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Silicon carbide particle reinforced magnesium-based composite material and preparation method

A technology for silicon carbide particles and composite materials, which is applied in the preparation and preparation of silicon carbide particle-reinforced magnesium-based composite materials by a multi-directional forging method, and the field of silicon carbide particle-reinforced magnesium-based composite materials and preparation, can solve problems such as low density and achieve Excellent mechanical properties, good mechanical properties, low cost effect

Inactive Publication Date: 2013-04-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Powder forgings with a density close to the theoretical density of the material can be produced, which overcomes the shortcomings of low density of ordinary powder metallurgy parts

Method used

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  • Silicon carbide particle reinforced magnesium-based composite material and preparation method
  • Silicon carbide particle reinforced magnesium-based composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] A mixed powder in which Mg powder, Al powder and SiC particle powder are mixed is prepared. Wherein the mass percentage of Al powder is 5%, and the mass percentage of SiC particle powder is 5%. The mixed powder was mixed under nitrogen protection for 20min, and then pressed to a density of 1.74g / cm 3 The powder green body is subjected to pressureless sintering at 500°C under vacuum conditions, and the resulting product is the SiC particle-reinforced magnesium-based composite green body. The sintered SiC particle-reinforced magnesium-based composite green body is subjected to multi-directional forging three times on a forging press.

[0018] Density (g / cm 3 ) Hardness / HB σb (MPa) 1.85 52 165.4

Embodiment approach 2

[0020] A mixed powder in which Mg powder, Al powder and SiC particle powder are mixed is prepared. Wherein the mass percentage of Al powder is 7%, and the mass percentage of SiC particle powder is 10%. The mixed powder was mixed under nitrogen protection for 20min, and then pressed to a density of 1.78g / cm 3 The powder green body is subjected to pressureless sintering at 500°C under vacuum conditions, and the resulting product is the SiC particle-reinforced magnesium-based composite green body. The sintered SiC particle-reinforced magnesium-based composite green body is subjected to multi-directional forging three times on a forging press.

[0021] Density (g / cm 3 ) Hardness / HRF σb(MPa) 1.95 55.7 196.4

Embodiment approach 3

[0023] A mixed powder in which Mg powder, Al powder and SiC particle powder are mixed is prepared. Wherein the mass percentage of Al powder is 10%, and the mass percentage of SiC particle powder is 15%. The mixed powder was mixed under nitrogen protection for 20min, and then pressed to a density of 1.92g / cm 3 The powder green body is subjected to pressureless sintering at 500°C under vacuum conditions, and the resulting product is the SiC particle-reinforced magnesium-based composite green body. The sintered SiC particle-reinforced magnesium-based composite green body is subjected to multi-directional forging three times on a forging press.

[0024] Density (g / cm 3 ) Hardness / HRF σb (MPa) 2.01 60 175.3

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Abstract

The invention discloses a silicon carbide particle reinforced magnesium-based composite material and a preparation method thereof, and belongs to the field of a metal-based composite material. The silicon carbide particle reinforced magnesium-based composite material is characterized in that the silicon carbide particle reinforced magnesium-based composite material is prepared by taking pure Mg powder, Al powder and SiC particle micro-powder as raw materials through powder metallurgy and a multi-directional forging method. Through two forming methods: powder metallurgy and multi-directional forging method, an excellent wettability and an excellent combining property are guaranteed between a magnesium alloy substrate and the SiC particles, and residual pores in the material in the powder metallurgy forming process are eliminated, so that the prepared magnesium-based composite material is uniform in distribution of the SiC particles and fine in magnesium alloy substrate grains, and the composite material has an excellent mechanical performance. In comparison with other particle-reinforced magnesium-based composite material preparation methods, the preparation method disclosed by the invention, by a solid forming process, is simple in process, low in cost, easy to industrially produce, and is capable of preparing the SiC particle reinforced magnesium-based composite material which is excellent in mechanical performance.

Description

technical field [0001] The invention discloses a silicon carbide particle-reinforced magnesium-based composite material and a preparation method thereof, belonging to the field of metal-matrix composite materials, and in particular relates to a technical scheme for preparing silicon carbide particle-reinforced magnesium-based composite material and a preparation method by adopting a multi-directional forging method. Background technique [0002] Magnesium alloy has excellent performance, high specific strength and specific stiffness, and excellent electrical conductivity and heat resistance, and has a wide range of applications. However, magnesium alloys have shortcomings such as small elastic modulus, low high temperature strength and creep resistance, limited cold working ability and toughness, high shrinkage during solidification, and poor wear resistance, which cannot be solved only by alloying technology, which greatly limits Industrial applications of magnesium alloys....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C23/00C22C32/00
Inventor 杨琳乔力贾亚斌徐平平邓世岐薛振华包骏
Owner TAIYUAN UNIV OF TECH
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