GB/T 39688-2020 in English

VALID

Test method for determining density of ceramic coatings

Issued on:2020-12-14
Implemented on:2021-07-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
$117.00

Standard No:	GB/T 39688-2020
Document status:	VALID
Title in English:	Test method for determining density of ceramic coatings
Title in Chinese:	陶瓷涂层密度的测试方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-12-14
Implemented on:	2021-07-01
Chinese Classification:	Q32-Special ceramics
Professional Classification:	GB-National Standard
Related Keywords:	ceramic coating density detection system test method ceramic coatings introduction interpretation ceramic protective coatings composite density analysis model
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《GB/T 39688-2020陶瓷涂层密度的测试方法》由TC194（全国工业陶瓷标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Introduction

Interpretation of the core content of the standard

This standard establishes a ceramic coating density detection system based on the Archimedes drainage method, and innovatively proposes dry weight ratio parameters and multi-layer coating recursive calculation model. It is suitable for the quality control of ceramic protective coatings in the fields of aerospace, energy equipment, etc.

Comparison of key technical parameters

Test elements	Type A specimen	Type B specimen
Specimen volume	≥0.36cm³	≥0.4cm³(total)
Thickness requirement	RCR＞1/100	No specific restriction
Surface treatment	38μm fine grinding	Maintain according to the original process

Instrument and equipment specifications

The standard requires the use of an electronic balance (accuracy 0.001g) and a micrometer (accuracy 0.001mm). An aero-engine company uses a Keyence VHX-6000 digital microscope to measure coating thickness, and uses a Mettler Toledo analytical balance to control the test error within ±0.5%.

Analysis of implementation points

Environmental control: Temperature and humidity data need to be recorded, and it is recommended to test under 23±2℃/50±5%RH conditions
Sample processing: Type A samples need to be ground to obtain an equivalent matrix, and pay attention to avoid interface damage
Data verification: When the dry weight ratio k≥1, the sample needs to be re-prepared to ensure that the coating thickness meets the RCR requirements

Background of technological evolution

This standard breaks through the limitation of traditional coating testing that requires sample peeling, and realizes non-destructive testing by establishing a composite density analysis model. Compared with ASTM C914-16, a multi-layer coating recursive algorithm has been added to meet the development needs of modern functional gradient coatings.

More samples: QC/T 942-2021 GB 50021-2001(2009) DL/T 368-2010

Sample only — not a preview of GB/T 39688-2020

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