| 摘要 |
The present invention relates to a method of making a sintered body comprising one or more hard constituents in a binder phase by injection molding or extrusion. According to the invention, the binder system comprises 30-70 wt % poly(ethylene-co-vinylacetate) and balance (Polyethylene)-blend-(Poly(oxy-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy)-based wax. The solids loading of the feedstock, gamma, is 0.51<gamma<0.53, calculated using the equation: <maths id="MATH-US-00001" num="1"> <MATH OVERFLOW="SCROLL"> <MROW> <MI>gamma</MI> <MO>=</MO> <MFRAC> <MROW> <MSUB> <MI>rho</MI> <MI>f</MI> </MSUB> <MO>-</MO> <MSUB> <MI>rho</MI> <MI>b</MI> </MSUB> </MROW> <MROW> <MSUB> <MI>rho</MI> <MI>s</MI> </MSUB> <MO>-</MO> <MSUB> <MI>rho</MI> <MI>b</MI> </MSUB> </MROW> </MFRAC> </MROW> </MATH> </MATHS> where rho<SUB>s </SUB>is the density of the material as sintered, rho<SUB>b </SUB>is the density of the binder system and rho<SUB>f </SUB>is the density of the feedstock, measured with a helium pycnometer. Debinding is performed by heating in a furnace in flowing hydrogen atmosphere.
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