Tungsten Alloy Injection Molding Technology Deoxy And Sintering

Binder is linked with skim , skim binder determines the way . Degreasing methods include conventional thermal degreasing, solvent degreasing, siphon degreasing , BASF Catalysis skim . Wiech invention also includes degreasing solvent vapor degreasing solvents and high pressure degreasing . Degreasing process caused by changes in C content alloys have a great impact . The success of defatted skim from deformation, cracking , size change , degreasing time , environmental factors, such as the level of cost considerations.

Several methods have their own shortcomings skim . Binder with skim selection should be based economy, no environmental pollution , alloy composition and thickness of the parts . Although there are many ways bonding agent and degreasing , but the wax-based bonding agent has many advantages , in practice, still wax based adhesives and hot degreasing .

PIM thermal debinding is the most difficult and most important step . Degreasing process the incorrect way and skim skim process parameters lead to distortion , cracking, stress and gas inclusions , the product contraction inconsistent. After degreasing its sintering is also important in the cracks generated during degreasing and sintering deformation can not be compensated for densification of the alloy and detrimental to the performance . Thermal debinding temperature is too high , easy to produce carbonation, the alloy performance is greatly affected. Therefore, the selection process is correct or not defatted sample would produce internal defects and alloys have a great impact . PIM contains large amounts of feed in the binder , the strength of the blank after degreasing is very low, almost loose powder aggregates. Therefore , a large shrinkage during the sintering process , easy to collapse , and bending deformation . Especially for liquid-phase sintering of tungsten alloy, high density , required to achieve full densification sintering temperature , the liquid volume, the sintering time is long , W phase and liquid phase density difference is large, the liquid phase sintering process , under the action of gravity , because the liquid flow W rearrangement generation of particles , the collapse and deformation more severe , seriously affecting the homogeneous nature , alloys and control of dimensional accuracy , limiting the complex near-net- shape forming part of . Hence, throughout the injection molding technique, how to control the deformation of the liquid phase sintering process but PIM key issues need to be addressed . Lower the sintering temperature and promote densification during liquid phase sintering can be controlled deformation .



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