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采用自催化镀方法对Al_2O_3陶瓷表面进行3Ni-B镀层金属化处理,然后,把金属化的Al_2O_3分别和Ni、Fe-Ni合金组成偶对,进行了固相压力扩散焊,并通过组织成分分析对界面区的固相反应进行研究。结果表明,经特殊预处理的99%Al_2O_3陶瓷,其表面镀层Ni-B与基体的结合强度可达250MPa以上,镀层呈非晶态,而热处理后可完全晶化。Ni-B/Ni(Fe-Ni)对,界面消失,成分完全均匀;Al_2O_3/Ni-B对,机械咬合紧密,在一定厚度的互扩散层(2.5μm)。试验中还发现,在压力扩散下,镀镍薄层(约8μm)表现出异常的扩散能力,尤其Al ̄(3+)向镀层小的扩散能力非常强,值得注意。
The surface of Al 2 O 3 ceramic was metallized by 3Ni-B plating by using autocatalytic plating method. Then, the metalized Al 2 O 3 was pair-coupled with Ni and Fe-Ni alloy respectively and subjected to solid-phase pressure diffusion welding. The solid-phase reaction in the interface region was studied. The results show that the 99% Al_2O_3 ceramics pretreated with Ni-B coating has a bonding strength of more than 250MPa, the coating is amorphous, and can be completely crystallized after heat treatment. Ni-B / Ni (Fe-Ni) pairs, the interface disappears, the composition is completely uniform; Al_2O_3 / Ni-B pairs, mechanical bite close, at a certain thickness of the interdiffusion layer (2.5μm). It was also found that under pressure diffusion, the nickel-plated thin layer (about 8μm) showed abnormal diffusion ability. In particular, it is noteworthy that Al ~ (3+) has a very small diffusion capacity into the coating.