EFFECTS OF SUBSTRATES ON SINTERING METAL INJECTION MOULDED COMMERCIALLY PURE TITANIUM

摘要

Metal injection moulding of titanium requires more attention than steel and stainless steel. A suitable substrate must be used to support specimens and allows binder to permeate during thermal debinding and sintering. Therefore, this work investigated the physical and mechanical properties of commercially pure titanium after sintering using five different substrates. The five different substrates were made of yttria, zirconia, calcium oxide and the combination of these materials, which are generally known to be stable for sintering titanium. The objective is to determine the most suitable substrate for titanium sintering. The results shown that densed substrates were not suitable for debinding and sintering. Different chemical compositions of substrates affected the ultimate tensile stress and significantly affected the elongation to failure. However, the modulus of elasticity was independent of substrates. Elongation to failure decreased as purity of stable oxide decreased. The best mechanical properties can be achieved by using a porous yttria substrate.