| 摘要 |
<p>The ceramic sintered building material having 7 GPa Vicker's hardness and 0.2 micrometer mean surface roughness is manufactured by (a) preparing slag in the weight ratio of 2.5-5.0 calcium oxide and magnesium oxide to 1.0 alumina and silica, (b) pulverizing slag and controlling the particle size in the range of 30-45 wt% 1.0-8.0 mm particles and 15-35 wt% less than 0.1 mm particles, (c) removing iron and dressing slag to include below 1.0 wt% residual iron, (d) hydrating the dressed slag in the weight increment rate of below 1.0 wt%, after treating the dressed slag with the pressure of 2 kg/cm2 for 2 hrs in the autoclave, (e) mixing 60-80 wt% the hydrated slag, 20-40 wt% portland cement including 0.2-4.0 wt% naphthalene sodium sulfonate, and water, (f) molding the mixture in the mold for 48 hrs. and curing the molded body for 72 hrs. in air after releasing the body from the mold.</p> |
