Quick zero-defect degreasing method for large-size extrusion forming blank

An extrusion forming, large-scale technology, applied in the field of powder metallurgy, can solve the problems of high cost and product surface pollution, and achieve the effect of improving shape retention, improving degreasing efficiency, and convenient, rapid and defect-free degreasing.
CN102248167AInactive Publication Date: 2011-11-23CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2011-11-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a quick zero-defect degreasing method for a large-size extrusion forming blank, comprising the following steps of: feeding a formed blank into a solvent degreasing tank and adding a degreasing solvent at the same time, wherein the ratio of a liquid to a solid is 7:1-15:1; degreasing under the condition of constant temperature of 30-60 DEG C for 6-12h; taking out the degreased blank and drying the greased blank at the constant temperature of 30-50 DEG C for 0.5-1h; replacing the degreasing solvent and drying; repeating 2-3 times until the mass loss of a binding agent reaches 60-75 percent; and feeding a solvent greasing blank in a high-temperature degreasing furnace and raising the temperature to 600-850 DEG C in the atmosphere of vacuum or negative pressure to obtain the zero-defect large-size degreasing blank. According to the quick zero-defect degreasing method disclosed by the invention, the defects of long degreasing time of the large-size forming blank, poor degreasing shape retention and more greasing defects are overcome; in addition, two adopted degreasing processes are simple, easy to control and are widely applied in actual production.
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Description

technical field

[0001] The invention belongs to the technical field of powder metallurgy, and relates to a degreasing technology of powder near-net shape. Background technique

[0002] Powder Injection Molding (PIM) and Powder Extrusion Molding (PEM) are two new powder metallurgy near-net forming technologies that have developed rapidly in recent years. They are suitable for processing and forming various metals, alloys, ceramic powders and other materials, especially for forming such Cemented carbide, copper, steel, tungsten, high melting point intermetallic compounds, ceramics and other materials that are difficult to prepare by conventional processing and forming methods can use these two technologies, which provide new technologies for the research and development of new materials and their products method.

[0003] The basic process of PIM and PEM is:

[0004] Powder + binder→mixing→injection or extrusion molding→remove binder→sintering

[0005] Among them, the desig...

Claims

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