摘要
对不同烧结阶段快速冷却固化的PDC实验样品金刚石层中钴的线分布 (EDX)分析结果表明 ,PDC材料烧结中钴在金刚石层中的运动过程经历了三个基本阶段 :(1)钴固相扩散 ;(2 )钴液熔渗 ;(3)两次钴高浓度峰在金刚石层中的“波浪”式迁移过程。其中第一次钴高浓度峰与金刚石聚晶结构形成密切相关 ;而第二次钴高浓度峰则与聚晶晶粒异常长大密切相关。钴在金刚石层中的“波浪”式迁移过程是由金刚石 钴系统中金刚石溶解再结晶生长过程造成的 ,在这一过程中温度梯度gradT和碳浓度差ΔC是钴峰“波浪”式迁移的直接驱动力。
The quickly solidified samples of polycrystalline diamond compact (PDC) sintered under high pressure of 5.8 GPa and at 1300-1600℃ were studied through a SEM and an EDX micro-analyzer. It is found that the HP/HT sintering process experiences solid cobalt diffusion, molten cobalt infiltration and two wave-like cobalt peaks movement. The two wave-like cobalt peaks, which are closely related to the growth and the abnormal growth process of polycrystalline diamond, are resulted from the crystallization and recrystallization of the dissolution and precipitation of diamond. The temperature gradient and the carbon concentration difference are explained as the driving forces of the movement of the two wave-like cobalt peaks during the HP/HT sintering process.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2003年第4期377-381,共5页
Journal of Synthetic Crystals
基金
原冶金工业部九五重点攻关课题 (No .943 5a)
湖南省自然科学基金项目 (No .0 0JJY2 0 44 )
