(武漢科技大學(xué) 高溫陶瓷與耐火材料湖北省重點(diǎn)實(shí)驗(yàn)室，
武漢 430081)
摘 要: 以鋁熱還原法合成了MgAl2O4/W復(fù)合材料。 研究結(jié)果表明： 通過調(diào)整氧化鎂的含量可以獲得含富鋁尖晶石或富鎂尖晶石與金屬鎢的復(fù)合材料。 其中富鋁尖晶石晶體發(fā)育完整， 氧化鋁含量大于80％。 金屬鎢主要以等軸晶存在， 約1～8μm。 隨氧化鎂含量的增加， 尖晶石的晶格常數(shù)逐漸變大。 富鋁尖晶石和富鎂尖晶石具有不同的生長(zhǎng)機(jī)理。
關(guān)鍵字: 鋁熱反應(yīng)； 熱膨脹系數(shù)； 固溶體； 晶格常數(shù)
（Hubei Province Key Laboratory of Ceramic and Refractory,
Wuhan University of Science and Technology,
Wuhan 430081, China）
Abstract: MgAl2O4/W composites were fabricated from mixture powder of WO3 and Al by aluminothermic reducing method. The results show that the composite containing alumina rich spinel or magnesium rich spinel can be obtained by adjust the ratio of the raw material. In the composite tungsten is equiaxed crystal with the size of about 1～8μm, and well crystallized alumina rich spinel has more than 80% Al2O4 -content. The lattice constant of MgAl2O4 increases with the increment of MgO content. The alumina rich spinel and magnesium rich spinel have different growth mechanisms.
Key words: aluminothermic reaction; thermal expansion coefficient; solid solution; lattice constant
