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Study of Mould Materials and Preparation Technology of Titanium Alloy Investment Casting

Author: YaoZhuo
Tutor: ZhaoChengZhi
School: Harbin Engineering University
Course: Materials Processing Engineering
Keywords: Titanium Shell material Bimodal size distribution Compound additives Interfacial reaction
CLC: TG249.5
Type: Master's thesis
Year: 2011
Downloads: 126
Quote: 0
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Titanium metal is an excellent material, but high activity at high temperatures, almost all of the refractory react. Is a commonly used titanium alloy precision casting molding method, but the most common modeling materials will react with the molten alloy to generate oxygen \In this paper, the actual production conditions and modeling materials based compound additives added and refractories bimodal improved graded. After a series of experiments, the final casting titanium alloy castings and assess improvement effect. This choice calcium oxide stabilized zirconia particle size was 47μm and 10μm do bimodal size distribution, binder selected industrial applications wider sol, composite additives PVA30% latex 70% of the total volume of 1% The remaining amount of additives, these raw materials are stirred into a slurry made of size 40 × 20 × 6 (± 0.5) mm in shell test block, and the general process (only one size of refractory powder, did not add the composite additives) do comparison test block, respectively, for surface morphology observation and flexural strength, drying rate, permeability and thermal and chemical stability of the test series. According to the experimental results, the combination of two optimization methods blades made of shell and vacuum melting and casting, the casting analysis, evaluation optimization results. By bending strength tests can determine: shell gradation can improve strength and residual strength at room temperature, so temperature strength compound additives added to further improve the residual strength decreases; composite additive to be added can make shell completely drying time is much shorter in After calcination leaving because of polymer dispersed LOI tiny hollow shell helps to improve permeability; through the preparation of a bimodal class of smooth dense surface shell of liquid titanium thermochemical stability improved. Through the process improved pouring out of the titanium castings for observation and analysis: macro casting surface is smooth, no obvious defects or cracks; interfacial reaction occurs in varying degrees in different regions; reaction products are mainly light-colored titanium silicon compound, located at the interface grain boundary, mainly due to the type of shell material in the sol; the casting shell and the contact interface of a certain amount of oxygen, but did not form a clear \lattice gap, but not enough to affect the casting properties of the formation of \Showed bimodal size distribution and composite additive to be added to reduce the titanium shell and the interface between the degree of response, improved shell castings and surface quality.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Casting > Special Casting > Precision Casting
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