| 摘要 |
<p>PURPOSE:To obtain a porous sintered body having uniform pore size and pore distribution, excellent strength and thermal shock resistance and used as a furnace material, a setter material, a sheath material or a heat insulating material. CONSTITUTION:The surfaces of hollow siliceous spheres are coated with fine magnesia particles, the coated spheres are press-molded and the resulting molded body is heated at 150-300 deg.C/hr heating rate and sintered at 1,100-1,400 deg.C. Balloons of fly ash, silica or pumiceous sand may be used as the hollow siliceous shperes and the average particle diameter of the fine magnesia particles is <=1/10 of that of the hollow siliceous spheres. The amt. of the spheres is 30-60vol.% of the total amt. of the particles and the spheres.</p> |
