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Low pressure casting process of preparing in-situ aluminium-base composite material

An aluminum-based composite material and low-pressure casting technology, which is applied in the field of casting, can solve problems such as difficulty in forming aluminum-based composite materials, and achieve the effects of enhancing the solidification and feeding capacity, solving serious oxidation and ensuring quality.

Inactive Publication Date: 2006-03-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a low-pressure casting preparation method of in-situ aluminum-based composite materials, which makes it the first time to apply the method of low-pressure casting to the preparation of in-situ aluminum-based composite parts to solve the problem of aluminum-based composite materials. Difficult forming of composite materials, this method can prepare high-performance aluminum matrix composite castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: 10wt.% TiB 2 Preparation process of particle reinforced ZL109 composite.

[0014] 10wt.%TiB 2 / ZL109 composite material ingot is put into the crucible and melted, and N 2 For protection, when the pouring temperature reaches 750 ° C, stir for 15 minutes; after stirring, cover the middle partition, install the mold, vacuumize, the vacuum degree is -0.1MPa, and keep the vacuum for 5 minutes; then pressurize the sealed crucible for 0.5 Atm, fill the mold, the liquid rise time is 25s, after the filling is completed, the crust is kept under pressure for 5s, then the pressure in the crucible is quickly increased to 10atm, the pressure is kept for 30min, the pressure is released, and the parts are taken out. T5 state mechanical properties of the prepared material: σ b =413Mpa; σ 0.2 =389Mpa; δ=1.3%; E=94.8Gpa.

Embodiment 2

[0015] Example 2: 10wt.% TiB 2 Preparation process of particle reinforced ZL101 composite.

[0016] 10wt.%TiB 2 / ZL101 composite material ingot is put into the crucible and melted, and N 2 For protection, when the pouring temperature reaches 680 ° C, stir for 50 minutes; after stirring, cover the middle partition, install the mold, vacuumize, the vacuum degree is -0.1MPa, and keep the vacuum for 40 minutes; then pressurize the sealed crucible for 1atm , fill the mold, and the liquid raising time is 50s. After the filling is completed, the crust is kept under pressure for 10s, and then the pressure in the crucible is quickly increased to 5 atm, and the pressure is released after the pressure is kept for 15 minutes, and the parts are taken out. T6 state mechanical properties of prepared materials: σ b =370Mpa; σ 0.2 =332Mpa; δ=1.8%; E=88.8Gpa.

Embodiment 3

[0017] Example 3: 10wt.% TiB 2 Preparation process of particle reinforced ZL104 composites.

[0018] 10wt.%TiB 2 / ZL104 composite material ingot is put into the crucible and melted, and Ar 2 For protection, when the pouring temperature reaches 715°C, stir for 30 minutes; after stirring, cover the middle partition, install the mold, vacuumize, the vacuum degree is -0.1MPa, and keep the vacuum for 20 minutes; then seal the crucible and pressurize 0.2atm , fill the mold, and the liquid raising time is 5s. After the filling is completed, the crust is kept under pressure for 1s, and then the pressure in the crucible is quickly increased to 1atm, and the pressure is released after the pressure is kept for 1min. T5 state mechanical properties of the prepared material: σ b =305Mpa; σ 0.2 =231Mpa; δ=4.2%; E=85.1Gpa.

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PUM

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Abstract

The low pressure casting process of preparing in-situ aluminum-base composite material includes the following steps: melting and stirring the composite material under the protection of inert gas; sealing liquid metal inside sealing crucible with middle partition and installing the cast mold on the middle partition; deairing the composite material in vacuum environment; pressurizing the sealed crucible to pressurize liquid composite material into mold cavity in the antigravity direction; maintaining the pressure after crusting for some period; raising the pressure inside the crucible to certain high pressure and maintaining the high pressure until complete solidification of the casting; eliminating pressure and taking out the casting. The present invention applies low pressure casting method in preparing in-situ aluminum-base composite material and can form high performance aluminum-base composite material.

Description

technical field [0001] The invention relates to a preparation method in the technical field of casting, in particular to a preparation method of low-pressure casting of an in-situ aluminum-based composite material. Background technique [0002] Low-pressure casting belongs to special casting. As far as the casting process pressure is concerned, it is a new casting process between pressure casting and gravity casting. The principle of low-pressure casting is: in the crucible filled with alloy liquid (the crucible itself It is a sealed container), and dry compressed air is introduced to act on the surface of the alloy liquid that maintains a certain pouring temperature, resulting in a pressure difference between the sealed container and the mold cavity, so that the alloy liquid is under the action of a lower filling pressure , along the inner hole of the riser pipe from top to bottom through the infusion channel and the mold gate to fill the mold smoothly; after the alloy liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/04
Inventor 王浩伟易宏展马乃恒陈东李险峰
Owner SHANGHAI JIAO TONG UNIV
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