【摘要】 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。更多还原

【Abstract】 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 microscope( 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. 11 ± 6. 42) MPa respectively( P = 0. 031). Conclusion: Degassing can improve metal-ceramic bonding strength of Pd-Ag alloy significantly.更多还原