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本文在国产六面顶高温高压设备上成功制备出具有超高硬度和良好导电特性的二硼化镁(MgB2)聚晶体材料。样品制备的压力和温度条件分别为5.5GPa和700~1000℃。光学显微镜观测表明,合成样品具有褐色金属光泽。通过X射线衍射对合成样品进行了晶体结构的表征。X射线衍射谱表明,二硼化镁晶体具有典型的六角结构,空间群为P6/mmm(191)。晶格常数为,a=0.308nm,c=0.352nm。常态下,合成样品的显微硬度、体密度和电阻率分别被测量。其显微硬度为4109.5 kgf/mm2,常态下电导率为2.42×10-6Ωm。这些特性决定着硼化镁聚晶有着潜在的应用价值。
In this paper, magnesium diboride (MgB2) polycrystalline material with ultra-high hardness and good electrical conductivity has been successfully prepared on domestic six-top high-temperature and high-pressure equipment. The sample preparation pressure and temperature conditions were 5.5 GPa and 700-1000 ° C, respectively. Optical microscopic observations showed that the synthetic samples had a brown metallic luster. The synthesized samples were characterized by X - ray diffraction. X-ray diffraction spectrum shows that the crystal of magnesium diboride has a typical hexagonal structure with a space group of P6 / mmm (191). The lattice constant is, a = 0.308 nm, c = 0.352 nm. Under normal conditions, the microhardness, bulk density and resistivity of the synthesized samples were measured. Its microhardness is 4109.5 kgf / mm2, its conductivity is 2.42 × 10-6Ωm under normal conditions. These characteristics determine the potential application value of magnesium polycrystal.