铁基粉末冶金零件的急冷发黑处理 |
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引用本文: | 廖永琦. 铁基粉末冶金零件的急冷发黑处理[J]. 粉末冶金技术, 1988, 6(4): 219-222 |
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作者姓名: | 廖永琦 |
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作者单位: | 广州粉末冶金厂 |
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摘 要: | 本文介绍一种新型的急冷发黑工艺。零件经过这种工艺处理后,不但提高了抗蚀性,而且也改善了机械性能,从而增加零件的表面硬度及强度。
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RAPIDLY COOLING BLACKENING OF P/M IRON BASE PARTS |
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Affiliation: | Guangzhou Powder Metallurgy Factory |
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Abstract: | This paper deals with a new process of rapidly cooling blackening. Its treatments are as follows:the parts are heated in air atmosphere in a furnace at the temperature 500-600℃ for a given time and followed by quenching in cooling liquid to room temperature. A black oxide coating on the parts can be obtained when they are moved out from liquid. The composition of liquid is 25-28%mineral oil, 1-2% NaNO2, 0.2-0.3% Na2CO3 and 70%water. It shows in practice that this technology not only improves corrosion resisitence,but also increases mechanical properties,surface hardness and strength. |
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