Influence of binder composition on the properties of feedstock for cemented carbides

• Autorzy: Gołombek, K. , Matula, G. , Mikuła, J. , Dobrzański, L.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The plastic mixtures shaping of polymer-powder slurries with use of injection moulding and extrusion techniques for development and optimization of metal matrix tool materials reinforced with hard carbide phases. Design/methodology/approach: Mixtures preparation and preliminary tests, injection moulding and extrusion moulding processes optimization, the grain size measurement with use of laser diffraction method, torque measurement, rheological characterization, differential scanning calorimetry. Findings: All of investigated polymer-powder mixtures are proper for injection moulding and extrusion processes. Increasing the maximal possible fraction of carbides powder in the mixture is possible due to SA acid addition in the composition of binder. Advantages of SA acid as a component of binder are connected with significant decreasing the viscosity of polymer-powder mixtures as a result of SA acid presence. Binder fraction in injection moulded and extruded materials should be as small as possible, but enough for slurry moulding process. Too large fraction of binder causes the problems during degradation process because of higher shrinkage value and can be a reason of the distortion effect during sintering process. The results of bending strength measurements of injection moulded and extruded samples depends mainly on the moulding conditions, which should be optimized, to obtain the homogeneous structure of material with no discontinuities. Practical implications: Using investigated PM methods makes it possible to take advantage of injection moulding benefits obtained in area of polymer materials to fabrication of metallic materials, cermets and ceramics. There are wide possibilities of PIM (Powder Injection Moulding) method application for “near-net-shape” production of small size units with complicated shape and extended surface so the range of practical use of this method is wide and covers many aspects of life. The elimination the plastic forming and machining operations causes the significant economic and ecological benefits. Originality/value: It is expected, that the further research on developing an optimal degradation and sintering conditions may enable achieving the ready to use tool materials based on cemented carbides with the properties exceeding the classical PM processes results.

Słowa kluczowe

PL

materiały narzędziowe; metalurgia proszków; spiekanie; formowanie wtryskowe

EN

tool materials; powder metallurgy; sintering; injection moulding

• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2011
• Tom: Vol. 51, nr 2
• Strony: 116-124
• Opis fizyczny: Bibliogr. 41 poz.

Twórcy

autor

Gołombek, K.

autor

Matula, G.

autor

Mikuła, J.

autor

Dobrzański, L.

• Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland,

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