【摘要】 用传统合成金刚石用的六面顶压机,使用工艺简单的高温焙烧法得到的MgAl2O4纳米粉体,采用超高压烧结法分别在较低温度800-1100℃和较高压强3-5 GPa下尝试进行了纳米透明陶瓷的制备,得到了平均粒径约为50-75 nm的MgAl2O4纳米透明陶瓷,发现烧结陶瓷的最佳温度为1000℃,最佳压力为4 GPa．样品的密度直接决定样品的透明度,粉体的性质对透明度也有很大的影响,透明陶瓷的纳米化使其在光学透过率方面具有独特优势．更多还原

【Abstract】 Using MgAl2O4 nano-powder obtained by unique high-temperature-calcining methods as the raw material, with a six-pressure-source machine which is usually used for diamond synthesis, MgAl2O4 transparent nano-ceramic has been successfully prepared for the first time by ultrahigh pressure sintering at low temperature from 800 to 1100℃under high pressures from 3 to 5 GPa. The mean grain size of the obtained transparent ceramic is from 50 to 75 nm, and the optimal sintering condition should be at the temperature of -1000℃under the pressure of 4 GPa. The transmittance of ceramic is affecteded dominately by its density, also is affected by phase and crystallization of the raw powder, and the grain nanolization of MgAl204 transparent ceramic provides unique advantages to light transmission.更多还原