Nitride composite refractory material for titanium alloy smelting and preparation method thereof

A technology of refractory materials and nitrides, which is applied in the field of nitride composite refractory materials for titanium alloy smelting and its preparation, can solve the problems of no patents and literature reports, unavailable refractory materials, difficulties in the preparation of single crucibles, etc., and achieve excellent Anti-corrosion performance of titanium melt, low oxygen content, and compact structure

Pending Publication Date: 2022-06-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrides face bottlenecks such as high cost or difficult sintering, which severely limits the application of nitrides as refractory materials for titanium alloy melting.
Among them, aluminum nitride has the advantages of high thermal conductivity, low thermal expansion coefficient, corrosion resistance, high strength, and thermal shock resistance. However, it has the problems of high cost and difficulty in the preparation of a single crucible; while boron nitride is low in cost and chemically stable. Good resistance, excellent melt corrosion resistance, good self-lubrication, but the disadvantages are insufficient strength, poor melt impact resistance, and difficult sintering
If the advantages of both aluminum nitride and boron nitride can be combined, such as the high strength and excellent corrosion resistance of aluminum nitride and the low cost and excellent thermal stability of boron nitride, the development of boron nitride / nitride for titanium alloy melting The preparation technology of aluminum alloy composite refractories will greatly improve the performance of current refractories, reduce costs, and reduce or avoid pollution problems in the smelting process of titanium alloys, but so far no relevant patents and literature reports have been found
Moreover, it is still impossible to obtain refractory materials with better performance only by combining aluminum nitride and boron nitride or by combining aluminum nitride and boron nitride arbitrarily.

Method used

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  • Nitride composite refractory material for titanium alloy smelting and preparation method thereof
  • Nitride composite refractory material for titanium alloy smelting and preparation method thereof
  • Nitride composite refractory material for titanium alloy smelting and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A nitride composite refractory material for smelting titanium alloy, according to the mass percentage of components, its main components are: boron nitride powder 20%, aluminum nitride powder 80%; The additive is yttrium oxide; the particle size of the boron nitride powder is 1 to 3 μm (boron nitride is used as a composite active agent, in order to promote the sintering and compactness of the composite material, so its particle size should be ≤ the particle size of aluminum nitride), and the aluminum nitride powder has a particle size of 1 to 3 μm. The particle size is 3-5 μm; the purity of the boron nitride powder is greater than 99.5%, and the purity of the aluminum nitride powder is greater than 99.9%.

[0034] The preparation method of the nitride composite refractory material for titanium alloy smelting comprises the following steps:

[0035] ①Preparation of composite refractory powder: After weighing all the raw materials according to the mass percentage of the co...

Embodiment 2

[0044] A nitride composite refractory material for smelting titanium alloy, according to the mass percentage of components, its main components are: boron nitride powder 10%, aluminum nitride powder 90%; Other component conditions and preparation conditions are the same as in Example 1.

[0045] The composite refractory prepared in this example has a relatively uniform structure and high density, see Figure 4 , after testing: the finished product density of composite refractory is 2.7428g / cm 3 , its theoretical density is 3.1275g / cm 3 , the relative density reaches 87.7%.

[0046] The composite refractory prepared in this example is relatively stable in quality and excellent in corrosion resistance. It is applied in a vacuum melting furnace to smelt titanium-aluminum alloy (Ti-48Al, at% ), after testing: the surface of the composite refractory after smelting is relatively flat and not significantly corroded by the titanium melt, see Figure 5 ; The interface reaction laye...

Embodiment 3

[0049] A nitride composite refractory material for smelting titanium alloy, according to the mass percentage of components, its main components are: boron nitride powder 40%, aluminum nitride powder 60%; Other component conditions and preparation conditions are the same as in Example 1.

[0050] The composite refractory prepared in this example has a relatively uniform structure and high density. After testing, the finished product density of the composite refractory is 2.3891g / cm 3 , its theoretical density is 2.7877g / cm 3 , the relative density reaches 85.7%.

[0051] The composite refractory prepared in this example is relatively stable in quality and excellent in corrosion resistance. It is applied in a vacuum melting furnace to smelt titanium-aluminum alloy (Ti-48Al, at% ), after testing: the surface of the composite refractory after smelting is relatively flat, not significantly eroded by the titanium melt, the refractory-titanium-aluminum alloy interface reaction laye...

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Abstract

The invention belongs to the technical field of titanium alloy smelting, and discloses a nitride composite refractory material for titanium alloy smelting and a preparation method thereof. The nitride composite refractory material for titanium alloy smelting is prepared from the following components in percentage by mass: 10-40% of boron nitride powder, 60-90% of aluminum nitride powder and the balance of additives, the addition amount of the additive is 3-6% of the total mass of the boron nitride and the aluminum nitride; the additive is yttrium oxide. The invention also discloses a preparation method of the nitride composite refractory material. The composite refractory material is prepared by adopting a powder metallurgy technology. The refractory material disclosed by the invention has high density, high corrosion resistance, thermal shock resistance and excellent high-temperature chemical inertness, hardly reacts with a titanium alloy melt, is simple in preparation process and low in cost, and can be used for smelting low-energy-consumption and high-quality titanium alloy.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy smelting, and particularly relates to a nitride composite refractory material for titanium alloy smelting and a preparation method thereof. Background technique [0002] Titanium alloys have the advantages of light weight, high strength, good toughness, and excellent corrosion resistance, and are widely used in aerospace, automotive industry, biomedical components, marine engineering and other fields. However, titanium alloys have high melting points and high chemical activity in the molten state, and are prone to chemical reactions with refractory materials such as crucibles, molds, and shells for melting, resulting in titanium alloy pollution. For a long time, the high-efficiency, low-consumption, and high-clean preparation process of titanium alloys has been a hot and difficult issue in the titanium industry. Developing new refractory materials for smelting and obtaining crucibles or sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/582C04B35/66C04B35/622C22C14/00C22C1/02
CPCC04B35/581C04B35/66C04B35/622C22C1/02C22C14/00C04B2235/386C04B2235/3225C04B2235/77C04B2235/3222
Inventor 王智张生庭张卫文杨超
Owner SOUTH CHINA UNIV OF TECH
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