Research on Performance of New Pressing Binder in Hardmetal
The advantages and disadvantages between the pressing binder of hardmetal in existence are analyzed. A new type of binder named QSD is introduced and a series of properties are studied. The experiments show that QSD has been tested to dissolve in alcohol. The materials of hardmetal are milled in alcohol mixed with QSD, achieving a molecule dispersing slurry. The slurry adapts to spray drying with low viscidity. The mixture of the hardmetal prepared by QSD is fine, and soft with good flowability. They are capable of pressing complex form of products that couldn’t be formed with PEG, paraffin wax binder by comparing the experiments. The compacting force has reduced 20% compared to PEG.. The pressing products are effectively less vices of delamination and crack due to the low brittleness and high weight of compact. The products made by QSD fit continuous sintering and there are few remainder carbon in the sintered products. Microstructural observation reveals that the Co particle distributes homogeneously in the WC particle with the pressing binder QSD. So QSD is one kind of considerably ideal cemented carbide binder that combines the advantages of PEG, SBS.
Xianghua Liu, Zhengyi Jiang and Jingtao Han
X. W. Meng "Research on Performance of New Pressing Binder in Hardmetal", Advanced Materials Research, Vols. 148-149, pp. 1730-1736, 2011