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A method for preparing titanium nitride bulk with controllable composition

A titanium nitride and system technology, which is applied in the field of preparation of titanium nitride blocks with controllable composition, can solve the problems affecting the airworthiness certification of civil aircraft engines, lack of airworthiness certification, etc., and solve the problem of uncontrollable titanium nitride composition, Abundant preparation methods, uniform effect of ingredients

Active Publication Date: 2021-03-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the end of the 20th century, foreign countries have carried out theoretical research on the probabilistic risk assessment of titanium nitride inclusions. In recent years, China has also stipulated in airworthiness treaties to improve the risk assessment of titanium nitride inclusions. The premise of this research work is to obtain different nitrogen contents. At present, only titanium nitride powder can be prepared in China, and the nitrogen content is 20%, while the nitrogen content of the naturally formed titanium nitride in titanium alloy is within 12%, which lacks airworthiness certification. Titanium nitride blocks with different nitrogen contents become a key issue affecting the airworthiness certification of civil aeroengines

Method used

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  • A method for preparing titanium nitride bulk with controllable composition
  • A method for preparing titanium nitride bulk with controllable composition
  • A method for preparing titanium nitride bulk with controllable composition

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Embodiment 1

[0029] In this embodiment, the preparation method of a titanium nitride block with a nitrogen content of 2wt% comprises the following steps:

[0030] (1) select titanium alloy (brand is Ti-6Al-4V) powder and nitrogen content to be the industrial titanium nitride powder of 20% (wt), the granularity of two kinds of powders is 30 microns;

[0031] (2) According to titanium nitride with a nitrogen content of 2wt%, the weight ratio of titanium alloy powder to industrial titanium nitride powder is 9:1, and the two powders in the above ratio are weighed and mixed evenly, and then mixed evenly by cold pressing process The powder is compressed into blocks;

[0032] (3) placing the compressed block mixture in a high-vacuum Ar atmosphere protection non-consumable electric arc furnace;

[0033] (4) Before smelting, vacuumize the furnace to 3×10 -4 Pa, after flushing the furnace with argon for 3 times, vacuumize to 3×10 -4 Pa, refill with argon to -0.03MPa (the reading of the vacuum gau...

Embodiment 2

[0037] In this embodiment, the method for preparing a titanium nitride block with a nitrogen content of 4wt% comprises the following steps:

[0038] (1) select titanium alloy (brand is Ti-6Al-4V) powder and nitrogen content to be the industrial titanium nitride powder of 20% (wt), the particle size of two kinds of powders is 20 microns;

[0039] (2) According to titanium nitride with a nitrogen content of 4wt%, the weight ratio of titanium alloy powder to industrial titanium nitride powder is 4:1, and the two powders in the above ratio are weighed and mixed evenly, and then mixed evenly by cold pressing process The powder is compressed into blocks;

[0040] (3) placing the compressed block mixture in a high-vacuum Ar atmosphere protection non-consumable electric arc furnace;

[0041] (4) Before smelting, vacuumize the furnace to 1×10 -4 Pa, after flushing the furnace with argon for 2 times, vacuumize to 1×10 -4 Pa, refill with argon to -0.025MPa (the reading of the vacuum g...

Embodiment 3

[0045] In this embodiment, the method for preparing a titanium nitride block with a nitrogen content of 8 wt% includes the following steps:

[0046] (1) select titanium alloy (brand is Ti-6Al-4V) powder and nitrogen content to be the industrial titanium nitride powder of 20% (wt), the granularity of two kinds of powders is 10 microns;

[0047] (2) According to titanium nitride with a nitrogen content of 8wt%, the weight ratio of titanium alloy powder to industrial titanium nitride powder is 3:2. Weigh the two powders in the above ratio and mix them evenly, and then use cold pressing process to mix them evenly The powder is compressed into blocks;

[0048] (3) placing the compressed block mixture in a high-vacuum Ar atmosphere protection non-consumable electric arc furnace;

[0049] (4) Before smelting, vacuumize the furnace to 5×10 -4 Pa, after flushing the furnace with argon for 4 times, vacuumize to 5×10 -4 Pa, refill with argon to -0.02MPa (the reading of the vacuum gaug...

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Abstract

The invention belongs to the technical field of titanium nitride preparation, and particularly relates to a method for preparing a titanium nitride block with controllable composition. The method comprises the following steps of (1) preparing pure titanium powder and titanium nitride powder according to titanium nitride compositions; (2) uniformly mixing the two powders according to a certain proportion, and pressing the powders into blocks through a cold pressing process; and (3) placing the block obtained in the previous step in a vacuum non-consumable smelting furnace, controlling smeltingcurrent to melt the block, cooling and solidifying to obtain a titanium nitride block. The titanium nitride produced by the method is uniform in component, and the nitrogen content in the titanium nitride can be accurately controlled.

Description

technical field [0001] The invention belongs to the technical field of titanium nitride preparation, and in particular relates to a method for preparing a titanium nitride block with controllable composition. Background technique [0002] Titanium alloy is a metal material widely used in the aviation field. However, titanium alloy is extremely active at high temperature, and it is easy to react with nitrogen in the air to form titanium nitride (hard α inclusions). The brittleness and hardness of hard α inclusions are very large. , basically has no plastic deformation ability, and has adverse effects on the processing and use of titanium materials. During the forging and follow-up of titanium ingots, the areas with hard α inclusions are easily crushed during the deformation process, forming defects such as cracks and cavities, which in turn cause component failures and seriously threaten flight safety in the aviation field. According to the FAA report of the US Federal Aviat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/02C22C14/00C22C29/00C22C29/16C22C32/00
CPCC22C1/1036C22C14/00C22C29/005C22C29/16C22C32/0068
Inventor 吉海宾蔡雨升雷家峰杨锐单晓明郭小军
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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