【摘要】 目的　分析国产Ni Cr合金在烤瓷烧结条件下所生成的金属氧化膜的性能 ,探讨颈部灰线的成因。方法　应用X射线衍射法与电子扫描法对国产Ni Cr合金铸件经烤瓷烧结后 ,表面氧化膜的物相以及氧化膜与基体合金的成分进行分析 ;同时 ,应用俄歇电子能谱对经烤瓷烧结后与未经烤瓷烧结的铸件表面氧化膜的厚度、各元素变化趋势进行了分析研究。结果　经烧结后的铸件表面氧化膜中主要有Cr2 O3、NiCr2 O4、SiO2 等氧化物及合金固溶体γ相 ;氧化膜中较基体合金中Cr、Si含量高 ,而Ni含量低 ;经烤瓷烧结后氧化膜的厚度为未经烧结者的 2 5倍。结论　烤瓷后Ni Cr合金表面生成的中厚氧化膜并不完整。更多还原

【Abstract】 Objective In order to find out the causes of cervical gray line of PFM crown,the features of oxide film of Ni Cr alloy were investigated Methods 1 The phases were analyzed using x ray radiation shield 2 Compositions of oxide film and base metal were measured using electronic scanning microscope 3 The thickness of oxide film and the variations of Ni,Cr,O in oxide film were evaluated using Auger electron spectroscope Results 1 There were not only NiCr 2O 4 but also Cr 2O 3,SiO 2, and γ phase solid solution in the surface 2 The weight contents of Cr and Si were higher while Ni was lower in oxide film than in the base 3 Oxide film became much thicker(400nm:16nm) after the temperature cycling Conclusion The medium thicked oxide film was formed after baking, and it was not a complete film更多还原