CAJ | 학술논문

利用添加3％、5％的 Ni-Cr 合金在保护气氛炉中制备金刚石试样，钎焊温度为1050℃，保温5 min。采用扫描电镜分析钎焊金刚石形貌和钎缝的微观组织，维氏硬度计测量接头的硬度。结果表明：添加 Ni ／C 的 Ni-Cr 合金对金刚石具有较好的润湿性，可以实现高强度连接，碳化物在金刚石表面形核和结晶长大，与金刚石表面的原子分布具有一定位向关系。钎缝中形成的空心 Cr7C3和簇状共晶石墨与添加的 Ni ／C 有关，钎焊层中有少量 Ni ／C剩余，硬度从830HV0．2降低到700HV0．2，这有利于降低钎焊热应力和金刚石后期的出露高度。
이용첨가3％、5％적 Ni-Cr 합금재보호기분로중제비금강석시양，천한온도위1050℃，보온5 min。채용소묘전경분석천한금강석형모화천봉적미관조직，유씨경도계측량접두적경도。결과표명：첨가 Ni ／C 적 Ni-Cr 합금대금강석구유교호적윤습성，가이실현고강도련접，탄화물재금강석표면형핵화결정장대，여금강석표면적원자분포구유일정위향관계。천봉중형성적공심 Cr7C3화족상공정석묵여첨가적 Ni ／C 유관，천한층중유소량 Ni ／C잉여，경도종830HV0．2강저도700HV0．2，저유리우강저천한열응력화금강석후기적출로고도。
Ni-Cr alloy adding with Ni /C of 3%,5% was utilized to braze diamond grains in protective furnace with the temperature 1 050 ℃ and holding time 5 min,respectively.Diamond morphology and the brazed joint mi-crostructure were analyzed with the help of scanning electron microscope;the brazed joint hardness was measured by Vickers.The results show that Ni-Cr alloy adding with Ni /C has good wettability with diamond;it could a-chieve high strength bonding between diamond and brazing layer.Carbide crystallizes and nucleates on the surface of diamond has an orientation relationship with diamond surface.The Cr7 C3 morphology is hollow and clusters eu-tectic graphite forms in the brazing layer,which has a relationship with the adding Ni /C.There is small amount of Ni /C within brazing layer,the brazed joint hardness falls from 830 HV0.2 to 700 HV0.2,this is benefit to de-crease the thermal stress and improve the protrusion of diamond in the later grinding.