GB/T 45875-2025 Fine ceramics—Determination of densification properties of ceramic powders on natural sintering

Scope

This document describes a test method for evaluating the densification degree of ceramic green bodies made from ceramic powders (whether granulated or ungranulated) during high-temperature sintering, without any external pressure or densification treatment.
This document is applicable to pure oxides, oxide mixtures, and solid solutions, as well as non-oxide materials (such as carbides and nitrides) that can be sintered under vacuum or constant gas pressure (1 bar or lower) to prevent oxidation or decomposition. However, it is not applicable to ceramic materials sintered solely using pressure-assisted sintering techniques such as hot pressing (HP), hot isostatic pressing (HIP), gas-pressure sintering (GPS), or spark plasma sintering (SPS). If inorganic sintering additives are used, this should be noted in the report.
Note: 1 bar = 100 kPa.

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