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| Cause analysis of foreign matter precipitation on the surface of ferrous P/M parts and countermeasures |
| LI Ziyang，LUO Wenfeng，ZUO Xinlang，ZHANG Kun，ZHU Gang |
| Reliability Research and Analysis Center, China Electronic Product Reliability and Environmental Testing
Research Institute, Guangzhou 511370, China |
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Abstract Foreign matter on the surface of a powder metallurgy part of a compressor resulted in the failure of the
product. The pores and oxides on the surface of the part were observed by scanning electron microscopy. The
results showed that there were many open pores on the surface of the part after machining because of insufficient
steam oxidation reaction inside the part. By analyzing the steam treatment process of the failed parts, it is found
that the reason is the improper setting of steam treatment temperature and time, and further reveals the failure
mechanism. By improving the powder proportion of matrix material, forming density and steam treatment technology,
the problem of foreign matter precipitation on the surface of parts was effectively solved.
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Received: 19 March 2021
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Corresponding Authors:
朱刚（1990—），男，硕士，工程师，主要研究方向为金属材料失效分析。
E-mail: liziyang365@163.com
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2022, Vol. 32 
