| 摘要 |
A sintered porous body is made from a mixture comprising by weight 20-95% metal powder, 1-25% hollow microspherical organic particles and 5-55% of a hardenable organic binder, the mixture being cured to harden, heated to decompose the organic materials and finally sintered. The organic spheres are phenolic particles 5-20 microns in diameter and the organic binder is a phenolic or acrylic resin or a mixture of the two or other hardenable resins such as the epoxy condensation product of bisphenol A and epichlorohydrin or silicone types. The metal powders used are W, Mo, Nb, Ni, Au, Mg, Al, Cu, Fe, Pt, Ag, Cu/Sn, Cu/Zn, Cu/Sn/Zn and Ni/Al, with a particle size of 0.044 mm. The mixture is cured at 120-260 DEG C., presintered at 455-650 DEG C., heated at 370-816 DEG C. in air to remove carbon and finally sintered in vacuum or a reducing atmosphere. The sintered body has a density of 15-85% of the solid metal. |
