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The Research of Corundum-mullite Multiphase Kiln’s Stability of Thermal Shock Resistance and Design Optimization

Author: ZhengJianPing
Tutor: YangHui
School: Zhejiang University
Course: Materials Science
Keywords: Corundum Mullite Composite kiln furniture And thermal shock resistance. Preparation Process Binder Particle size distribution Composition ratio Size
CLC: TQ174
Type: Master's thesis
Year: 2005
Downloads: 309
Quote: 0
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Abstract

Corundum - mullite composite ceramics with high melting point, creep resistance, thermal shock resistance, good oxidation resistance, and abundant raw materials, cost performance characteristics are widely used as a high temperature kiln materials. Domestic corundum - mullite phase kiln furniture products with similar foreign products compared with the poor thermal shock resistance, shorter life shortcomings. Corundum - mullite kiln furniture are mainly concentrated in the recipe, the results obtained by different researchers are quite different, the thermal shock resistance of kiln furniture is not ideal, shorter life. It is necessary to carry out a systematic study of corundum - mullite phase kiln furniture. The paper discusses the types of kiln furniture, kiln forming, the kiln furniture firing method, corundum and mullite Description and characteristics, corundum - mullite kiln furniture with features and development on this basis focuses on the preparation process of corundum - mullite kiln furniture to, binders, particle size distribution, composition ratio of different factors such as corundum - mullite stone complex phase kiln furniture thermal shock resistance, and theoretically explore the the kiln furniture dimensions of design criteria. Draw the following important conclusions: Kiln Furniture preparation process and kiln furniture thermal shock resistance of corundum - mullite phase studies have shown that by changing corundum - mullite kiln furniture to mixing process can greatly improve its thermal shock properties. That in mullite aggregate particles surface first coated with silica powder, alumina mixed corundum - mullite phase better thermal shock resistance than the aggregate particles of mullite kiln furniture, microsilica and direct mixing obtained alumina corundum - mullite phase thermal shock resistance of kiln furniture. Analysis that the first coated layer of the surface of the aggregate particles of mullite microsilica to react with alumina at high temperature synthetic mullite, on the one hand, can improve the porosity of the sample, on the other hand can be reduced due to thermal expansion in the firing process mismatch formation of micro-cracks, thereby enhancing the thermal shock resistance of the sample. Studies have shown that binder prepared as a binding agent to silicone - aluminum plastic corundum - mullite kiln furniture to thermal shock resistance superior to kaolin as a binder prepared corundum - mullite phase kiln furniture thermal shock resistance. Silica - alumina gel as a binding agent of the sample at 1154 ℃ significant formation of mullite and silica - gel aluminum impurity content, the glass phase is generated in the firing process is also less; kaolin as binding The agent samples at 1500 ° C when generated mullite, kaolin contains more impurities in the firing process, prone to the glass phase to reduce the thermal shock resistance. Therefore advised to use silicone - aluminum glue as a corundum - mullite phase Kiln Furniture binder. Study showed that the particle size distribution of corundum - mullite phase thermal shock resistance of kiln furniture relations with the Gang of Zhejiang University, a master's degree thesis jade a mullite phase kiln furniture particles reduced content increase in the content of the particles, the kiln furniture room temperature flexural strength and 1100 ° C for a room temperature water-cooled three times the flexural strength has been increased to 1100 ° C and a room temperature water-cooled three times the flexural strength retention appears to increase a reduced a reduced variation among particles content of 35% and 45% of the time, 1100 ° C for a room temperature of the sample water-cooled three times the flexural strength retention rate of the thermal shock resistance of kiln furniture . Which provide theoretical guidance for the particle size distribution of the kiln furniture design. Y (particles, the percentage of corundum) and corundum mullite kiln furniture to the thermal shock resistance of the relationship between research shows that: when skillfully% lt; Y lt; 3o%, about 60% when the the kiln furniture not only 1100 ° C room temperature water 3 times higher flexural strength and flexural strength retention rate is also higher. Establish a maximum cooling rate of the surface of the kiln materials and Biot modulus the Elementary Functions relationship W (bioF), by numerical fitting bonded corundum a mullite the kiln materials exist an allowable maximum cooling rate V (when the cooling rate exceeds this value, the materials to be destroyed) theoretically proposed the idea of ??the design of kiln furniture dimensions: the two end points of the interval when V gt; 4.8507xlJ3, corundum a mullite stone complex phase kiln furniture reasonable size range of an interval, equation V = W (B) two solutions; reasonable size when V extension 4.8507x10 3:00, corundum a mullite stone complex phase kiln furniture can take any value. Meet these two situations, kiln furniture will not be damaged, and longer service life. The kiln furniture slotted process, the open seam length determination. This paper aims to provide a reference direction of the above problems, in order to further improve the thermal shock resistance of corundum a mullite phase kiln furniture. Key words: corundum, mullite composite kiln furniture, thermal shock resistance, the preparation process, the binder, particle size distribution, composition ratio, size

The Research of Corundum-mullite Multiphase Kiln’s Stability of Thermal Shock Resistance and Design Optimization

Abstract

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