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Process for preparing particle-reinforced magnesium-base composite material by vacuum pressure impregnation

A technology of vacuum pressure impregnation and composite materials, which is applied in the field of composite materials, and can solve the problems of complex usage costs of impregnation equipment, large amount of filling protective gas, and large volume of pressure vessels, and achieve perfect stability, good interface bonding, and production high efficiency effect

Inactive Publication Date: 2007-03-28
NANCHANG AERONAUTICAL ENG INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vapor pressure of magnesium alloy is high, and the chemical properties of magnesium are very active. In the molten state, it is very easy to chemically react with oxygen and water vapor, resulting in combustion and explosion, which is relatively dangerous. It is also prone to chemical reactions even with nitrogen.
Sulfur hexafluoride (SF 6 ) mixed gas, carbon dioxide (CO 2 ), sulfur dioxide (SO 2 ), inert gas argon and other gas protection, and pressurized as a pressure gas source, due to the large volume of the pressure vessel and the large amount of filling protection gas, the impregnation equipment is complicated and expensive; at the same time, SF 6 , CO 2 There is a strong greenhouse effect

Method used

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  • Process for preparing particle-reinforced magnesium-base composite material by vacuum pressure impregnation

Examples

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Effect test

Embodiment 1

[0019] This example is the preparation of silicon carbide particle reinforced magnesium-based composite material.

[0020] (1) Reinforcing phase treatment: Magnesium alloy AZ91D is used as the matrix material, and silicon carbide particles with an average particle size of 32 μm are used as the reinforcing phase. The surface of the silicon carbide particles is modified with silane coupling agent KH-570, and then heated at 150 °C. room drying;

[0021] (2) Preparation of prefabricated parts: After drying at 150°C, after uniform mixing with 3% lithium stearate powder, 6% epoxy resin powder, and 6% ammonium dihydrogen phosphate powder, the laser power is 40W, and the scanning speed is 1500mm / s, the sintering distance is 0.1mm, and the powder layer thickness is 0.15mm, and the laser sintered part is sintered and formed, and the laser sintered part is gradually heated to 700 ° C for secondary baking to obtain a silicon carbide preform;

[0022] (3) Preparation of composite materia...

Embodiment 2

[0025] This example is the preparation of silicon carbide particle reinforced magnesium-based composite material.

[0026] (1) Reinforcing phase treatment: Magnesium alloy AZ91D is used as the base material, and silicon carbide particles with an average particle size of 11 μm are used as the reinforcing phase. The surface of the silicon carbide particles is cleaned with 5% dilute HCL solution, and then dried at 200°C;

[0027] (2) Preparation of prefabricated parts: Vibrate the dried silicon carbide particles into low-carbon steel pipes as prefabricated parts, and dry them at 300°C;

[0028] (3) Preparation of composite materials: fix the preform in the resistance furnace in the pressure vessel, sprinkle a layer of RJ-2 flux accounting for 0.2% of the mass of the charge, then place magnesium alloy AZ91D ingots around the preform, and then sprinkle Add a layer of RJ-2 flux; seal the upper and lower tanks, continue to heat the prefabricated parts and magnesium alloy ingots, and ...

Embodiment 3

[0031] This example is the preparation of boron carbide particle-reinforced magnesium-based composite material.

[0032] (1) Reinforcement phase treatment: Magnesium alloy AZ91D is used as the base material, and boron carbide (B4C) particles with an average particle size of 20 μm are used as the reinforcement phase. The surface of the boron carbide particles is cleaned with pure water, and then dried at 150 °C;

[0033] (2) Preparation of prefabricated parts: Vibrate the dried boron carbide particles into low-carbon steel pipes as prefabricated parts, and dry them at 250°C;

[0034] (3) Preparation of composite materials: fix the preform in the resistance furnace in the pressure vessel, sprinkle a layer of potassium chloride and magnesium chloride (KCl+MgCl 2 ) each 50% flux, and then place magnesium alloy AZ91D ingots around the prefabricated part, and then sprinkle a layer of potassium chloride and magnesium chloride 50% flux; Continue to heat the block and start vacuuming....

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Abstract

The invention discloses a technology to make particle enhanced magnesium radical composite material through vacuum pressing infiltration. It covers a protection film on magnesium melt surface and uses air as pressure resource. It has good physical and mechanical properties. Thermal couple, pressure sensor and observation window are set on vacuum pressing infiltration device that would ensure safety. It also has excellent repeatability and stable technology.

Description

technical field [0001] The invention relates to composite materials, in particular to a process for preparing particle-reinforced magnesium-based composite materials by vacuum pressure impregnation. Background technique: [0002] The main characteristics of magnesium-based composite materials are low density, high specific strength and specific stiffness, and also have good wear resistance, impact resistance, excellent shock absorption performance and good dimensional stability. In addition, they also have electromagnetic shielding and storage capacity. Hydrogen properties are a class of excellent structural and functional materials. They are also one of the most promising composite materials in today's high-tech fields. They have great application prospects in aerospace, national defense, automobiles, and electronic packaging. The study of magnesium matrix composites has become one of the research hotspots in the field of materials. [0003] At present, the main methods fo...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C32/00C22C23/00
Inventor 徐志锋余欢蔡长春胡美忠严青松俞子荣
Owner NANCHANG AERONAUTICAL ENG INST
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