicon nitride bonded silicon carbide-Nozzle tubes
JB/T 10152-2010 Special products of silicon carbide-Silicon nitride bonded silicon carbide-Plate
JB/T 10152-2000 Special products of silicon carbide - Slab of silicon nitride bonded silicon carbide
JB/T 7990-1998 Super-hard abrasive Micro powder of man-made diamond and borazon
JB/T 11451-2013 Face Milling Cutter Cartridge with Brazed Polycrystalline Diamond or Cubic Boron Nitride
JB/T 7994-2012 Superabrasive — Chemical analysis method for cubic boran nitricle
JB/T 8002-1999 Superabrasive Products - Synthetic Diamond or Cubic Boron Nitride Lapping Paste
JB/T 8724-2023 Silicon nitride seal ring for mechanical seal
JB/T 10723-2007 Boring with brazed polycristalline diamond or cubic boron nitride
JB/T 7994-1999 Chemical analysis methods of cubic boron nitride
JB/T 10724-2007 Honingstone of diamond or cubic boron nitride-Technical requirement
JB/T 10891-2008 Special products of silicon carbide—Silicon nitride bonded silicon carbide—Beam
JB/T 10721-2007 Reamers with brazed polycristalline diamond or cubic boron nitride
JB/T 10720-2007 Turning tool with brazed polycristalline diamond or cubic boron nitride
JB/T 10152-2023 Silicon carbide special products silicon nitride bonded silicon carbide plate

Professional Standard - Ferrous Metallurgy

YB/T 4239-2010 Ferrosilicon nitride
YB 4035-1991 Silicon nitride bonded silicon carbide bricks for blast furnace
YB/T 174.2-2000 Chemical analysis for silicon nitride bonded silicon carbide product. Determination of silicon carbide content. High pressure dissolve specimen method
YB/T 4035-1991 Silicon nitride bonded silicon carbide bricks for blast furnace
YB/T 174.4-2000 Chemical analysis for silicon nitride bonded silicon carbide product. Determination of iron oxide content. o-Phenanthroline photometric method
YB/T 4035-2007 Silicon nitride bonded silicon carbide bricks
YB/T 174.1-2000 Chemical analysis for silicon nitride bonded silicon carbide product. Determination of silicon nitride content. High pressure dissolve specimen method
YB/T 174.3-2000 Chemical analysis for silicon nitride bonded silicon carbide product. Determination of free silicon content. Molybdenum blue photometric method

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB/T 6405-1994 Types of synthetic diamond and cubic boron nitride
GB/T 16555-2008 Chemical analysis of refractories containing carbon and silicon carbide or nitride
GB/T 6405-2017 Superabrasive—Types of cubic boron nitride
GB/T 6966.1-1986 Types of synthetic diamond micropowder and cubic boron nitride micropowder
GB/T 31703-2015 Ceramic ball bearings―Silicon nitride balls
GB/T 6406-1996 Super abrasive -Grain sizes of diamond or cubic boron nitride
GB/T 21951-2008 Cubic boron nitride inserts tipped or solid - Dimensions
GB/T 6408-2003 Super abrasive—Cubic boron nitride
GB/T 6409.3-1986 Diamond or cubic boron nitride--Hand sticks
GB 11272-1989 Diamond or cubic boron nitride sticks
GB/T 30061-2013 Ferromanganese-silicon Nitride
GB/T 6409.4-1986 Marking and packing for diamond or cubic boron nitride abrasive products
GB/T 31703-2015(英文版) Ceramic ball bearings-Silicon nitride balls
GB/T 21951-2023 Cubic boron nitride inserts, tipped or solid—Dimensions，types

国家市场监督管理总局、中国国家标准化管理委员会

GB/T 6408-2018 Superabrasive—Cubic boron nitride
GB/T 37258-2018 Silicon nitride ceramic powder

机械工业部

JB/T 8001-1995 Diamond or Cubic Boron Nitride Whetstone

中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会

GB/T 16555-2017 Chemical analysis of refractories containing carbon and silicon carbide or nitride
GB/T 34216-2017 Nanoscale silicon nitride

Group Standards of the People's Republic of China

T/CNIA 0142-2022 Silicon nitride granulated powder
T/CSTM 00891-2024 Silicon nitride ferrovanadium

Professional Standard - Building Materials

JC/T 2349-2015 Si3N4 ceramic insulation components for polycrystalline silicon production
JC/T 2134-2012 Silicon nitride ceramic powder
JC/T 2342-2015 Method for the quantitative phase analysis of silicon nitride

