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Study on technology and properties of fe-2ni base alloy steel powder injection molding

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2020-02-19 15:46:00
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Powder Injection Molding, which abbreviation is PIM, is a new near-net-shape technology of combining powder metallurgy, powder ceramics and plastic injection

molding technology. 

In other words briefly is that people use plastic injection molding technology to make metals and ceramics products.

Metal powder injection molding is a new high technology that has powerful prospect

It has advantages in making high property products of complex geometry shapes and

uniform tissue textures which are near final shapes. Binder is the key of PIM. In research, who puts point to binder and de-bind has got the point of problem. In this

paper, I have evaluated a suitable method for MIMS binder and de-bind techniques. 

This is to guide research of binder and de-bind Main jobs I did as follows:

In the basic of FE-2NI alloy steel powder, I have designed two binders systems.

It indicated that the binder 66PW+10HDPE420EVA+4SA was suitable for FE-2NI MIM Influence of key injection molding process parameters on quality of injection-molded specimens is studied and parameters are optimized using orthogonal arrays experimental design and statistical analysis method. The result shows that not only the levels of parameters but also some interaction between parameters have great influence on the quality of green parts. The optimized injection parameters are as following

Injection pressure 14MPA, injection temperature 140 C, injection speed 80mm/s and

holding pressure 8MPA.

The process of solvent de-binding and thermal de-binding were researched. The solvent I choose were n-Heptane and n-Hexane. After solvent de-binding was thermal de-binding process, Suitable process of solvent de-binding and thermal de-binding was determined. 

It indicated that at temperature of 40 C, 66PW-+10HDPE+20E VA+4SA system of binder in the n-hexane solvent de-binded 8 hours could get best specimens. 

After that I was according to TGA curves of binder to design the best thermal de-binding method. 

This method can de-bind efficiency and shorten time. The specimen I got was regular without defects

Sintering process was designed. It indicated that use pre-sintering +sintering process could reduce effect of oxidation

The specimens were tested after heat treatment. It indicated that specimens density was highest in sintering temperature of 1370 C, and the hardness was the highest in sintering temperature of 1360-1370C. The specimen could get the highest tensile strength in sintering temperature of 1390 and tempering temperature of 400C

Then was the 1370C sintering temperature, it indicated from analysis of fracture of specimen that tensile fracture had clearly tear-corrugation, It belongs to ductile fracture. But it could also see some defects such as holes and crackles.

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