GB/T 3045-2024Conventional abrasive - Chemical analysis of silicon carbide (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 for standardization documents" Drafting.

This document replaces GB/T 3045-2017 "Chemical analysis methods for common abrasive silicon carbide". Compared with GB/T 3045-2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The sample preparation method has been changed (see Chapter 4, 3.1 and 4.2 of the 2017 edition);

b) The test steps and data processing for the combustion absorption gravimetric method for determining surface carbon (free carbon) have been modified (see 5.1.2.4 and 5.1.2.5, 3.4.1.4 and 3.4.1.5 of the 2017 edition);

c) The test procedure for the determination of silicon dioxide by spectrophotometry has been changed (see 5.2.2.4, 3.2.1.4 of the 2017 edition);

d) The test procedure for the determination of surface silicon (free silicon) by spectrophotometry has been changed (see 5.3.3.4, 3.3.1.4 of the 2017 edition);

e) Added the allowable error for the determination of loss on acid treatment (LAT) (see 5.4.6);

f) The EDTA volumetric method for determining calcium oxide and magnesium oxide has been deleted (see 3.9.1 of the 2017 edition);

g) Modified the data processing for the determination of iron, aluminum, calcium and magnesium by inductively coupled plasma emission spectrometry (see 5.8.5, 2017 edition) 3.10.5);

h) Added the applicable scope of the indirect method for determining silicon carbide content (see 7.2.2);

i) The method for determining iron, aluminum, calcium and magnesium by radiographic fluorescence spectrometry (RFA) has been deleted (see Chapter 5 of the 2017 edition).

This document is modified to adopt ISO 9286:2021 "Chemical analysis of abrasives and crystalline bulk silicon carbide".

Compared with ISO 9286:2021, this document has many structural adjustments. Comparison table of structural number changes between the two documents See Appendix A.

This document has many technical differences compared to ISO 9286:2021.

A list of these technical differences and their causes is given in Appendix B.

The following editorial changes were made to this document.

--- To coordinate with the existing standards, the name of the standard is changed to "Chemical Analysis Methods of Common Abrasive Silicon Carbide".

1 Scope

This document describes the analytical methods for the main chemical components in silicon carbide.

This document is applicable to abrasives and crystal blocks with a silicon carbide content of not less than 95% (mass fraction) surface carbon (free carbon), silicon dioxide, Analysis activities for chemical composition such as surface silicon (free silicon), acid treatment loss, iron, aluminum, calcium, magnesium, total carbon and silicon carbide.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 4676 Sampling method for common abrasives (GB/T 4676-2018, ISO 9138:2015, MOD) GB/T 6682 Specifications and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696:1987, MOD)

3 Terms and definitions

There are no terms or definitions that require definition in this document.

4 Sample preparation