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Ni-P alloy was chemically plated on Al2O3 ceramics to produce uniform alloy coatings at temperatures below 70~C. Cu metal was electroplated onto the Ni-P coating to facilitate the soldering and shorten the chemical plating time. Then, the electroplated ceramic specimens were soldered with 60 wt.% Sn-40 wt.% Pb solder in active colophony. The highest shear strength was acquired after the heat treatment at 170℃ for 15 min. The joint fractures mostly propagated along the interface between the ceramics and the Ni-P coating, with some fracture in both the ceramics and the Ni-P coating near the interface and some along the interface between the Cu and Ni-P coatings. The results show that ceramic surface roughness and the chemical plating parameters influence the coating quality, and that suitable heat treatment before the soldering also improves the adhesion between the ceramics and Ni-P coatings, thus strengthening the joints. 相似文献
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党的十六届五中全会提出我国今后要走"创新型国家"的道路,这是一个非常重要的战略决策。这一战略决策的提出,使创新教育在高等职业教育中占据了非常重要的地位。目前创新能力已成为现代人的重要品格之一,创新人才将成为决定一个企业乃至一个国家竞争力的关键因素。因此,培养具有创新意识、创新精神和创造能力的高技能创新型人才,既是时代的呼唤,也是时代的要求。 相似文献
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