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Fast-degreased feed for injection molding of titanium powder and titanium product of fast-degreased feed

An injection molding and titanium powder technology, applied in the field of titanium powder injection molding feed and its titanium products, can solve the problems of unfavorable industrialized production, poor dimensional accuracy, deformation of degreasing blanks, etc., to avoid powder glue separation, high production efficiency, The effect of improving liquidity

Inactive Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, at present, wax-based binders are generally used as feeding materials for injection molding of titanium and titanium alloys. The use of wax-based binders takes a long time to degrease, and a liquid phase is generated in solvent degreasing, which causes deformation of the degreased billet, and the size after sintering Poor precision, not conducive to industrial production

Method used

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  • Fast-degreased feed for injection molding of titanium powder and titanium product of fast-degreased feed
  • Fast-degreased feed for injection molding of titanium powder and titanium product of fast-degreased feed
  • Fast-degreased feed for injection molding of titanium powder and titanium product of fast-degreased feed

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Embodiment 1

[0037] This embodiment provides a rapid degreasing titanium powder injection molding feedstock and its titanium products, the raw materials of which are composed of titanium powder and a binder.

[0038] The binding agent accounts for 19% of the total mass of the feeding material, and the mass percentages of each component of the binding agent are respectively 0.5% of stearic acid, 0.5% of vinylbisstearamide, 5% of paraffin wax, and 6% of high-density polyethylene , polypropylene 4%, ethylene-vinyl acetate copolymer 2%, polyoxymethylene 82%.

[0039] A preparation method for fast degreasing titanium powder injection molding feed can be realized through the following steps:

[0040] S1. Weigh the titanium powder and activated dispersant, lubricant, framework agent and filler according to the mass ratio, and then add the weighed titanium powder and the components of the binder into the vacuum internal mixer in sequence.

[0041] S2. Adjust the banburying temperature to 170° C.,...

Embodiment 2

[0050] This embodiment provides a rapid degreasing titanium powder injection molding feedstock and its titanium products, the raw materials of which are composed of titanium powder and a binder.

[0051] The binding agent accounts for 19% of the total mass of the feeding material, and the mass percentages of each component of the binding agent are respectively 0.5% of stearic acid, 0.5% of vinylbisstearamide, 3% of paraffin wax, and 5% of high-density polyethylene , polypropylene 4%, ethylene-vinyl acetate copolymer 2%, polyoxymethylene 85%.

[0052] A preparation method for fast degreasing titanium powder injection molding feed can be realized through the following steps:

[0053] S1. Weigh the titanium powder and activated dispersant, lubricant, framework agent and filler according to the mass ratio, and then add the weighed titanium powder and the components of the binder into the vacuum internal mixer in sequence.

[0054] S2. Adjust the banburying temperature to 165°C, a...

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Abstract

The invention discloses a fast-degreased feed for injection molding of titanium powder and a titanium product of the fast-degreased feed. The feed is composed of the titanium powder and a binder, wherein the average particle size of the titanium powder is 10 to 20 [mu]m; and the binder accounts for 10 to 20 percent of the total mass of the feed, and comprises the following components in percentage by mass: 0.5 to 2 percent of an activating dispersant, 1 to 5 percent of a lubricating agent, 5 to 15 percent of a skeleton agent and 80 to 90 percent of a filling agent. The feed for injection molding is obtained by uniformly mixing the activating dispersant, the lubricating agent, the skeleton agent, the filling agent and the titanium powder together according to a certain proportion, and then carrying out granulating or crushing. The catalytic degreasing rate of the feed reaches 73.10 percent within 3 hours and reaches 85.50 percent being close to the theoretical catalytic degreasing rate within 5 hours, thermal degreasing is carried out in the early stage of sintering, and the final degreasing rate is 99.9 percent. A prepared degreased blank has few defects and good shape retention, and is greatly improved compared with a wax-based feed. The finally-sintered titanium product is free of deformation, smooth in surface, free of bumps, high in size precision and surface precision and excellent in mechanical property.

Description

technical field [0001] The invention relates to the technical field of metal injection molding, in particular to a rapid degreasing titanium powder injection molding feed material and titanium products thereof. Background technique [0002] Metal Injection Molding (MIM) is a near-net-shaping process that combines powder metallurgy and plastic injection molding. [0003] By mixing metal powder with a binder, plastic injection molding is used to complete the forming of the part, and finally the desired metal part is prepared through degreasing and sintering. Due to its high material utilization rate and large degree of design freedom, it is suitable for mass production of small and medium-sized complex parts. [0004] Titanium has high specific strength, good mechanical properties, corrosion resistance and biocompatibility, and has very good application scenarios in aerospace, medical equipment, military industry and many other fields. [0005] However, titanium is prone to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/10
CPCB22F3/225B22F3/1025B22F3/1007
Inventor 肖志瑜姚尹城邱耀弘
Owner SOUTH CHINA UNIV OF TECH
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