Professional Standard - Aerospace

QJ 2586.5-1993 Cubic Boron Nitride / Technical Conditions for Cemented Carbide Lathe Tool in Welded Type
QJ 2341.3-1992 Cubic boron nitride/tungsten carbide high rigidity boring tool holder
QJ 2341.4-1992 Cubic boron nitride/tungsten carbide high rigidity boring tool technical conditions
QJ 2586.1-1993 Cubic Boron Nitride / Cemented Carbide Bullnose Tool in Welded Type
QJ 2587.2-1993 Cubic Boron Nitride / Cemented Carbide Inner-Bore Lathe Tool in Mechanical Consolidation Type
QJ 2339.4-1992 Cubic boron nitride/tungsten carbide insert technical conditions
QJ 2341.1-1992 Cubic boron nitride/tungsten carbide high rigidity through hole boring tool
QJ 2588.5-1993 Cubic Boron Nitride / Technical Specification for Cemented Carbide Lathe Tool in Indexable Type
QJ 2586.3-1993 Cubic Boron Nitride / Cemented Carbide General Purpose Thread Lathe Tool in Welded Type
QJ 2339.1-1992 Cubic boron nitride/tungsten carbide welding inserts
QJ 2341.2-1992 Cubic Boron Hydride / Cemented Carbide Unfair-hole Boring Cutter with High Stiffness
QJ 2586.4-1993 Cubic Boron Nitride / Cemented Carbide Slotting Tool in Welded Type
QJ 2339.3-1992 Cubic boron nitride/tungsten carbide mechanical clamping head
QJ 2588.3-1993 Cubic Boron Nitride / Cemented Carbide Shim for Lathe Tool in Indexable Type
QJ 2588.2-1993 Cubic Boron Nitride / Cemented Carbide Lathe Tool in Upthurst Type & Indexable Type
QJ 2339.2-1992 Cubic boron nitride/tungsten carbide indexable inserts

工业和信息化部

YB/T 4582.7-2017 Ferrosilicon nitride-Determination of total nitrogen content-Neutralization titration method
JB/T 10645-2020 Special products of silicon carbide-Silicon nitride bonded silicon carbide-Nozzle tubes
JB/T 13943-2020 Superabrasive products-Diamond or cubic boron nitride abrasive cloth

Military Standard of the People's Republic of China-General Armament Department

GJB 5332-2004 Silicon nitride bearing ball specifications
GJB 10063-2021 Silicon nitride ceramic polishing mask specification
GJB 10064-2021 Specification for silicon nitride ceramic rain erosion heads

工业和信息化部/国家能源局

JB/T 12981-2016 Polycrystalline cubic boron nitride for superabrasive metal processing
JB/T 13306-2017 Superabrasive一Testing method of impurity content in cubic boron nitride

Taiwan Provincial Standard of the People's Republic of China

CNS 12786-1990 Method of Chemical Analysis for Silicon Nitride Powders

Japanese Industrial Standards Committee (JISC)

JIS B 4131:1998 Diamond/CBN products -- Diamond or CBN grinding wheels
JIS B 4130:1998 Diamond/CBN products -- Grain sizes of diamond or cubic boron nitride
JIS B 4138:1998 Diamond/CBN products -- Diamond or CBN segmented saws
JIS B 4138:1994 Diamond or cubic boron nitride segmented saws
JIS B 4131:1993 Diamond or cubic boron nitride grinding wheels
JIS R 1640:2002 Methods for the quantitative phase analysis of silicon nitride
JIS B 4140:1997 Diamond or cubic boron nitride electroplated tools
JIS B 4130:1982 Grain sizes of diamond or cubic boron nitride
JIS B 4141:1998 Diamond/CBN products -- Diamond or CBN grinding wheels and saws -- Dimensional characteristics and code for the forms
JIS B 1563:2009 Rolling bearings -- Silicon nitride balls
JIS R 1603:2007 Methods for chemical analysis of fine silicon nitride powders for fine ceramics
JIS R 1603:1994 Methods for chemical analysis of fine silicon nitride powders for fine ceramics

Korean Agency for Technology and Standards (KATS)

KS B 3618-2012 diamond or cubicboron nitride grinding wheels
KS B 3191-2013 DIAMOND OR CUBIC BORON NITRIDE SEGMENTED SAWS
KS B 3191-2002(2012) DIAMOND OR CUBIC BORON NITRIDE SEGMENTED SAWS
KS L 3318-1988 METHODS FOR CHEMICAL ANALYSIS OF FINE SILICON NITRIDE POWDERS FOR FINE CERAMICS
KS L 3318-1998 METHODS FOR CHEMICAL ANALYSIS OF FINE SILICON NITRIDE POWDERS FOR FINE CERAMICS
KS B 3617-2002(2012) Grain sizes of diamond or cubic boron nitride
KS B 3617-2012 Grain sizes of diamond or cubic boron nitride
KS B 3617-2002 Grain sizes of diamond or cubic boron nitride
KS L 3318-2001 METHODS FOR CHEMICAL ANALYSIS OF FINE SILICON NITRIDE POWDERS FOR FINE CERAMICS
KS L 1613-2023 Methods for chemical analysis of fine silicon nitride powders for fine ceramics
KS L 1613-1994 Methods for chemeical analysis of fine silicon nitride powers for fine ceramics
KS L 1613-2011(2021) Methods for chemical analysis of fine silicon nitride powers for fine ceramics
KS L 1613-2011(2016) Methods for chemical analysis of fine silicon nitride powers for fine ceramics
KS B ISO 6106:2003 Abrasive products－Grain sizes of diamond or cubic boron nitride

