GB/T 1965-2023 in English

Standard Revision Background and Technical Evolution

GB/T 1965-2023 is the first revision of the 1996 version of the standard, and mainly makes technical adjustments based on the ISO 14610:2012 international standard. The standard applies to porous ceramic materials with an apparent porosity of 25%-90% and a pore size of 0.05-100μm, which expands the porosity range of materials compared to the old version.

Comparison of core technical requirements

Detailed explanation of key test steps

Main points of calculation formula update

Four-point bending strength calculation formula: σ_B=3P(Ll)/2bh²
The symbol system has been completely updated:
• The bending strength symbol has been changed from τ to σ
• The thickness symbol has been changed from d to h
New calculation of discrete coefficient: C_v=S/σ

Recommendations for standard implementation

1. Instrument selection: Four-point bending fixtures with automatic centering function are preferred to ensure span accuracy of ±0.1mm
2. Sample processing: Ultrasonic cleaning rather than high temperature treatment is recommended for contaminated samples to avoid changing the porous structure
3. Data recording: It is recommended to retain the original force-displacement curve data for at least 5 years
4. Laboratory environment: strictly control temperature and humidity (23±2℃, RH≤70%)

Difference management with ISO standards

Although this document is modified to adopt ISO 14610:2012, there are 13 technical differences, mainly including:
• Delete the exclusion clause of honeycomb ceramics in the ISO standard
• Simplify the measuring tool requirements (division value 0.02mm instead of 0.01mm)
• Increase the upper limit of apparent porosity to 90%
For specific differences, please refer to the comparison table in Appendix B of the standard.