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Reaction sintering study prepared porous TiB_2-TiC composite ceramics

Author: XieJiFeng
Tutor: CaoShunHua
School: Central South University
Course: Powder Materials Science and Engineering
Keywords: Reaction sintering In situ synthesis Porous composite ceramics TiB2-TiC
CLC: TQ174.65
Type: Master's thesis
Year: 2009
Downloads: 23
Quote: 0
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Abstract


Based composite TiB2-TiC ceramic material has a high melting point, high hardness, high thermal conductivity, low thermal expansion coefficient, high wear resistance and good electrical conductivity characteristics, such material has a good prospect of application in the area of ​​high-temperature filter, so as to carry out of such materials, in particular using in situ synthesis techniques to prepare the material has a certain innovative. Vacuum sintering conditions, the use of in situ synthesis reaction sintering technology, Ti, B4C and carbon black as raw materials, preparation of porous TiB2-TiC composite ceramic materials. The raw material particle size ratio of raw materials, the sintering temperature of the impact on of porous TiB2-TiC composite ceramics sintered performance, pore structure and mechanical properties. 1.3Ti-B4C system of the sintered samples in sintering temperature below 1300 ° C the TiB and T13B4 intermediate transition phase, when the sintering temperature is higher than 1300 ° C, the more pure product of the material prepared by reaction sintering, the intermediate phase disappears, the sintered samples containing only TiB2 and TiC two-phase. TiB2-TiC composite ceramic materials. Reaction in situ synthesis of porous sintered connected pores and more uniform pore distribution, pore size distribution of a narrow range. Part of the fracture surface of the sintered samples is relatively flat performance for the transgranular fracture; another part of the surface is uneven showed intergranular fracture. In general, the fracture mode of the porous TiB2-TiC composite ceramic materials both intergranular fracture and to mixed transgranular fracture fracture mode. 3 the size of the raw material particles have a major impact on the sintered density of the sample, the pore size and mechanical properties. For the same system, the high sintering temperature of the sintered samples with high density, three-point bending strength and a low pore size. 3Ti-B4C sintered samples under the same sintering temperature, density and flexural strength were higher than 4Ti-B4C-C system, relative permeability and maximum aperture value is below the 4Ti-B4C-C system. The results showed that the the B4C powder particle size directly affect the performance of the prepared material. Ti-BC ternary equilibrium phase diagram and thermodynamic data for ternary Ti-BC known under 1700 ℃, the thermodynamic data of unknown compounds in the system were estimated. Each group the chemical potential in the same time according to the thermodynamically stable phase equilibrium conditions, in a stable state of Ti-BC ternary calculated. Accordingly, the analysis of Ti and B4C reaction formation of porous TiB2-TiC composite ceramics reaction diffusion path: Ti/TiC/TiB/Ti3B4/TiB2/B4C.

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CLC: > Industrial Technology > Chemical Industry > Silicate > Ceramic Industry > Production process and equipment > Firing and equipment
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