CAJ | 학술논문

采用了Ag-Cu-Ti 合金和纳米 TiC 粉末组成的新型复合钎料钎焊立方氮化硼(CBN)磨粒和工具基体,运用了三维体式显微镜和扫描电镜,研究了CBN磨粒与改性钎料之间的结合体系,包括界面微结构和反应产物,并进行了钎焊磨粒耐磨性试验.试验结果表明:加入的纳米TiC粉末均匀分布在钎料层内,细化了Ag-Cu-Ti合金钎料层的显微组织,有效控制了CBN磨粒与钎料的剧烈反应;磨粒表面化合物均匀致密,确保了CBN磨粒、纳米改性钎料和基体之间的结合强度;钎焊CBN磨粒的磨损形式以磨耗磨损为主,后期出现微小破碎,无磨粒脱落.
채용료Ag-Cu-Ti 합금화납미 TiC 분말조성적신형복합천료천한립방담화붕(CBN)마립화공구기체,운용료삼유체식현미경화소묘전경,연구료CBN마립여개성천료지간적결합체계,포괄계면미결구화반응산물,병진행료천한마립내마성시험.시험결과표명:가입적납미TiC분말균균분포재천료층내,세화료Ag-Cu-Ti합금천료층적현미조직,유효공제료CBN마립여천료적극렬반응;마립표면화합물균균치밀,학보료CBN마립、납미개성천료화기체지간적결합강도;천한CBN마립적마손형식이마모마손위주,후기출현미소파쇄,무마립탈락.
A new kind of composite fillers,composed of Ag-Cu-Ti alloy and nano-TiC powders,is utilized to braze cubic boron nitride (CBN) grains and tool substrate.The bonding system,including the interfacial microstructure and reactive products between CBN grains and filler layer,is observed by optical microscope and scanning electron microscope (SEM).Resistant-to-wear experiments of the brazed grains are performed.Results show that the nano-TiC powders evenly distribute in the filler layer so that the resultants grow compactly and uniformly on the surface of CBN grain.This indicates that the chemical bond is established between CBN grains and nano-TiC modified filler.Accordingly,the bonding strength of the grains is ensured.The CBN grains are worn smoothly without grain pull-out.