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Method for preparing high-compactness titanium product by virtue of titanium hydride powder

A titanium hydride powder and densification technology, which is applied in the field of powder metallurgy, can solve the problems of reducing product performance, high brittleness of titanium hydride, increasing process flow, etc., and achieves the effects of improving sintering activity, increasing diffusion rate, and high compact density

Inactive Publication Date: 2017-08-11
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high brittleness of titanium hydride, it is difficult to press into shape by molding process. Usually, it is necessary to add a high volume content of forming agent to obtain a certain shape of green body.
The removal of the forming agent not only further increases the process flow, but also interstitial elements such as C, H, and O are also likely to cause product contamination, thereby reducing product performance
Therefore, it has been difficult for titanium hydride powder to be widely used in powder metallurgy titanium alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Commercially available titanium hydride powder (average particle size ≤ 75 μm) is used as raw material, placed in an alumina sintering boat, then placed in a vacuum sintering furnace, and vacuumed until the vacuum degree is lower than 1×10 -3 Pa, raise the furnace temperature to 650°C at a heating rate of 5°C, keep the temperature for 1 minute, and cool down with the furnace to obtain unsaturated titanium hydride powder. The unsaturated titanium hydride powder obtained by partial dehydrogenation is 3.66% lighter than the original titanium hydride powder. The unsaturated titanium hydride powder is pressed and formed under a pressure of 600 MPa by molding, and the formed compact is placed in a vacuum sintering furnace, and the vacuum is evacuated until the vacuum degree is lower than 1×10 -3 Pa, at a heating rate of 5°C / min, sintered at 1350°C for 2h, and cooled with the furnace to obtain a titanium product with a density of 98.0%.

Embodiment 2

[0017] Commercially available titanium hydride powder (average particle size ≤ 75 μm) is used as raw material, placed in an alumina sintering boat, then placed in a vacuum sintering furnace, and vacuumed until the vacuum degree is lower than 1×10 -3 Pa, raise the furnace temperature to 630°C at a heating rate of 5°C, keep the temperature for 2 minutes, and cool down with the furnace to obtain unsaturated titanium hydride powder. The unsaturated titanium hydride powder obtained by partial dehydrogenation is 2.87% lighter than the original titanium hydride powder. The unsaturated titanium hydride powder is pressed and formed under a pressure of 600 MPa by molding, and the formed compact is placed in a vacuum sintering furnace, and the vacuum is evacuated until the vacuum degree is lower than 1×10 -3 Pa, at a heating rate of 5°C / min, sinter at 1250°C for 2h, and cool with the furnace to obtain a titanium product with a density of 98.5%.

Embodiment 3

[0019] Commercially available titanium hydride powder (average particle size ≤ 75 μm) is used as raw material, placed in an alumina sintering boat, then placed in a vacuum sintering furnace, and vacuumed until the vacuum degree is lower than 1×10 -3 Pa, raise the furnace temperature to 620°C at a heating rate of 10°C, keep the temperature for 3 minutes, and cool down with the furnace to obtain unsaturated titanium hydride powder. The unsaturated titanium hydride powder obtained by partial dehydrogenation is 2.07% lighter than the original titanium hydride powder. The unsaturated titanium hydride powder is pressed and formed under a pressure of 600 MPa by molding, and the formed compact is placed in a vacuum sintering furnace, and the vacuum is evacuated until the vacuum degree is lower than 1×10 -3 Pa, at a heating rate of 5°C / min, sinter at 1300°C for 3 hours, and cool down with the furnace to obtain a titanium product with a density of 98.2%.

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Abstract

The invention discloses a method for preparing a high-compactness titanium product by virtue of a titanium hydride powder. The method comprises the following steps: taking the titanium hydride powder as a raw material, carrying out partial dehydrogenation, then carrying out pressing formation through common die-pressing, and preparing the titanium product through vacuum sintering. According to the method disclosed by the invention, a titanium hydride (TiH2) powder is transformed into an unsaturated TiHx (X is greater than 0 and less than 2) powder trough the partial dehydrogenation treatment, and then traditional die-pressing formation is adopted, so that a high-compactness green blank can be obtained, and high green blank strength and high surface smoothness can be obtained; and meanwhile, the diffusion speed of titanium atoms is increased at a high temperature by virtue of the reversible alloying effect of hydrogen of residual TiH2 / TiHx during a sintering process, so that improvement for the sintering activity of titanium is benefited, and preparation for the high-compactness titanium product is promoted due to the synergistic effect of the high green blank compactness and the high sintering activity. The invention overcomes the problems of low sintering activity of a hydrogenated-dehydrogenated titanium powder and difficult formation of a titanium hydride powder in the prior art, and provides a simple and feasible method for preparing a high-compactness titanium product in a short flow.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a method for preparing high-density titanium products by using titanium hydride powder. Background technique [0002] Metal titanium and its alloys have the characteristics of high specific strength, strong corrosion resistance, and excellent high-temperature performance, and are widely used in the fields of aviation, aerospace, weapons, and automobile industries. However, the conventional smelting and casting method has a long process route, low material utilization rate, and poor cold working performance of titanium, resulting in high production costs of titanium materials, which limits the further application of titanium and titanium alloys. [0003] Powder metallurgy has a series of advantages in the manufacture of parts, such as fine and uniform structure, controllable composition, and saving raw materials. It is one of the ideal processes for manufacturing low-cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04
CPCC22C1/0458
Inventor 陈峰闫志巧
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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