Objective:To investigate the effect of degassing and peroxidation on metal-ceramic bonding strength of Pd-Ag alloy. Methods:The metal-ceramic interface of group A (peroxidation)and B (degassing)was investigated under scanning electronic micro-scope(SEM)and energy dispersive spectrum (EDS).The bond strength between metal and ceramics was measured using a three-point bend test according to ISO9693.Results:The formation of nodules on the surface of alloy specimens was observed in both groups by SEM.The nodules on the specimens of group A were more densely than those of group B.The diameter of nodules in group B was 1 .5μm approximately.The interface of the metal-ceramic specimens had a clear transition porcelain layer and no hole or slit was present. The mean bonding strength of group A and B was (45.97 ±3.92)MPa and (49.1 1 ±6.42)MPa respectively(P=0.031 ).Conclu-sion:Degassing can improve metal-ceramic bonding strength of Pd-Ag alloy significantly.%目的：研究上瓷前不同预处理条件对钯银合金金瓷结合强度的影响。方法：用扫描电镜（SEM）和X线衍射（EDS）分析A组（预氧化）、B组（除气）的金属表面以及金瓷结合界面，用ISO9693规定的三点弯曲测试分别测定试件的金瓷结合强度。结果：扫描电镜和X射线衍射：2组金属试件预处理后表面均可见突起的小瘤状结构，A组试件的小瘤较多、密度较大，大部分融合成条状、片状；B组试件的小瘤较少、密度较小，圆形颗粒状，直径约为1．5μm左右。2组试件金瓷结合界面均有清晰的含有较多颗粒状物的过渡瓷层，金瓷结合紧密。A组和B组金瓷结合强度分别为（45．97±3．92）MPa和（49．11±6．42）MPa（P＝0．031）。结论：钯银合金除气比预氧化可以获得较高的金瓷结合强度。
展开▼
