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Antigravity vacuum sucking cast process for preparing aluminium base composite material

An aluminum-based composite material and vacuum suction casting technology, which is applied in the field of casting, can solve problems such as the inability to form aluminum-based composite materials, and achieve the effect of improving mechanical properties

Inactive Publication Date: 2008-06-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore adopting patent 02115638 cannot form aluminum matrix composite materials, so far, there is no data report of antigravity vacuum suction casting forming of aluminum matrix composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 5wt.%TiB 2p / ZL109 composite material melts at 680 ° C, through N 2 protection, stir for 15 minutes after melting, close the middle partition, turn off the N 2 , the lower chamber is vacuumed and refined, and the refining time is 5 minutes. After the vacuum refining is completed, the lower chamber is connected to N 2 , to protect the refined melt, install the liquid riser, the cavity and the sleeve, after the installation, the upper cavity is vacuumed, and the vacuum degree of the upper cavity reaches -0.03MPa within 5s, and the vacuum is maintained for 1s, and the lower cavity is connected to N 2 , the lower cavity pressure reaches 0.1MPa, after 1min, turn off the vacuum, turn off the N 2 , the filling is completed, the sleeve and the cavity are removed, and the parts are taken out. T5 state mechanical properties of prepared materials: σ b =355Mpa; σ 0.2 =323Mpa; δ=3.5%; E=82.1Gpa.

Embodiment 2

[0023] 12wt.%TiC p / ZL101 composite material melts at 750 ° C, through Ar 2 protection, stir for 50 minutes after melting, close the middle partition, and close the Ar 2 , the lower chamber is vacuumed and refined, and the refining time is 40 minutes. After the vacuum refining is completed, the lower chamber is connected to Ar 2 , to protect the refined melt, install the liquid riser, cavity and sleeve, after the installation is completed, the upper cavity is vacuumed, and the vacuum degree of the upper cavity reaches -0.1MPa within 20s, and the vacuum is maintained for 10s, and the lower cavity is connected to Ar 2 , the lower cavity pressure reaches 0.5MPa, after 5min, turn off the vacuum, turn off the Ar 2 , the filling is completed, the sleeve and the cavity are removed, and the parts are taken out. T6 state mechanical properties of prepared materials: σ b =435Mpa; σ 0.2 = 417Mpa; δ = 1.2%; E = 86.7Gpa.

Embodiment 3

[0025] Will (4wt.%TiB 2 +4wt.%TiC) / ZL114 composite melted at 720°C, passed N 2 protection, stir for 30 minutes after melting, close the middle partition, turn off the N 2 , the lower chamber is vacuumed and refined, and the refining time is 20 minutes. After the vacuum refining is completed, the lower chamber is connected to N 2 , to protect the refined melt, install the liquid riser, cavity and sleeve, after the installation is completed, the upper cavity is vacuumed, and the vacuum degree of the upper cavity reaches -0.07MPa within 10s, and the vacuum is maintained for 5s, and the lower cavity is connected to N 2 , the lower chamber pressure reaches 0.3MPa, after 3min, turn off the vacuum, turn off the N 2 , the filling is completed, the sleeve and the cavity are removed, and the parts are taken out. T6 state mechanical properties of prepared materials: σ b =383Mpa; σ 0.2 =353Mpa; δ=3.3%; E=83.8Gpa.

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Abstract

The antigravity vacuum sucking cast process for preparing aluminum base composite material in casting field includes the following steps: 1. heating to melt the composite material in crucible under the protection of inert gas and stirring; 2. shutting off inert gas, closing the middle partition board and vacuum pumping to refine; 3. finishing vacuum refining, introducing inert gas to crucible surface, and installing riser tube, mold cavity and sleeve; 4. vacuum pumping the mold cavity and antigravity filling liquid metal into the mold cavity; and 5. maintaining for crusting before increasing the pressure of inert gas to the lower cavity, feeding and solidifying composite material under the action of both vacuum in the upper cavity and the pressure of the lower cavity. The present invention raises the mechanical performance of aluminum base composite material casting, can form thin wall complicated aluminum base composite material casting, and has high production efficiency and high casting precision.

Description

technical field [0001] The invention relates to a preparation method in the technical field of casting, in particular to a preparation method of anti-gravity vacuum suction casting of aluminum-based composite materials. Background technique [0002] There are relatively many precision casting methods for aluminum alloy parts. The commonly used ones are: metal mold casting, pressure casting and lost foam casting under gravity filling and solidification, and low pressure casting, differential pressure casting and investment suction casting under anti-gravity filling and solidification. casting etc. Anti-gravity casting is a method of pouring liquid metal against gravity using pressure difference. In order to overcome the limitations of the common anti-gravity casting method, that is, the mold is required to have good air permeability and high strength; in addition, the aluminum alloy in the liquid state is easily oxidized and gas-absorbed when in contact with air. , It is ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/06
Inventor 王浩伟易宏展马乃恒李险峰于敞
Owner SHANGHAI JIAO TONG UNIV
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