International Organization for Standardization (ISO)

ISO/FDIS 21068-2:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon
ISO/FDIS 21068-1:2023 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon
ISO/FDIS 21068-3:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon
ISO/DIS 21068-4 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon — Part 4: XRD methods
ISO/FDIS 21068-4:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon
ISO 6106:1979 Abrasive products; Grain sizes of diamond or cubic boron nitride
ISO/DIS 21068-3 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon — Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents
ISO 16462:2004 Cubic boron nitride inserts, tipped or solid - Dimensions, types
ISO 16462:2014 Cubic boron nitride inserts, tipped or solid - Dimensions, types
ISO 6168:1980 Abrasive products; Diamond or cubic boron nitride grinding wheels; Dimensions
ISO/DIS 21068-2 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon — Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, free
ISO/DIS 21068-1 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon — Part 1: General information and sample preparation
ISO 21068-1:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon-Part 1: General information, terminology and sample preparation

BSI

BS EN ISO 21068-4:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon-XRD methods
BS EN ISO 21068-3:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon-Determination of nitrogen, oxygen and metallic and oxidic constituents
DANSK DS/ISO 21068-3:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents
DANSK DS/ISO 21068-4:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Part 4: XRD methods
BS EN ISO 21068-2:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon-Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, free and sur...
DANSK DS/ISO 21068-1:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Part 1: General information, terminology and sample preparation
DANSK DS/ISO 21068-2:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, ...

RO-ASRO

STAS 12786-1989 Diamond or cubical boron nitride tools RODS FOR GRINDING Dimensions
STAS 12295/1-1989 Diamond or cubic boron nitride tools GRINDING WHEELS Main dimensions
STAS 13100-1992 Honing blades with diamond or cubic boron nitride. Main dimensions

GOSTR

GOST R 53923-2010 Diamond and cubic boron nitride (elbor) grinding wheels. Specifications

European Committee for Standardization (CEN)

FprEN ISO 21068-4 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 4: XRD methods (ISO/FDIS 21068‑4:2024)
FprEN ISO 21068-2 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, free
FprEN ISO 21068-3 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents (ISO/FDIS 21068‑3:2024)

German Institute for Standardization

DIN EN ISO 21068-4:2023-07 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 4: XRD methods (ISO/DIS 21068-4:2023); German and English version prEN ISO 21068-4:2023 / Note: Date of issue 2...
DIN ISO 16462:2015-08 Cubic boron nitride inserts, tipped or solid - Dimensions, types (ISO 16462:2014)
DIN ISO 16462 E:2014-11 Cubic boron nitride inserts, tipped or solid - Dimensions, types
DIN ISO 16462:2005 Cubic boron nitride inserts, tipped or solid - Dimensions, types (ISO 16462:2004);English version of DIN ISO 16462:2005
DIN EN ISO 21068-2:2023-07 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, fr...
DIN EN 12698-1:2007-06 Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods; German version EN 12698-1:2007
DIN EN ISO 21068-3:2023-07 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents (ISO/DIS 21068-3:2023); German and En...
DIN ISO 16462:2015 Cubic boron nitride inserts, tipped or solid - Dimensions, types (ISO 16462:2014)

SCC

DANSK DS/EN ISO 21068-4:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon – Part 4: XRD methods (ISO 21068‑4:2024)
DIN EN ISO 21068-4 E:2023 Draft Document - Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 4: XRD methods (ISO/DIS 21068-4:2023); German and English version prEN ISO 21068-4:2023
DIN EN ISO 21068-3 E:2023 Draft Document - Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents (ISO/DIS 21068-3:202...
SPC GB/T 37258-2018 Silicon nitride ceramic powder (TEXT OF DOCUMENT IS IN CHINESE)
NS-EN ISO 21068-2:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silicon, fr...
NS-EN 12698-2:2007 Chemical analysis of nitride bonded silicon carbide refractories — Part 2: XRD methods
DANSK DS/EN 12698-1:2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods

