Gel mould-injecting formation method of porous titanium with various shape

A technology of gel injection molding and complex shapes, which is applied in the field of powder metallurgy molding, which can solve the problems of difficult to obtain porous materials, high cost, and low porosity, and achieve uniform macroscopic distribution of pores, high-efficiency production, and high porosity. Effect

Inactive Publication Date: 2008-04-23
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Among them, the production process of porous titanium prepared by powder metallurgy is simple, low cost and can obtain porous titanium with uniform structure, but it is difficult to obtain complex shape parts, and the porosity is low; fiber metallurgy can produce high-quality porous metal fibers material, but the size of the product is limited and the cost is high; the slurry foaming method can obtain higher porosity, but the disadvantage is that it is difficult to control the size of the bubbles, so it is difficult to obtain a uniform porous material; self-propagating high-temperature synthesis has developed very rapidly in the past 20 years The new material preparation technology can be used to prepare intermetallic compounds and composite materials, but the self-propagating high-temperature synthesis process can only prepare porous titanium alloy products with limited components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The raw material of titanium powder is commercially available 50-100 μm titanium powder; acrylamide is produced by Tianjin Chemical Reagent Research Institute, which is a white fine crystal; N, N-methylenebisacrylamide is produced by Tianjin Kemiou Chemical Reagent Development Center, It is white powder.

[0017] Dissolve 15 grams of acrylamide and 1 gram of N,N-methylenebisacrylamide in 100 ml of water, add 450 grams of titanium powder and 5 grams of polyacrylic acid dispersant, and vacuum defoam for 30 minutes after ball milling to obtain a solid phase The slurry with a volume fraction of 50% is injected into the metal mold, and the mold is moved into an 80°C thermostat for 120 minutes. After demoulding, it is vacuum-dried for 72 hours to obtain the green body of the gel injection molded porous titanium part; the green body is sintered Get porous titanium parts.

[0018] The gel injection molded porous titanium parts prepared by this process had a porosity of 43.2% a...

Embodiment 2

[0020] The raw material of titanium powder is commercially available 50-100 μm titanium powder; acrylamide is produced by Tianjin Chemical Reagent Research Institute, which is a white fine crystal; N,N-methylenebisacrylamide is produced by Tianjin Kemiou Chemical Reagent Development Center, It is white powder.

[0021] Dissolve 20 grams of acrylamide and 6 grams of N,N-methylenebisacrylamide into 100 ml of water to make a solution, add 300 grams of titanium powder and 10 grams of polyacrylamide dispersant, and vacuum defoam for 20 minutes after ball milling for 24 hours , to prepare a slurry with a solid phase volume fraction of 40%. The resulting slurry is poured into a glass mold and kept at 60°C for 120 minutes. The slurry in the mold is solidified into a green body. After demoulding, it is vacuum-dried for 48 hours to obtain a gel-cast porous titanium part green body; the green body is sintered Get porous titanium parts.

[0022] The gel injection molded porous titanium ...

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Abstract

An injection moulding method for preparing porous Ti with complex shape includes such steps as dissolving acrylamide and N,N-methyleno biacrylamide as cross-linking agent in solvent, adding Ti powder to make them be suspended in the solution, adding trigger and catalyst, injecting the slurry into non-porous mould, cross-linking and polymerizing to become 3D recticular polymer gel while in-situ adhering the particles, and solidifying. Its advantages are high porosity, high rate of open pores and uniform distribution of pores.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy molding, and in particular provides a gel injection molding method of complex-shaped porous titanium. Background technique [0002] Among metal porous materials, porous titanium is widely used in aviation, aerospace and other military industries, as well as chemical, metallurgical, Light industry, medicine and other civilian sectors. The preparation methods of porous titanium include powder metallurgy, fiber metallurgy, slurry foaming, self-propagating high-temperature synthesis, etc. Among them, the production process of porous titanium prepared by powder metallurgy is simple, low cost and can obtain porous titanium with uniform structure, but it is difficult to obtain complex shape parts, and the porosity is low; fiber metallurgy can produce high-quality porous metal fibers material, but the size of the product is limited and the cost is high; the slurry foaming method can obtain hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22
Inventor 郭志猛李艳隋延力郝俊杰
Owner UNIV OF SCI & TECH BEIJING
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