GB/T 6408-2018Superabrasive—Cubic boron nitride (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 6408-2003 "Superhard abrasive cubic boron nitride", compared with GB/T 6408-2003 main technical changes as follows.

--- Revised the scope of application (see Chapter 1, Chapter 1 of the 2003 edition);

--- Increased the CBN500, CBN600 two varieties code and the corresponding technical requirements, the variety code increased from the original 4 6 (see Chapters 4 and 5, Chapters 4 and 5 of the 2003 edition);

--- Revised the technical requirements and test methods for impact toughness (see 5.2 and 6.2, 2003 editions 5.2 and 6.2);

--- Increased technical requirements and test methods for thermal shock toughness (see 5.3 and 6.2).

1 Scope

This standard specifies the product code, technical requirements, test methods, acceptance rules, signs and packaging of cubic boron nitride.

This standard applies to single crystal cubic boron nitride synthesized by static pressure method with particle size of 50/60~325/400.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 6406 superhard abrasive grain size inspection

GB/T 16458 Abrasives terminology

GB/T 33144 Superhard abrasive impact toughness determination method

JB/T 3584 Superhard abrasive bulk density determination method

JB/T 10985 Superhard abrasive compressive strength determination method

JB/T 11427 Super Abrasive Marking and Packaging

JB/T 13306 Superhard abrasive cubic boron nitride impurity content detection method

3 Terms and definitions

The terms and definitions defined in GB/T 16458, GB/T 33144 and JB/T 13306 apply to this document.

4 Variety code

The black cubic boron nitride varieties are CBN100, CBN300, CBN500; the amber cubic boron nitride varieties are respectively CBN200, CBN400, CBN600.

5 Technical requirements