真空净化处理对掺杂烧结型金刚石聚晶耐磨性的影响  

INFLUENCE OF THE VACUUM TREATMENT ON WEARING CAPACITY OF SINTERED POLYCRYSTALLINE DIMOND (PCD)

作　　者：王德新[1] 焦庆余 王福泉[1] 郑振凯[1] 

机构地区：[1]胜利油田钻井工艺研究院

出　　处：《高压物理学报》1989年第4期315-320,共6页Chinese Journal of High Pressure Physics

摘　　要：本文对金刚石原料和不同结合剂进行了真空净化处理试验研究。金刚石原料粒度越细,d 电子亏损越多的过渡元素做结合剂,通常越需真空净化处理,方能烧结成高耐磨性聚晶金刚石。The surface state of the diamond grains greatly effects the working capability of the PCD sintered under superpressure and high temperature. Usually the diamond grains are treated by vacuum or cation bombardment so that its surfaces are in a purer state than those sintered only under superpressure and high temperature, such diamond grains are more intense. This paper discusses the effects of the vacuum treatment method with different binders and grain sizes. First the raw material are treated for an hour in the condition of 10-3Pa and 600℃ . next sintered them by high temperature in a type DS-029B 5.884×106N/35 .304×106 N (600/3600T) superpressure apparatus, lastly we last their wearing capacity.we choose three kinds of binders: TiSi-B, CrSi-B and NiSi-B, in which the weight percentages of Si, B and metals all keep the same.The weight proportions of all the binders to diamond are 1:9. When the raw meterial were not treated by vacuum, the wearing capacity sequence of the binding PCD was: TiSi-B<CrSi-B<NiSi-B.After treatment in vacuum, their wearing capacity are all increased and their sequence is changed to TiSi-B>CrSi-B>NiSi-B. Obviously, the wearing capacity of TiSi-B increased greatly.Using TiSi-B type binder and choosing two dimond grain sizes, one was coarse and another was fine, the weight proportions of binder to diamond were the same as above. We compared the effects of vacuum treatment and grain sizes. When it was not treated by vacuum, the wearing capacity of the coarse grain was higher than that for fine grain. After treatment, the wearing capacities of both cases are increased, but that of the fine grain increases 4. 8 times and the coarse one only 2.2 times, the sequence order is reversed. So the authors sugguest that if using diamond of fine grain size and binders of transition element with loss in more d-electrons, treated in vacuum, it is possible to get high wearing capacity PCD.

关 键 词：人造金刚石 掺杂烧结 真空净化处理 

分 类 号：TQ127.11[化学工程—无机化工]