JB/T 7987-1997 JB/T 7989-1997 Technical conditions for super abrasive synthetic diamond JB/T7989-1997 Standard download decompression password: www.bzxz.net

JB/T7989--1997bZxz.net
This standard is a revision of JB/T7989-95 (formerly GB6407-86) based on the rapid development of the domestic artificial diamond industry. According to the implementation of the standard in recent years, with reference to relevant test reports, and based on the actual test results of domestic and foreign samples, some clauses and contents have been removed and revised, and impact toughness test items and index requirements have been added. This standard specifies the technical requirements, test methods and acceptance rules for artificial diamonds. This standard is one of the main standard projects in the industry, and together with the referenced standards and other related standards, it constitutes a complete set of artificial diamond product standards. This standard is proposed and managed by the National Technical Committee for Standardization of Abrasives and Grinding Tools. The drafting unit of this standard: Zhengzhou Abrasives and Grinding Research Institute. The main drafters of this standard: Huang Yangfen, Tian Songqiao, Zhang Junxiang. 33
1 Scope
Machinery Industry Standard of the People's Republic of China
Superhard Abrasives
Technical Conditions for Artificial Diamond
JB/T7989—1997
Replaces JB/T 7989-95
This standard specifies the particle size composition, impact toughness, compressive strength, bulk density, impurity content, inspection methods and acceptance rules for artificial diamond.
This standard is applicable to the static pressure synthesis of single crystal artificial diamond for the manufacture of abrasive tools and drilling and sawing tools. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T6405--94 Varieties of artificial diamond and cubic boron nitride GB/T6406--96 Particle size of superhard abrasive diamond or cubic boron nitride JB/T3584-84 Determination method of bulk density of superhard abrasive JB/T6571--93 Determination method of impact toughness of artificial diamond or cubic boron nitride JB/T7988.1--95 Determination method of compressive strength of artificial diamond or cubic boron nitride JB/T7988.2-95 Inspection method of impurities of artificial diamond or cubic boron nitride 3 Variety code
The variety code of artificial diamond shall comply with the provisions of GB/T6405. 4 Technical requirements
4.1 Grain size composition
The grain size composition shall comply with the provisions of GB/T6406. 4.2 Impact toughness
Impact toughness is characterized by the number of half-crushing times, and its value shall not be lower than that specified in Table 1. 4.3 Compressive strength
4.3.1 The average compressive strength shall not be less than that specified in Table 2. 4.3.2 The number of particles with compressive strength values ​​lower than half of the specified average shall not be more than 15%. 4.3.3 The number of particles with compressive strength values ​​higher than the specified average shall not be less than 50%. 4.4 Bulk density
The bulk density of each grade shall meet the following requirements: RVD shall not be less than 1.35 g/cm\;
MBD shall not be less than 1.95 g/cm,
SMD shall not be less than 2.00 g/cm.
Approved by the Ministry of Machinery Industry of the People's Republic of China on August 18, 199734
Implementation on October 1, 1998
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4.5 Impurity content
The impurity content shall conform to the following provisions:
JB/T7989--1997
For particle size of 120/140 and coarser, the impurity content shall not exceed 0.5% (particle percentage); for particle size of 140/170 and finer, the impurity content shall not exceed 1.0% (particle percentage). 5 Test methods
The particle size composition shall be tested in accordance with GB/T6406. 5.1
5.2 The impact toughness shall be tested in accordance with JB/T6571. 5.3 The compressive strength shall be tested in accordance with JB/T7988.1. The carbide indenter and gasket are made of YG6X, with a hardness of not less than 91HRA, and the surface roughness:
The test particle size 70/80 and its coarser is Ra not more than 0.80μm The test particle size 80/100 and its finer is Ra not more than 0.20μm5.4 The bulk density shall be tested in accordance with JB/T3584. The impurity content shall be tested in accordance with JB/T7988.2. 5.5
6 Acceptance rules
Each batch of products shall be inspected and accepted in accordance with technical requirements, and a certificate of conformity shall be attached. 6.2 Each batch of products should first be tested for particle size composition, and then the remaining items should be inspected and accepted after passing the test.
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