IN-BIS

IS 3264-1985 Specification for diamond or cubic boron nitride abrasive grinding wheels
IS 13564-1993 Recommendations for selection of diamond and cubic boron nitride grinding wheels
IS 12686-1989 Abrasive - diamond or cubic boron nitride micron-sized powder
IS 551-1989 Bonded abrasive products (except diamond/cubic boron nitride)—marking system

RU-GOST R

GOST 32406-2013 Diamond and cubic boron nitride tools. Safety requirements
GOST R 53001-2008 Diamond and cubic boron nitride (elbor) tools. Safety requirements

Association Francaise de Normalisation

NF EN ISO 17947:2023 Technical ceramics - Methods for the chemical analysis of fine silicon nitride powders
NF E66-317*NF ISO 16462:2014 Cubic boron nitride inserts, tipped or solid - Dimensions, types
NF E66-317:2004 Cubic boron nitride inserts, tipped or solid - Dimensions, types.

British Standards Institution (BSI)

BS 5851:1980 Specification for grain sizes of diamond or cubic boron nitride
23/30446996 DC BS EN ISO 21068-4. Chemical analysis of raw materials and refractory products containing silicon carbide, silicon nitride, silicon oxynitride and sialon - Part 4. XRD methods
BS EN ISO 21068-1:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - General information, terminology and sample preparation
BS EN 12698-1:2007 Chemical analysis of nitride bonded silicon carbide refractories - Chemical methods
23/30446960 DC BS EN ISO 21068-3. Chemical analysis of raw materials and refractory products containing silicon carbide, silicon nitride, silicon oxynitride and sialon - Part 3. Determination of nitrogen, oxygen and metallic and oxidic constituents
BS ISO 16462:2004 Cubic boron nitride inserts, tipped or solid - Dimensions, types
BS ISO 16462:2014 Cubic boron nitride inserts, tipped or solid. Dimensions, types

GSO

BH GSO ISO 16462:2016 Cubic boron nitride inserts, tipped or solid -- Dimensions, types
GSO ISO 16462:2014 Cubic boron nitride inserts, tipped or solid -- Dimensions, types

Standard Association of Australia （SAA）

ISO 21068-3:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 3: Determination of nitrogen, oxygen and metallic and oxidic constituents
ISO 21068-4:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 4: XRD methods
ISO 21068-2:2024 Chemical analysis of raw materials and refractory products containing silicon-carbide, silicon-nitride, silicon-oxynitride and sialon - Part 2: Determination of volatile components, total carbon, free carbon, silicon carbide, total and free silico...

SE-SIS

SIS SS-ISO 6106:1986 Abrasive products - G ra in sizes of diamond or cubic boron nitride

Australian/New Zealand Standard (AU-AS/NZS)

AS/NZS 4516:1998 Abrasive products - Diamond or cubic boron nitride grinding wheels - Dimensions

PL-PKN

PN M59168-1992 Abrasive products Diamont or cubic boron nitride grinding wheels Dimensions
PN M59108-1985 Grains óf diamond, cubic boron nitride or composite - Granular composition

American Society for Testing and Materials (ASTM)

ASTM C1494-01 Standard Test Methods for Determination of Mass Fraction of Carbon, Nitrogen, and Oxygen in Silicon Nitride Powder
ASTM C1494-13(2024) Standard Test Methods for Determination of Mass Fraction of Carbon, Nitrogen, and Oxygen in Silicon Nitride Powder
ASTM F2094-03a Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094-03 Standard Specification for Silicon Nitride Bearing Balls
ASTM C1494-13(2018) Standard Test Methods for Determination of Mass Fraction of Carbon, Nitrogen, and Oxygen in Silicon Nitride Powder
ASTM F2094/F2094M-14e1 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094/F2094M-18a Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094/F2094M-11 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094-01a Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094/F2094M-18 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094-01 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094/F2094M-14 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094/F2094M-08 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094-06 Standard Specification for Silicon Nitride Bearing Balls
ASTM F2094/F2094M-13 Standard Specification for Silicon Nitride Bearing Balls

YU-JUS

JUS K.F0.082-1989 Grains of ?iamon? and cublc boron nitrIde for bonded abrasive products. Hatbod of test of macrogrits

Danish Standards Foundation

DS/EN 12698-1:2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods
DS/EN 12698-2:2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 2: XRD methods

Lithuanian Standards Office

LST EN 12698-1-2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods
LST EN 12698-2-2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 2: XRD methods

Spanish Association for Standardization (UNE)

UNE-EN 12698-2:2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 2: XRD methods
UNE-EN 12698-1:2007 Chemical analysis of nitride bonded silicon carbide refractories - Part 1: Chemical methods

CEN - European Committee for Standardization

PREN 12698-2005 Chemical analysis of nitride bonded silicon carbide refractories