A kind of refractory material for melting titanium-aluminum alloy and its preparation method

Abstract

The invention relates to a refractory material for smelting titanium-aluminum alloy and a preparation method thereof. The technical scheme is: use 60-75wt% titanium-containing calcium hexaaluminate particles as the aggregate, and 25-40wt% titanium-containing calcium hexaaluminate fine powder as the base material; first add the mixed base material into the bone In the raw material, mix evenly, add 0.5-2wt% binder accounting for the sum of the aggregate and the base material, mix and grind, press and form under the condition of 100-200MPa, and then dry at 110-200°C to obtain titanium-aluminum alloy Refractories for smelting. The particle size of the titanium-containing calcium hexaaluminate particle is 0.088-10 mm, and the particle size of the titanium-containing calcium hexaaluminate fine powder is less than 0.088 mm; the titanium-containing calcium hexaaluminate particle and the titanium-containing calcium hexaaluminate particle are Fine powdered Ca((Al 0.84 Ti 0.16 ) 2 ) 6 o 19 The phase content is greater than 90wt%. The invention has low cost and simple process, and the manufactured product has the characteristics of good high-temperature chemical stability, good thermal shock resistance, strong resistance to titanium-aluminum alloy melt and little pollution to titanium-aluminum alloy.

Description

technical field [0001] The invention belongs to the technical field of titanium-aluminum alloy smelting. Specifically, it relates to a refractory material for smelting titanium-aluminum alloy and a preparation method thereof. Background technique [0002] Titanium-aluminum alloys have low density, high specific strength, high specific stiffness, good heat resistance, excellent high temperature creep resistance and good oxidation resistance. They are the materials of choice for hypersonic aircraft and next-generation advanced aero-engines. Titanium-aluminum alloy melt has high chemical activity at high temperature, and it is easy to react with refractory materials to contaminate the alloy melt. Therefore, the development of refractory materials for titanium-aluminum alloy melting with excellent performance has become one of the important topics in the field. [0003] At present, the commonly used refractory materials for smelting titanium alloys are alumina, calcium oxide, z...

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Problems solved by technology

[0006] 101830715A) patent technology, using 82-92% calcium oxide powder, 5-15% zirconia powder and 1-5% titanium oxide powder as raw materials, prepared CaO refractory material and crucible for titanium alloy melting; Li etc. (Li C H, HeJ, ZhangZ, et al.Preparation of TiFe based alloys melted by CaO crucible and its hydrogen storage properties[J].Journal of Alloys and Compounds,2015,618:679-684.) using cold isostatic pressing A calcium oxide material with a CaO content of 97wt% was prepared; however, the calcium oxide material has poor hydration resistance, which easily leads to oxygenation in the alloy and contaminates the titanium alloy

[0007] Regarding zirconia materials, such as "a zirconia crucible for precision casting and its heat treatment method" (CN109516802 A) patent technology, zirconium powders with different particle sizes are used as raw materials to prepare zirconia crucibles; Chang et al. (ChangYW, Lin C C.Compositional dependence of phase formation mechanisms at the interface between titanium and calcia-stabilized zirconia at 1550℃[J].Journal of the American Ceramic Society,2010,93(11):3893-3901.) with 95mol% zirconia and 5mol% oxide Calcium oxide is used as raw material to prepare titanium-aluminum alloy melting; however, the chemical stability of zirconia material is not good, and it will react with titanium to form a solid solution, which will pollute the alloy.

[0008] Regarding yttrium oxide materials, such as the patented technology of "a preparation method for melting crucibles for titanium and titanium alloys" (CN 101381242A), the main raw materials are yttrium oxide and an appropriate amount of additives, and titanium alloys are prepared by isostatic pressing or casting. Yttrium oxide crucibles for smelting titanium alloys; such as the patented technology of "electrically fused yttrium trioxide ceramic crucibles for melting and casting titanium alloys and its preparation method" (CN106116578B), which uses yttrium oxide and zirconium sheets as the main raw materials and is prepared by electrofusion Fused yttrium trioxide ceramic crucibles for melting and casting of titanium alloys have been developed; however, yttrium oxide materials have poor thermal shock resistance and short service life

[0009] Regarding perovskite materials, such as "BaZrO for titanium alloy melting 3 Preparation method of refractory material and crucible” (CN102503489A) and “A doped Y 2 o 3 BaZrO 3 Refractories" (CN 105777162A) patent technology, using barium carbonate and zirconia as raw materials, prepared BaZrO for titanium alloy melting 3 Refractory materials, however, there are still defects in the chemical stability of perovskite materials, which will cause pollution to titanium-aluminum alloy after smelting, resulting in high oxygen content