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

A method for preparing high-density titanium products by using titanium hydride powder. The titanium hydride powder is used as a raw material. After partial dehydrogenation, it is pressed and formed by conventional mold pressing, and the titanium product is prepared by vacuum sintering. The present invention is by titanium hydride (TiH 2 ) powder is partially dehydrogenated to convert it into unsaturated TiH x (0<X<2) powder, and then use traditional compression molding to obtain not only high-density green body, but also higher green body strength and better surface finish, while using residual TiH 2 / TiH x The reversible alloying effect of hydrogen in the sintering process increases the diffusion rate of titanium atoms at high temperatures, which is conducive to improving the sintering activity of titanium. The synergistic effect of high compact density and good sintering activity helps to obtain high density Density of titanium products, the invention overcomes the problems of poor sintering activity of hydrogenated dehydrogenated titanium powder and difficult forming of hydrogenated titanium powder in the prior art, and provides a simple and feasible method for preparing high-density titanium products in a short process.

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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