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GB/T 45765-2025Fine ceramics - Measurement of thixotropic behaviour of ceramic slurry - Rotational viscometer method (English PDF)

精细陶瓷陶瓷浆料触变性试验方法旋转黏度计法

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

June 30, 2025

Implementation date

January 1, 2026

Scope

GB/T 45765-2025 is the English-translated version of 精细陶瓷陶瓷浆料触变性试验方法旋转黏度计法.

GB/T 45765-2025 is the Chinese national method for measuring the thixotropy of fine ceramic slurries with a rotational viscometer: how their viscosity falls under shear and recovers once shearing stops.

It defines shear stress, shear rate, viscosity, Newtonian and non-Newtonian behaviour and the flow curve, and sets the instrument, the sample handling and the way the flow curve is recorded, with annex diagrams of the apparatus, the rotors and shear stress against shear rate.

It applies to slurries with non-Newtonian behaviour, measured on coaxial cylinder, cone-and-plate or parallel-plate viscometers. Slurry laboratories use it to judge how a slip will behave during forming.

Modified from ISO 20379:2018, it was issued on 30 June 2025 and has applied since 1 January 2026.

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Document preview — GB/T 45765-2025

National Standard of the People's Republic of China

ICS: 81.060.30
Classification: Q 30

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and Definitions

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is modified to adopt ISO 20379:2018 "Fine ceramics (advanced ceramics, advanced technical ceramics) - Testing of ceramics using a rotational viscometer" Thixotropy of Porcelain Slurry.

Compared with ISO 20379:2018, this document has many structural adjustments. The table below shows the structural number changes between the two documents. See Appendix A. This document has many technical differences compared to ISO 20379:2018.

A list of these technical differences and their causes is given in Appendix B. The following editorial changes have been made to this document.

--- To coordinate with the existing standard, the name of the standard is changed to "Test method for thixotropy of fine ceramic slurry - Rotational viscometer method";

--- Deleted Note 1 of 3.5 and 3.8 in ISO 20379:2018;

--- Added Figure 1 "Diagram of equipment structure";

--- Added Appendix A (informative) "Comparison of this document with ISO 20379:2018 structure numbers";

--- Added Appendix B (informative) "Technical differences between this document and ISO 20379:2018 and their causes";

--- Added Appendix C (informative) "Schematic diagram of the test instrument rotor";

--- Added Appendix D (informative) "Schematic diagram of shear stress and shear rate".

1 Scope

This document describes a method for testing the thixotropy of ceramic slurries with non-Newtonian behavior using a rotational viscometer.

This document is applicable to the testing of ceramic slurries with non-Newtonian properties using coaxial cylinder, cone and plate, and parallel plate viscometers (see Appendix C). Thixotropy of the material.

2 Normative references

This document has no normative references.

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Shear stress

The force per unit area when a fluid is subjected to shear.

Note: See Appendix D for a schematic diagram.

3.2 Shear rate

The change ratio of the laminar flow velocity perpendicular to the direction of fluid flow when the fluid is subjected to shear force.

Note: See Appendix D for a schematic diagram.

3.3 Newtonian property

The property of a slurry that shear stress is proportional to the shear rate.

3.4 Non-Newtonianproperty

The property of a slurry in which shear stress is not proportional to shear rate.

3.5 Viscosity

The ratio of shear stress to shear rate.

3.6 Flow curve

The relationship curve between shear rate and shear stress.

3.7 Thixotropic behavior

It has time-dependent flow characteristics. When shear force is applied, the viscosity decreases with time until it reaches a constant value. When the shear force is interrupted, the viscosity decreases with time until it reaches a constant value. The viscosity should recover within a certain period of time.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 25 pages — is available in the English PDF.

Referenced standards

Cited by

GB/T 45871-2025Additive manufacturing — Alumina slurry for vat photopolymerization of ceramics

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