Abstract In this article,the influence of synthesis temperature on polycrystalline diamond(PCD)was investigated 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 simultaneously,which improved its uniform distribution.

Keywords  PCD;synthesis temperature;grain size

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