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Powder metallurgy sintering method for bearing cover

A sintering method and powder metallurgy technology, applied in the field of powder metallurgy, can solve the problems of tensile strength, yield strength, elongation, and density that cannot meet the requirements of drawings at the same time

Inactive Publication Date: 2018-03-06
上海汽车粉末冶金有限公司
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Problems solved by technology

[0004] Three kinds of mixed powders with different proportions in the prior art were subjected to sintering tests respectively, and the results showed that under the density requirement of the product, the sintered body obtained by using conventional sintering parameters, its tensile strength, yield strength, elongation, and density could not reach At the same time meet the drawing requirements

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  • Powder metallurgy sintering method for bearing cover
  • Powder metallurgy sintering method for bearing cover
  • Powder metallurgy sintering method for bearing cover

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Embodiment Construction

[0019] The specific implementation of the powder metallurgy sintering method for the bearing cap of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] The bearing cap material involved in the present invention is a modified version of the standard material. The element P is added on the basis of the conventional Fe-C-Cu material. Since P can form an interstitial solid solution with Fe, it can achieve solid solution strengthening, pore spheroidization and activation Sintering and other functions. Adding a certain amount of P can make the iron-based material obtain higher strength and hardness, but at the same time P also drastically reduces the plasticity and toughness, especially the low temperature toughness, so high strength and high elongation must be achieved at the same time. The conventional sintering method Is not feasible.

[0021] Through the modification of the material formula and the sintering furnace, the prop...

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Abstract

The invention relates to the technical field of powder metallurgy, and discloses a powder metallurgy sintering method for a bearing cover. The bearing cover comprises the following material componentsin percentage by mass: 2 to 4 percent of Cu, 0.45 to 0.65 percent of C, 0.45 to 0.65 percent of P, and the balance of Fe; the sintering method comprises a preheating process and a sintering process,wherein the preheating process comprises three stages of preheating temperature, namely a first preheating temperature which is 600+ / -20 DEG C, a second preheating temperature which is 680+ / -20 DEG C,and a third preheating temperature which is 780+ / -20 DEG C; the sintering temperature in the sintering process is 1,250+ / -20 DEG C. According to the powder metallurgy sintering method for the bearingcover, parameters, such as tensile strength, yield strength and elongation percentage, of the bearing cover are improved by adding the element P on the basis of Fe-C-Cu serving as a conventional material and controlling the sintering temperature.

Description

Technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy sintering method for bearing caps. Background technique [0002] The powder metallurgy sintering process is to process the powder compacts below the melting point of the main components of the material for high temperature treatment, and a series of complex physical and chemical changes occur in a certain temperature and atmosphere, the purpose is to produce between the powder particles Metallurgical bonding, even if the powder particles change from mechanical engagement to grain boundary bonding between atoms. [0003] General powder metallurgy bearing cap products use Fe-C-Cu materials. At conventional sintering temperature, atoms migrate, diffuse and flow in large amounts to the particle bonding surface, and shrink, smooth and spheroidize. The sintered product can meet the material standard Required mechanical properties. [0004] In the prior art, three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C33/02B22F3/10
Inventor 姜晓圆丁霞彭景光金文洁袁方成
Owner 上海汽车粉末冶金有限公司
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