Pressure difference casting process of preparing in-situ aluminium base composite material

An aluminum-based composite material and differential pressure casting technology, which is applied in the field of casting, can solve problems such as aluminum-based composite materials that have not yet been discovered, and achieve the effects of improving molding difficulties, improving surface and internal quality, and avoiding oxidation

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

[0004] In further searches, no reports have been found so far that the preparation method of differential pressure casting is applied to the preparation of aluminum matrix composites

Method used

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  • Pressure difference casting process of preparing in-situ aluminium base composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 10wt.% TiB 2 Preparation of in situ particle reinforced ZL109 composites.

[0019] 10wt.%TiB 2 / ZL109 composite material ingots were placed in a crucible for remelting, and nitrogen was used for protection. After melting, stirred for 15 minutes, vacuumed to -0.1Mpa and kept vacuum refining for 15 minutes. After refining, the scum on the surface of the melt was removed. Mount the mold and cover the seal chamber; at P 上 =P 下 =-0.1Mpa, fill the mold, the pressure difference rises to 0.4atm within 5s, and after the crust is kept for 1s, the upper and lower cavities are simultaneously pressurized to: P 上保压 =8.1 atm, P 下保压 =8.5atm, the pressure difference is constant at 0.4atm, and the pressure is maintained for 3 minutes. T5 state mechanical properties of the prepared material: σ b =427Mpa; σ 0.2 =399Mpa; δ=1.5%; E=95.9Gpa. (P 上 ,P 下 ,P 上保压 ,P 下保压 For the representation see figure 1 )

Embodiment 2

[0020] Example 2: Preparation of 10wt.% TiC in-situ particle reinforced ZL101 composite material.

[0021] Put the ingot of 10wt.% TiC / ZL101 composite material into the crucible for remelting, pass nitrogen gas for protection, stir for 50 minutes after melting, vacuumize to -0.1Mpa and keep vacuum refining for 45 minutes, after refining, remove the molten The scum on the surface of the body, install the mold, cover the sealed cavity; boost the pressure of the upper and lower cavity, at P 上 =P 下 Fill the mold at 1atm, and the pressure difference rises to 0.85atm within 18s, at this time P 上保压 = 1 atm, P 下保压 =1.85atm, keep the pressure for 30min. T6 state mechanical properties of prepared materials: σ b =372Mpa; σ 0.2 =339Mpa; δ=2.0%; E=89.3Gpa.

Embodiment 3

[0022] Embodiment 3: (12wt.%TiB 2 +4wt.% TiC) in situ particle reinforced ZL114 composites.

[0023] Will (8wt.%TiB 2 +4wt.%TiC) / ZL114 composite material ingot was placed in a crucible for remelting, and nitrogen was introduced for protection. After melting, stirring for 30 minutes, vacuuming to -0.1Mpa kept vacuum refining for 30 minutes. After refining, remove Surface scum, install the mold, cover the sealed cavity; boost the pressure of the upper and lower cavity, at P 上 =P 下 =P 常压 Fill the mold at 1atm, the pressure difference rises to 0.3atm within 50s, and after the crust is kept for 1s, the upper and lower cavities are simultaneously pressurized to: P 上保压 =2.0atm,P 下保压 =2.3atm, the pressure difference is constant at 0.3atm, and the pressure is maintained for 10min. T5 state mechanical properties of the prepared material: σ b =325Mpa; σ 0.2 =253Mpa; δ=4.8%; E=88.5Gpa.

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Abstract

The pressure difference casting process of preparing in-situ aluminum base composite material in casting technology field includes the following steps: re-melting liquid metal, introducing inert gas for protection and stirring; setting cast mold and crucible separately inside the upper and the lower mold cavity, sealing and vacuum refining to deair; increasing the pressure of the upper and the lower mold cavity to initial pressure, pressure difference casting via liquid raising and filling, i. e., increasing the pressure of the lower mold cavity to pressurize the metal liquid into mold cavity in antigravity direction; and pressurizing the upper and the lower mold cavity simultaneously while maintaining the pressure difference in between for high pressure solidification and feeding until complete solidification. The present invention applies pressure difference casting technology in preparing in-situ aluminum base composite material and can form thin wall complicated and high precision casting of in-situ aluminum base composite material.

Description

technical field [0001] The invention relates to a preparation method in the field of casting technology, in particular to a preparation method for differential pressure casting of an in-situ aluminum matrix composite material. Background technique [0002] Differential pressure casting belongs to the field of precision casting. It is used in the production of large, thin-walled and complex aluminum castings in aviation, aerospace, electronics and other industries. Differential pressure casting is a special anti-gravity casting method. Its forming feature is that during the casting process, the flow direction of the liquid metal is opposite to the effect of gravity, so that the flow rate of the liquid metal can be controlled, thereby reducing the curling that occurs during the pouring process. Gas and slag inclusions. The differential pressure casting method is a new casting method developed in the early 1960s. This method originated from low-pressure casting, which has the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/00
Inventor 易宏展王浩伟马乃恒于敞
Owner SHANGHAI JIAO TONG UNIV
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