B-C-N-Ti四元超硬复合材料的高压烧结OA北大核心CSTPCD
High Pressure Sintering of B-C-N-Ti Quaternary Superhard Composites
以金刚石、立方氮化硼(cBN)和钛(Ti)为初始材料,通过高温高压反应烧结制备了 B-C-N-Ti四元超硬复合材料.结果表明:在高温高压下,Ti与金刚石及 cBN反应生成TiC0.7N0.3 和TiB2;TiC0.7N0.3 作为黏结相以键合金刚石和cBN晶粒,适量Ti的加入可以有效地提高烧结体的韧性;反应生成的TiC0.7N0.3 和TiB2 等陶瓷相以及cBN对金刚石晶粒的包裹提高了烧结体的抗氧化性.当金刚石、cBN和Ti的摩尔比为2∶1∶0.10 时,在压力为12 GPa、温度为2 000℃、保温 5 min的条件下得到的烧结样品性能较好,其维氏硬度达到(49.0±1.2)GPa,韧性为(14.2±0.6)MPa·m1/2,空气氛围下的起始氧化温度为 921℃.
In this work,the B-C-N-Ti quaternary superhard composite was prepared by high pressure and high temperature sintering with diamond,cubic boron nitride(cBN)and titanium(Ti)as starting materials.The characterization results show that Ti reacts with diamond and cBN to form TiC0.7N0.3 and TiB2 under high pressure and high temperature,which acts as the binding additives for diamond and cBN grains.The addition of appropriate amount of Ti can effectively improve the toughness of the sintered composite specimen.The formation of TiC0.7N0.3 and TiB2 ceramics and cBN coated the diamond grains and greatly enhanced the oxidation ability.When the molar ratio of diamond,cBN and Ti is 2∶1∶0.10 and sintered at 12 GPa and 2000℃for 5 min,the specimen exhibits the best performance with Vickers hardness of(49.0±1.2)GPa,fracture toughness of(14.2±0.6)MPa·m1/2 and oxidation temperature of 921℃under air condition.
黄鸿东;于晓辉;贺端威
四川大学原子与分子物理研究所,四川 成都 610065中国科学院物理研究所,北京 100190
金刚石立方氮化硼钛超硬复合材料高温高压烧结
diamondcBNtitaniumsuperhard compositeshigh pressure and high temperaturesintering
《高压物理学报》 2024 (004)
63-69 / 7
国家重点研发计划(2023YFA1406200)
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