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Defects and Control of Binders in Metal Injection Molding

Categories: ZCMIM NewsStars: 3StarsVisit: -Release time: 2019-05-10 10:46:00
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Since binder as a temporary carrier in green part, it must be removed before sintering, otherwise it will adversely affect performance of product.

In de-binding, binder escapes in the form of liquid or gas, it proceeds from surface to inside to form a continuous open pore, then be removed quickly, de-binding part is free from dirt and deformation.

Improper de-binding methods or unreasonable de-binding processes (such as excessive de-binding temperature, too fast heating rate, or improper selection of de-binding solvents) can cause following defects: bubbling, cracking, peeling, holes, soiling and deformation, etc. These defects are difficult to compensate in subsequent sintering process, which greatly damages appearance, size and performance of product.

In order to ensure that part does not appear defects such as bubbling, cracking, peeling, holes, dirty and deformation while de-binding, following principles should be followed:

1.De-binding is generally accomplished in multiple steps. First, it is accomplished in multiple steps to ensure that green part have a certain of strength to avoid deformation and cracking. Secondly, from the design of binder, it is required that the components of low molecular weight can be uniformly removed in low temperature zone, so as to avoid a large number of binders removed in a certain temperature zone, thereby avoiding cracking and drumming, bubbles and deformation. Finally, De-binding can be accomplished in multiple steps to reduce total time and control defect. For example, catalyst can remove most of binder, and then thermal debinding can reduce time greatly.

2.The de-binding rate should not be too fast, which may easily lead to defects. If de-binding speed is too fast, serious defects such as delamination, cracking and deformation will occur.

3.Select de-binding atmosphere. Atmosphere not only affects de-binding rate, but also affects the amount of residual carbon in the pyrolysis of binder. When thermal de-binding in H2 atmosphere, the removal of binder was relatively clean; thermal de-binding in N2 atmosphere easily causes residual carbon in part. The vacuum thermal de-binding rate is fast, but it is easily to cause cracked of green part.

Keywords in the article: Metal Injection Molding
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