Research and development of ZCMIM hard alloy technology

Have a small series from the data that the British hard alloy Association and the British Nonferrous Metals Technology Center, since 1985 began to study hard alloy injection molding technology. Key characteristics of the powder, adhesive technology, blending, rheological property, flow and deformation, extrusion forming agent rate, sintering and forming a complete product, the study involves many related fields. Let's look at a series of research reports the powder metallurgy material hard alloy technology:

(1) the rheological properties of hard alloy powder is poor, should not use the hard alloy powder mixture volume ratio higher than 65% for injection molding;

(2) polar wax used, mainly because of the lignite wax ester, rheology suitable for powder injection molding, powder mixture can produce high volume percentage and meets the requirement of the. This kind of wax and beneficial to the volatilization kinetics, he but degreasing work in under the control of, and very small paraffin in the shear stress under the influence from low volume percentage of the mixture, the segregation tendency. Full use of lignite has crystallization ester wax cracking tendency in the blank, but this by mixing appropriate proportion of different types of wax can be adjusted;

(3) the high shear melt mixing technology can effectively produce the mixture evenly;

(4) through the analysis of the rheological behavior and the viscous flow activation energy, the effective evaluation of the formability of the prescription. Influence of process parameters of temperature has significant influence on formability. The mould design plays a key role in shaping the integrity, to avoid the formation of injection mold filling behavior, otherwise prone to defect injection;

(5) the debinding atmosphere has key influence on the microstructure of sintered products. Inert atmosphere produce carbon defects, while reducing atmosphere can make the sintering product having a clear microstructure;

(6) after sintering shrinkage and die geometry and injection pressure, but in the forming of products is consistent with the contraction of each batch. General linear shrinkage rate is 17%, but it is not isotropic, the reason may be due to forming the mold cavity pressure field and temperature field gradient should be. Sinter density is greater than the theoretical density of 99%.

Shenzhen ZCMIM the company also launched a study of hard alloy injection molding process, in order to improve the hard alloy powder loading process to find suitable solutions, with hard alloy made of MIM parts products, ZCMIM will strictly, mainly with the quality and performance of the application, welcome friends you have the demand to support us, and ZCMIM together!