Unlock instant, AI-driven research and patent intelligence for your innovation.

Novel in-situ self-generated hypereutectic aluminum-silicon alloy composite modifier and preparation method thereof

A composite modifier, in situ autogenous technology

Inactive Publication Date: 2020-05-08
SHANGHAI JIAOTONG UNIV +1
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When P and Sr compound and deteriorate, they will react to form Sr 3 P 2 compound, leading to the same problem as the compound modification of P and Na; when using P and RE compound modification, the amount of RE is large, and rare earth is a strategic resource, which is expensive and expensive, which limits its application in the industrial field
[0004] Studies have shown that nano-Al 2 o 3 Ceramic particles can effectively refine the primary silicon structure, and can effectively modify the eutectic silicon to achieve the effect of compound modification (Hongseok Choi et al.Materials Science and Engineering A541(2012)159-165), but Al 2 o 3 The modification effect on primary silicon is not as good as that of P

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Novel in-situ self-generated hypereutectic aluminum-silicon alloy composite modifier and preparation method thereof
  • Novel in-situ self-generated hypereutectic aluminum-silicon alloy composite modifier and preparation method thereof
  • Novel in-situ self-generated hypereutectic aluminum-silicon alloy composite modifier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 10% by mass of commercial Al-12Si-5P master alloy, Al 2 o 3 5% by mass, the rest is industrial pure aluminum to weigh raw materials; Al 2 o 3 Particles, in NH 4 Al(SO 4 ) 2 According to the in situ reaction equation 2NH 4 Al(SO 4 ) 2 =Al 2 o 3 +2NH 3 +4SO 3 +H 2 Added in the form of O to generate 5% Al 2 o 3 , need to add 23.2% mass fraction of NH 4 Al(SO 4 ) 2 powder, at the same time the weighed NH 4 Al(SO 4 ) 2 The powder was wrapped with aluminum foil for use.

[0031] Heat the weighed industrial pure aluminum to 880°C in the high temperature resistance furnace Ⅰ, and stir it properly. After the melt is completely melted, keep it warm for 5 minutes to obtain the alloy melt Ⅰ. After heating the -5P master alloy to 700°C, stir it properly, and keep it warm for 10 minutes after the alloy melt is completely melted to obtain alloy melt II; wrap the NH 4 Al(SO 4 ) 2 The powder is added to the alloy melt Ⅰ, and the stirring is continued to make the ...

Embodiment 2

[0035] 80% by mass of commercial Al-12Si-5P master alloy, 5.4% by mass of industrial pure silicon, Al 2 o 3 0.5% by mass, the rest is industrial pure aluminum to weigh raw materials; Al 2 o 3 particles in NH 4 Al(SO 4 ) 2 According to the in situ reaction equation 2NH 4 Al(SO 4 ) 2 =Al 2 o 3 +2NH 3 +4SO 3 +H 2 Added in the form of O to generate 0.5% Al 2 o 3 , need to add 2.32% mass fraction of NH 4 Al(SO 4 ) 2 powder, at the same time the weighed NH 4 Al(SO 4 ) 2 The powder was wrapped with aluminum foil for use.

[0036] Heat the weighed industrial pure aluminum and industrial pure silicon to 930°C in the high temperature resistance furnace Ⅰ, and stir them properly. After the melt is completely melted, keep it warm for 30 minutes to obtain alloy melt Ⅰ. After the commercial Al-12-5P master alloy is heated to 800°C, it is properly stirred, and after the alloy melt is completely melted, it is kept for 120 minutes to obtain alloy melt II; the NH wrapped wi...

Embodiment 3

[0040] 50% by mass of commercial Al-12Si-5P master alloy, 14% by mass of industrial pure silicon, Al 2 o 3 2.5% by mass, the rest is industrial pure aluminum to weigh raw materials; Al 2 o 3 particles in NH 4 Al(SO 4 ) 2 According to the in situ reaction equation 2NH 4 Al(SO 4 ) 2 =Al 2 o 3 +2NH 3 +4SO 3 +H 2 Added in the form of O, generating 2.5% Al 2 o 3 , need to add 11.6% mass fraction of NH 4 Al(SO 4 ) 2 powder, at the same time the weighed NH 4 Al(SO 4 ) 2 The powder was wrapped with aluminum foil for use.

[0041] Heat the weighed industrial pure aluminum and industrial pure silicon to 900°C in the high temperature resistance furnace Ⅰ, and stir them properly. After the melt is completely melted, keep it warm for 20 minutes to obtain alloy melt Ⅰ. After the commercial Al-12Si-5P master alloy is heated to 750°C, it is properly stirred, and after the alloy melt is completely melted, it is kept for 60 minutes to obtain the alloy melt II; the NH wrappe...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a novel in-situ self-generated hypereutectic aluminum-silicon alloy composite modifier and a preparation method thereof, which comprises the following raw materials in percentage by weight: 1.2-20% of silicon, 0.5-4% of phosphorus, and 0.5-5% of aluminum oxide , the balance is aluminum, and the phosphorus comes from Al-12Si-5P master alloy; After mixing industrial pure aluminum and pure silicon, they are completely melted in a high-temperature resistance furnace, and NH is added 4 Al(SO 4 ) 2 Powder undergoes in situ reaction to generate Al 2 o 3 After the reaction is complete, pour it into the prefabricated Al‑12Si‑5P alloy melt, stir it evenly and keep it warm, and then pour it into shape; use this composite modifier to modify the hypereutectic aluminum silicon alloy, which can effectively fine The primary crystal silicon can be transformed into eutectic silicon well, and its refining effect on primary silicon is more significant than that of traditional AlP.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a novel in-situ self-generated hypereutectic aluminum-silicon alloy composite modifier and a preparation method thereof, which are used for preparing modified hypereutectic aluminum-silicon alloys. Background technique [0002] Hypereutectic aluminum-silicon alloy is an important casting alloy, which has the advantages of low density, good thermal stability, high hardness, good wear resistance, low thermal expansion coefficient, etc., so it is widely used in electronic packaging materials, automotive engine pistons, Aerospace, military industry and other fields. However, in the unmodified hypereutectic aluminum-silicon alloy structure, there are coarse plate-shaped primary silicon and long needle-shaped eutectic silicon, which severely split the matrix, deteriorated the alloy structure, and significantly reduced the strength and toughness of the alloy. , limi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/06C22C21/04
CPCC22C1/06C22C1/1036C22C21/04C22C1/1052
Inventor 王奎朱运茂蒋海燕余水金余智成
Owner SHANGHAI JIAOTONG UNIV