GB/T 3298-2022Test method for resistance to thermal shock of domestic ceramic ware (English PDF)

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 of Standardization Documents" drafted.

This document replaces GB/T 3298-2008 "Determination of Thermal Shock Resistance of Household Ceramics". Compared with GB/T 3298-2008, except for the In addition to structural adjustments and editorial changes, the main technical changes are as follows.

--- Changed the setting of the control temperature according to the requirements of thermal shock resistance (see 8.2.1, 5.2 of the.2008 edition);

--- Added incremental test method (see 8.3);

--- Added test data processing (see Chapter 9);

--- Changed the test report (see Chapter 10, Chapter 6 of the.2008 edition).

1 Scope

This document describes a method for determining the thermal shock resistance of household ceramics by temperature change. This document applies to household pottery and porcelain.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 5000 Terminology of Ceramics for Daily Use

3 Terms and Definitions

Terms and definitions defined in GB/T 5000 apply to this document.

4 Principles

By accepting the rapid changes in the external temperature, the daily-use ceramics products are observed to see whether cracks or damages appear, and determine their Thermal shock resistance.

5 Reagents or materials

5.1 Specimen basket or specimen holder.

5.2 Dyeing solution (such as ink, methylene blue solution, etc.), brush pen.

6 Instruments and equipment

6.1 Heating furnace. a heating furnace with a sufficient heating rate to ensure that the temperature rises to the test temperature within 15 minutes after the sample is placed, and the working area can be controlled. The temperature difference is within ±5°C.

6.2 Flowing water tank. flowing water that can keep the temperature at 20°C±2°C, the mass ratio of water in the water tank to the sample is greater than 10.1, and the sample is put into water.

After the test, the water surface should be about 20mm higher than the sample, and the water temperature should not rise by more than 4°C.

7 Samples

At least 5 samples shall be taken from the same production batch of products with the same specifications and shapes, and the samples shall be free of defects such as cracks and breakages.