3表面冶金技术（surface metallurgy） 表面冶金技术是采用物理或化学方法，提供合 金元素并使其通过扩散进入被加热基体材料，而使 该材料原表面内形成合金层的一种表面...
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采用等离子束表面冶金技术，在Q235钢表面制备了铁基合金涂层。
The Fe-based composite coatings on Q235 steel substrate were formed by plasma jet surface metallurgy.
采用等离子束表面冶金技术，在采煤机截齿磨损严重的部位制备了与基材呈冶金结合的铁基复合涂层。
The Fe-based composite coatings were deposited on the attrition spot of cutting pick by plasma jet surface metallurgy, and metallurgical bonding was obtained between the coating and the substrate.
不幸的是尽管中国制造的平头挺杆物美价廉，但是其冶金技术遭到质疑，加工、热处理、表面硬化质量也遭质疑。
Unfortunately, though flat tappets from China are cheap, their metallurgy is suspect-and the same goes for the quality of their machining, heat treatment and surface-hardening.
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