Method for manufacturing titanium and titanium alloy powder metallurgy special-shaped pieces
A powder metallurgy and titanium alloy technology, applied in the field of material processing, can solve the problems of high forming pressure, difficult inspection and discovery, and difficult process control of heating rate, and achieve the effect of uniform density
Inactive Publication Date: 2012-04-11
李宝干
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Problems solved by technology
Due to the advantages of stable physical and chemical properties, high specific strength and strong corrosion resistance of titanium and titanium alloy materials, currently only ingots, plates, pipes, rods and cast products, titanium and titanium alloy powders are available in China. The products are only used in some alloy additives and fireworks and firecrackers industries, far from meeting special requirements for special-shaped products. For titanium and titanium alloy powder special-shaped products, vacuum casting can only be used, which has high production costs and low yields. The most important thing is: There are many pores inside the special-shaped parts, which are not easy to be found by inspection, which makes it difficult to guarantee the quality of the cast special-shaped parts. This is a technical problem that cannot be safely solved for the cast special-shaped products.
There are several difficulties in the production process of metallurgical products of metal powder: one is that titanium metal is an active metal, and it is easy to combine with interstitial elements in the process of powder preparation, which will cause spontaneous combustion; second, titanium and titanium alloy powder It is produced by oxidation, ball milling and sieving processes, so the particle size and shape of the powder are relatively regular, which causes great difficulties for the compression molding of special-shaped parts, and the required molding pressure is very high. The general oil isostatic press is up to Less than the requirements; Third, the process control of the heating rate of vacuum sintering and the final holding temperature is difficult
The above aspects limit the development of titanium and titanium alloy powder metallurgy special-shaped products, so it is necessary to improve
Method used
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Embodiment Construction
[0020] Embodiments of the present invention are described below.
[0021] A method for preparing titanium and titanium alloy powder metallurgy special-shaped parts, comprising the following steps:
[0022] 1) Select the raw material, titanium sponge or titanium alloy;
[0023] 2) Put titanium sponge or titanium alloy into a vacuum of 10x10 -2 Heating to 550°C in a Pa vacuum sintering furnace, injecting hydrogen, and hydrogenating for 3 hours to cause hydrogen embrittlement of the sponge titanium or titanium alloy, and cooling to 60°C with the furnace;
[0024] 3) Put the hydrogenated titanium sponge or titanium alloy into a ball mill tank, and perform ball milling under the protection of argon, the ball mill speed is 290r / min, and the ball milling time is 25-32 hours;
[0025] 4) The ball mill powder is screened by vibration and divided into various particle sizes of 80-300 mesh;
[0026] 5) Use rubber to make rubber soft molds for various special-shaped parts with differen...
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The invention provides a method for manufacturing titanium and titanium alloy powder metallurgy special-shaped pieces, which comprises the following steps of: selecting raw materials; hydrogenating; ball milling; making rubber soft moulds; placing powders into the rubber soft moulds; die casting by cold isostatic pressing; and vacuum sintering. Using the manufacturing method, the problem on low density and internal porosity in the special-shaped piece products can be solved, and the physical and chemical performances of the special-shaped piece products are improved.
Description
technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a method for preparing titanium and titanium alloy powder metallurgy special-shaped parts. Background technique [0002] Titanium and titanium alloy materials have the characteristics of high strength and strong corrosion resistance, and are widely used in many fields such as aviation, aerospace, chemical industry, machinery, and salt production at home and abroad, and are expanding their application fields in domestic civil use. Due to the advantages of stable physical and chemical properties, high specific strength and strong corrosion resistance of titanium and titanium alloy materials, currently only ingots, plates, pipes, rods and cast products, titanium and titanium alloy powders are available in China. The products are only used in some alloy additives and fireworks and firecrackers industries, far from meeting special requirements for special-shape...
Claims
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IPC IPC(8): B22F9/04B22F3/16B22F3/04
Inventor 李宝干李军涛
Owner 李宝干