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The Research of the Zirconia Toughened Corundum-Spine Castables

Author: WangJunTao
Tutor: YuanLin
School: China Building Materials Academy
Course: Materials Science
Keywords: ZrO2 And thermal shock resistance. Spinel Former kilns
CLC: TQ175.73
Type: Master's thesis
Year: 2009
Downloads: 88
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Abstract


Parts of the topic for the new dry process cement rotary kiln before kilns and coal injection Tsui harsh environment of use, and the effect of the use of existing materials is not ideal, research and development of a new type of corundum - spinel castable as large and medium-sized cement kiln kilns and coal injection the Tsui parts of the applicable material, at the same time, further research to improve the thermal shock resistance of corundum - spinel materials by adding ZrO2. In the research work of the present subject, first by adjusting the content of each component in the matrix, to optimize the composition of the matrix, in order to get the best performance. Found in the sample after the high temperature heat treatment process, the matrix of magnesia and Al2O3 micropowder will start at 1100 ℃ spinel formation reaction, this reaction is substantially complete at 1300 ℃ process at 1300 ° C to 1500 ℃ the tip spar grain growth and the completion of the growth. Accordingly, the content of the magnesia will affect the overall performance of the material, the study found 9wt% of the optimum content of the matrix magnesia, then, the sample showed burning after micro-expansion strength and alkali resistance are the best; Meanwhile, in 1 wt% of silica fume added to the matrix, can increase the fluidity of the sample, to promote the sintering of the sample; binding system consisting of magnesia and silica fume, to meet the material in the low, medium and high temperature when the strength and other properties, so , the experiments using non-cement technology and reduce the CaO impact on the performance of the material to use. In order to improve the thermal shock resistance of corundum - spinel materials, the research adding ZrO2 thermal shock resistance. The study found that adding ZrO2 can significantly improve the thermal shock resistance, flexural strength residual sample retention K add 56% to 83%, and other physical and chemical properties to meet the requirements of its mechanism of action: microcrack toughening: ZrO2 martensitic transformation effect; 2. dispersion toughening: ZrO2 as second-phase particles. Finalized Add 6wt% particle size d50 = 300μm ZrO2 the sample thermal shock performance. Also studied the relationship between material modulus of elasticity E and the thermal shock performance, concluded that: the elastic modulus E and the thermal shock resistance is inversely proportional to the gradually decreased with the increase in the number of thermal shock at the same time, the elastic modulus E , the elastic modulus E can be used as the evaluation of this class of materials performance indicators of the thermal shock, while the modulus of elasticity E by the periodic testing of materials to predict and determine whether material failure. Through the study of the subject, has successfully developed a new ZrO2 toughened corundum - spinel castable and industrial production applications, the use of effects in Henan Hongchang cement 4500T / d cement clinker production line is good.

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CLC: > Industrial Technology > Chemical Industry > Silicate > The refractory industry > Refractory > Unshaped refractories
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