2015高考题氧化钇晶须
abstain Abstract: In this paper, the preparation process, properties and application of yttrium oxide whisker were discusd. Yttrium oxide whisker is a new type of material with excellent performance, which is widely ud in the fields of petroleum, chemical industry, metallurgy, electronics, machinery and other aspects.
Yttrium oxide whisker is a kind of single crystal whisker-like material obtained by using molten alkali metal fluoride flux to extract yttrium from molten yttrium fluoride at high temperature. Yttrium oxide whisker is a monocrystalline rod-shaped whorl with a uniform length, diameter and shape, and the length can reach a thousandth of a millimeter to veral hundred microns. Single crystal whiskers have many characteristics of traditional ceramics, such as high melting point, high hardness, high strength, excellent corrosion resistance and good electrical insulation.十二个月的英文
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asterix>圣彼得堡留学 The preparation process of yttrium oxide whisker is mainly divided into four steps: suitable raw materials, smelting and filtration, lection of flux, and extraction. The blank is f
irst ground into powder with a particle size of -325 mesh. The ratio of yttrium oxide and flux is usually 20:80. The molten yttrium oxide is then filtered and the slag is decanted. Finally, the slag is extracted from the molten alkali metal fluoride.
The properties of yttrium oxide whisker are mainly high strength, high hardness, high temperature oxidation resistance, creep resistance and good thermal shock resistance. The hardness of yttrium oxide whisker is about 1500HV, which is much higher than that of general ceramics. Its strength can reach more than 300MPa, which is much higher than that of steel and aluminum alloy. Yttrium oxide whisker also has good corrosion resistance, and its corroded alkali metal fluoride has no effect on its shape and structure.
仍然的拼音 Yttrium oxide whisker is widely ud in many fields. In the petroleum industry, it is ud as drilling tools and aling materials. In the chemical industry, it is ud as a catalyst for the reaction of various chemicals. In the field of metallurgy, it is ud to produce various wear-resistant parts and tools. In the field of electronics, it is ud to make various miconductor components. In the machinery industry, it is ud to make bearings, als, turbine blades and other components.
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上海华尔街英语 In conclusion, yttrium oxide whisker is a new type of material with excellent physical and chemical properties, which has broad application prospects. With the deepening of rearch, its application range will become wider and wider, and will bring great development to the related industries.。
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