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Aqueous molding compositions for powders of stainless steel, intermetallic compound and/or metal matrix composites

An intermetallic compound, stainless steel technology, applied in metal processing equipment, transportation and packaging, etc., can solve problems such as cumbersome roasting procedures and difficult parts

Inactive Publication Date: 2001-09-05
RUTGERS THE STATE UNIV OF NEW JERSEY (US)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the use of the support powder to maintain the shape of the billet, it is still difficult to form parts of complex shapes using wax-based systems, because in most cases tedious firing procedures are required, which can potentially lead to cracking of the part. it will take several days

Method used

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  • Aqueous molding compositions for powders of stainless steel, intermetallic compound and/or metal matrix composites
  • Aqueous molding compositions for powders of stainless steel, intermetallic compound and/or metal matrix composites
  • Aqueous molding compositions for powders of stainless steel, intermetallic compound and/or metal matrix composites

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] Example 1 (Batch316A-063)

[0045] One is composed of 8236 grams of 316L metal powder (Anval316L-22 micron powder), 612 grams of D.I. water, 165 grams of agar, 11.6 grams of calcium borate, 1.6 grams of methyl-p-hydroxybenzoate (methyl-p-hydroxy benzoate ) and 1.2 g of propyl-p-hydroxybenzoate (propyl-p-hydroxy benzoate) was prepared at 90.5 degrees Celsius in an S-type stirring device for 1 hour. After cooling, the mixture was removed from the mixer and pulverized in a Hobart food grinder. The weight percent of the solid matter is 93%. The material was fed into the hopper of an injection molding equipment (Cincinnati 33 ton). Stretch bars (blank dimensions after firing: length 4.22″, width 0.42″, thickness 0.10″) were molded at an injection pressure (hydraulic pressure) of 1000 psi. The stretch bars were dried in air at 225 degrees Celsius for 2 hours And heated in air at 450 degrees Celsius for 2 hours, followed by sintering in hydrogen at 1375 degrees Celsius for ...

example 2

[0046]Example 2 (Batch316A-070)

[0047] Essentially the same method as Example 1, except that the powder mixture was premixed to contain 70% 22 micron powder and 30% 16 micron powder. Various properties of the sintered tensile bars are listed in Table 3.

example 3

[0048] Example 3 (Batch316A-069)

[0049] Basically the same method as Example 1, except that a 16 micron powder was used. Various properties of the sintered tensile bars are listed in Table 3.

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PUM

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Abstract

Molding compositions for shaping parts from stainless steel powders are disclosed. The process comprises the steps of forming a mixture comprising stainless steel powder, a gel-forming material having a gel strength, measured at a temperature between 0 DEG C and about 30 DEG C. and a gel comprising about 1.5 wt % of the gel-forming material and water, of at least about 200 g / cm2, and water, and molding the mixture at a temperature sufficient to produce a self-supporting article comprising the powder and gel. The preferred gel-forming material is an agaroid and the preferred molding process is injection molding.

Description

field of invention [0001] This invention relates to stainless steel molding compositions for producing parts with excellent sinterability from powders. In particular, the present invention relates to molding methods and molding compositions for forming complex parts having excellent green strength and which can be easily fired into high quality sintered products without cracking, deformation, shrinkage. The sintered products involved in the prior art generally have problems of cracking, deformation and shrinkage. Background of the invention [0002] The use of "green bodies" to produce sintered parts is known in the art. Typically, the green body is formed by filling a powder / binder mixture into a die and extruding the mixture under pressure. The green body, which is a self-supporting structural part, is then removed from the press and sintered. During sintering, the binder volatilizes and burns. However, removing the adhesive may cause the product to crack, shrink and / o...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F1/10B22F3/22
CPCB22F3/22B22F3/225B22F1/0059B22F2998/00B22F1/10
Inventor M·S·泽达利斯R·杜伊金克B·J·斯诺夫A·法尼利J·V·布尔鲁
Owner RUTGERS THE STATE UNIV OF NEW JERSEY (US)