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Method for quickly preparing precious metal parts at low temperature

A technology for precious metals and parts, which is applied in the field of rapid preparation of precious metal parts by electric field-assisted sintering at low temperature, can solve problems such as difficulty in forming, and achieve the effects of achieving uniform reliability, improving preparation speed, and refining grains

Active Publication Date: 2012-12-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, precious metal crucibles are mainly prepared by hot forging extrusion method. This method has advantages for metals with low melting point and high ductility, but it has great limitations for brittle metals with high melting point, such as ruthenium, rhodium, osmium, iridium and other precious metals. The casting-formed precious metal body is hot-forged at high temperature, which is difficult to form

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  • Method for quickly preparing precious metal parts at low temperature
  • Method for quickly preparing precious metal parts at low temperature

Examples

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Effect test

Embodiment 1

[0031] In this embodiment, the precious metal part is a cylindrical ruthenium target, and its appearance is as follows figure 1 As shown, the cross-sectional diameter is 80mm, and the thickness is 4mm. The following is the specific preparation method of the ruthenium target:

[0032] First, the shape and size of the graphite mold are precisely designed according to the actual shape and size of the preformed ruthenium target; then, the precious metal ruthenium powder with a particle size of 600 mesh and a purity of 99.99% is accurately weighed and put into the graphite mold for cold pressing. The applied pressure is 10 MPa; finally, put the cold-pressed graphite mold into an electric field-assisted electric spark ion sintering furnace for sintering, and keep it warm after sintering to the sintering temperature. After sintering to the sintering temperature, keep it warm for 10 minutes, apply a pressure of 40MPa, and the entire sintering process is carried out in a vacuum with a ...

Embodiment 2

[0036] In this embodiment, the precious metal product is a ruthenium crucible, and its appearance is as follows figure 2 As shown, the cross-sectional diameter is 20mm, the height is 4mm, and the uniform thickness is 2mm. The following is the specific preparation method of the ruthenium crucible:

[0037] First, the shape and size of the graphite mold are precisely designed according to the actual shape and size of the preformed ruthenium crucible; then, the precious metal ruthenium powder with a particle size of 300 mesh and a purity of 99.99% is accurately weighed and put into the graphite mold for cold pressing. The applied pressure is 30MPa; finally, put the cold-pressed graphite mold into an electric field-assisted electric spark ion sintering furnace for sintering, and keep it warm after sintering to the sintering temperature. The heating rate is 50°C / min, and the sintering temperature is 1300°C The time is 30 minutes, the applied pressure is 30MPa, and the whole sinterin...

Embodiment 3

[0040] In this embodiment, the precious metal part is a ruthenium-gold mixed target, wherein the mass percentage of ruthenium and gold is 1:1, and the appearance of the ruthenium-gold mixed target is similar to figure 1 As shown, the cross-sectional diameter is 50 mm, and the thickness is 5 mm. The following is the specific preparation method of the ruthenium-gold hybrid target:

[0041] First, accurately design the shape and size of the graphite mold according to the actual shape and size of the preformed ruthenium-gold mixed target; then, weigh 50% by mass of the precious metal ruthenium powder and gold powder with a particle size of 200 mesh and a purity of 99.99%. Put it into a resin tank and use resin balls as the medium to dry mix for 10 hours. After sieving, put the mixed powder into a graphite mold for cold pressing, and apply a pressure of 10 MPa; finally, put the cold-pressed graphite mold into an electric field assisted Sinter in an electric spark ion sintering furn...

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Abstract

The invention provides a method for quickly preparing precious metal parts at a low temperature. The method comprises the steps as follows: designing a die based on the overall dimension of a pre-formed precious metal parts; feeding the raw material which is the precious metal powder into the die; carrying out press molding at 10 to 100MPa firstly; and then transferring into an electric spark ion sintering device; heating to reach the temperature of sintering by controlling the heating rate under a vacuum or common protective atmosphere condition; and keeping the temperature for a certain time so as to obtain the formed precious metal parts. Compared with the existing preparation method of precious metal parts, the method can prepare the precious metal parts by once sintering; and by adopting the method, the sintering temperature can be greatly reduced, the preparation speed can be raised, and the obtained parts is uniform and has high density; and the method is a simple and practicable preparation method which has low cost and has commercial application value.

Description

technical field [0001] The invention relates to a method for preparing noble metal parts, in particular to a method for rapidly preparing noble metal parts by electric field assisted sintering at low temperature. Background technique [0002] Precious metals are a class of metals that are less abundant in the earth's crust. They have unique electrical, thermal, and catalytic properties, so they are difficult to be replaced by other elements. At present, noble metals play an important role in the field of high-tech electronics and in the field of single crystal preparation. For example, precious metal ruthenium is an important ohmic contact material in semiconductors, and is also widely used as wiring and electrode materials for integrated circuits; precious metals such as gold and silver have good conductivity and can also be used as wiring materials and electrical contact materials. [0003] Since precious metals are rare resources, how to make the most effective use of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16
Inventor 瞿东胡春峰胡劲黄庆王玉天申璐周小兵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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