1 Scope
This standard specifies the determination devices and determination methods for toughness index of synthetic diamond.
This standard is applicable to the determination of toughness index of synthetic diamond with grain size of 16/18~325/400.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to investigate the possibility of applying the latest editions of these documents. For undated references, the latest edition applies to this standard.
GB/T 308 Rolling Bearings - Steel Balls (GB/T 308-2002, ISO 3290:1998, NEQ)
GB/T 6406 Super Abrasive - Grain Sizes of Diamond or Cubic Boron Nitride (GB/T 6406-1996, eqv ISO 6106:1979)
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
impact frequency
revolution number in unit time of the driving gear of toughness index determinator, expressed in r/min
3.2
impact counts
revolution number of driving gear in the duration that the specimen is subject to impact
3.3
unbroken ratio
ratio of the mass of residue on sieve of the specimen after being subject to certain impact counts according to specified impact frequency and sieved according to the specified conditions to the initial mass of specimen, expressed as a percentage
3.4
toughness index
capability of specimen to resist the impact effect, without breaking. The index value shall be represented by the unbroken ratio multiplied by 100
4 Method Summary
Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Method Summary
5 Determination Devices and Synthetic Diamond Standard Specimen
5.1 Toughness Index Determinator
5.2 Sieve Machine and Test Sieve
5.3 Balance
5.4 Synthetic Diamond Standard Specimen
6 Specimen Preparation
7 Determination Method
7.1 Preparation prior to Determination
7.2 Impact Counts
7.3 Impact Specimen
7.4 Sieving
7.5 Calculation of Toughness Index Determination Value of Specimen
7.6 Correction of Toughness Index Determination Value of Specimen
Figure 1 Schematic Diagram for Vibration Device
Figure 2 Specimen Tube
Table 1 Impact Counts for Synthetic Diamond of Each Grain Size No.
