CAJ | 학술논문

　　采用AgZnCuMnNi钎料高频感应钎焊聚晶金刚石复合片（PDC）与硬质合金，研究了690℃钎焊温度下不同恒温时间对其钎焊性能的影响．利用扫描电镜、电子探针、X射线衍射仪等对钎缝界面和聚晶金刚石（PCD）层的热损伤进行了分析，并测试了钎缝抗剪强度．结果表明：钎缝内主要存在Ag基固溶体、Cu基固溶体、Cu0．64 Zn0．36相和少量MnNi相，恒温时间15 s时，含Cu基固溶体、Cu0．64 Zn0．36相和MnNi相的灰黑色晶粒对钎缝起到弥散强化作用，钎缝抗剪强度达最大值350．6 MPa；随着恒温时间的延长，灰黑色晶粒平均等积圆直径逐渐变大，钎缝边界形成连续金属间化合物层，抗剪强度下降；PCD层的热损伤随钎焊中恒温时间的延长而加剧，生产中应采用较短的恒温时间．
　　채용AgZnCuMnNi천료고빈감응천한취정금강석복합편（PDC）여경질합금，연구료690℃천한온도하불동항온시간대기천한성능적영향．이용소묘전경、전자탐침、X사선연사의등대천봉계면화취정금강석（PCD）층적열손상진행료분석，병측시료천봉항전강도．결과표명：천봉내주요존재Ag기고용체、Cu기고용체、Cu0．64 Zn0．36상화소량MnNi상，항온시간15 s시，함Cu기고용체、Cu0．64 Zn0．36상화MnNi상적회흑색정립대천봉기도미산강화작용，천봉항전강도체최대치350．6 MPa；수착항온시간적연장，회흑색정립평균등적원직경축점변대，천봉변계형성련속금속간화합물층，항전강도하강；PCD층적열손상수천한중항온시간적연장이가극，생산중응채용교단적항온시간．
A AgZnCuMnNi filler metal is applied to join polycrystalline diamond compact (PDC) onto a cemented carbide substrate , using brazing temperature 690 ℃ and different holding time . The microstructure and phase composition of joints are investigated by means of scanning electron microscopy , electron probe micro-analysis and X-ray diffraction . The thermal damage layer of polycrystalline diamond (PCD) is also observed using scanning electron microscopy ,while the bond strength of joints is determined by shear testing . The microstructural investigations reveal that Ag(s .s) ,Cu(s .s) ,Cu0 .64 Zn0 .36 and a small amount of MnNi phases appear at the joint interface .The max shear strength of 350 .6 MPa is determined in samples joined at 15 s ,which is partially due to dispersion strengthening of gray-black grains which contain Cu(s .s) ,Cu0 .64 Zn0 .36 and MnNi phases in the joints .Equal-area-circle grain diameter of the gray-black grains grows with longer holding time , whereas the shear strength decreases because of the formation of continuous intermetallic compounds layer along the joint boundary .In addition ,the thermal damage of the PCD layer deteriorates with the increasing of holding time ,and shorter holding time is preferable in the production .