Abstract In this paper, a six-sided top press was used to synthesize polycrystalline diamond under high temperature and high pressure conditions. The effect of synthesis temperature on the grain size of the polycrystalline diamond and the distribution of the binder was investigated. The fracture morphology of polycrystalline diamond synthesized under the same pressure and different synthesis temperature conditions was observed by scanning electron microscope. The results show that when the synthesis temperature is high (1 650 o C): the grain size is slightly smaller, the metal binder is evenly distributed; when the synthesis temperature is low (1 590 o C), the grain size is slightly larger, and the metal binder is not evenly distributed. This may be because, when the temperature is high, the diamond growth driving force is small, the growth rate is slightly slow, and the grain size is slightly smaller under the same time conditions. At the same time, the temperature is slightly higher, and the fluidity of the binder is enhanced, which is more favorable for its uniform distribution. (Diamond and Abrasives Engineering, 2009, Issue 1)
Abstract In this article, the influence of synthesis temperature on polycrystalline diamond(PC D) wass by the experiment of PCD synthesizing under high pressure and high temperature(HPHT)in a cubic press. The fractograph of synthesis PCD sample was observed by SEM at the same pressure and different synthesis temperatures. The results indicated that, the synthesis temperature affected the grain size of PCD and the distribution of the metal bond in such a rules as, the higher the temperature, the smaller the grain size, and the more uniform the distribution of metal bond, vice versa . We inferred that the diamond driving force and growth rate has decreased with the increment of temperature, SO the grain size has became smaller in the same heating time. Higher temperature enhanced the bonding fluidity simultaneous, which improved its uniform distribution.
Abstract In this article, the influence of synthesis temperature on polycrystalline diamond(PC D) wass by the experiment of PCD synthesizing under high pressure and high temperature(HPHT)in a cubic press. The fractograph of synthesis PCD sample was observed by SEM at the same pressure and different synthesis temperatures. The results indicated that, the synthesis temperature affected the grain size of PCD and the distribution of the metal bond in such a rules as, the higher the temperature, the smaller the grain size, and the more uniform the distribution of metal bond, vice versa . We inferred that the diamond driving force and growth rate has decreased with the increment of temperature, SO the grain size has became smaller in the same heating time. Higher temperature enhanced the bonding fluidity simultaneous, which improved its uniform distribution.
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