CAJ | 학술논문

采用 Ti／C／CBN 粉体为原料，通过自蔓延高温烧结（SHS）技术，制备了 TiC 结合剂 CBN 复合材料。研究了 Al 添加剂与 CBN 粒度对烧结试样的物相组成与显微形貌的影响。研究结果表明：Ti／C／CBN 试样（质量分数为10％ CBN）反应后可生成 TiC 为主相的材料，同时 CBN 与 Ti 反应生成 TiN 和TiB2。但在反应后 CBN 发生严重的热损伤，颗粒上出现大量裂纹。在原料中添加适量 Al ，可避免 CBN严重的热损伤，同时生成 TiN 、TiB2、Al3 Ti 、AlB2等物相。 SHS 反应后，较粗粒度的 CBN 颗粒表面会形成平均粒径约2．3μm 的表面组织，而较细粒度的 CBN 颗粒与基体反应程度较大，部分 CBN 与基体元素反应形成过渡层，过渡层中组织的平均粒径约0．8μm 。
채용 Ti／C／CBN 분체위원료，통과자만연고온소결（SHS）기술，제비료 TiC 결합제 CBN 복합재료。연구료 Al 첨가제여 CBN 립도대소결시양적물상조성여현미형모적영향。연구결과표명：Ti／C／CBN 시양（질량분수위10％ CBN）반응후가생성 TiC 위주상적재료，동시 CBN 여 Ti 반응생성 TiN 화TiB2。단재반응후 CBN 발생엄중적열손상，과립상출현대량렬문。재원료중첨가괄량 Al ，가피면 CBN엄중적열손상，동시생성 TiN 、TiB2、Al3 Ti 、AlB2등물상。 SHS 반응후，교조립도적 CBN 과립표면회형성평균립경약2．3μm 적표면조직，이교세립도적 CBN 과립여기체반응정도교대，부분 CBN 여기체원소반응형성과도층，과도층중조직적평균립경약0．8μm 。
TiC bonded CBN composites were synthesized by self‐propagation high‐temperature sintering ( SHS) technology from Ti/C/CBN and Ti/ Al/C/CBN powders . Effects of CBN size on the phase composition and morphology on the obtained samples were studied . The results showed that the main phase of the Ti/C/CBN sample was TiC . Additionally , CBN reacted with Ti to from TiN and TiB2 . CBN was seriously heat damaged and broken . When appropriate amounts of Al were added into the raw materials , heat injury of CBN could be inhibited . CBN reacted with Ti and Al to from TiN , Al3 Ti , AlB2 and TiB2 . After SHS reaction , on the surface of coarse CBN particles there formed transition layer organization with the average size of about 2 .3 μm . But on fine CBN particles , it had a larger reaction degree . Some fine CBN particles might react with the matrix element to obtain transition layer . The organization in the transition layer was finer with a size of about 0 .8 μm .