TiB2/Ai high--damp composite material and preparing method thereof

A composite material and preparation technology, which is applied in the field of high-damping cast aluminum-based composite materials and its preparation, can solve the problems of specific gravity and limitations

Inactive Publication Date: 2004-12-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the high-damping aluminum-zinc casting alloy prepared by the above method has many advantages, due to its large specific gravity and other shortcomings, the application of zinc-aluminum alloy in aerospace and other fields requiring high damping and low density is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The matrix is ​​prepared as Si 13%, Cu 1%, Mg 1.3%, and the rest is a high damping composite material of Al, in which TiB 2 The content is 20%, the process is as follows:

[0017] After the aluminum-silicon alloy ingot is melted, it is covered with a covering agent. The melt temperature reaches 900°C, and K 2 TiF 6 、KBF 4 Mix the salts, and stir with a stirring device at a stirring speed of 400 rpm for 10 minutes, and the stirring temperature is 900°C. Scoop out the mixed salt reaction product, add Si, Cu, Mg to adjust the chemical composition, leave it at 780°C for 10 minutes, and then pour it into the ingot mold to obtain TiB 2 / Al high damping composite material. The obtained composite material was cut into a damping sample of 50 mm × 5 mm × 1 mm, and the damping value Q of the prepared high damping composite material was measured by DMTA -1 =7~30×10 -3 .

Embodiment 2

[0019] A high-damping composite material with a matrix composition of 8.5% Si, 0.3% Mg, 0.5% Mn and the rest of Al was prepared, in which TiB 2 The content is 0.1%, the process is as follows:

[0020] After the aluminum-silicon alloy ingot is melted and covered with a covering agent, the melt temperature reaches 790°C, and K 2 TiF 6 、KBF 4 Mix the salts, and stir with a stirring device at a stirring speed of 300 rpm for 20 minutes, and the stirring temperature is 790°C. Scoop out the mixed salt reaction product, add Si, Mg, Al-Mn to adjust the chemical composition, leave it at 730°C for 20 minutes, and then pour it into the ingot mold to obtain TiB 2 / Al high damping composite material. The obtained composite material was cut into a damping sample of 50 mm × 5 mm × 1 mm, and the damping value Q of the prepared high damping composite material was measured by DMTA -1 =8~34×10 -3 .

Embodiment 3

[0022] Prepare a high damping composite material with a matrix composition of 4% Si, 0.2% Mg, 8% Cu, and the rest Al, in which TiB 2 The content is 10%, the process is as follows:

[0023] After the aluminum-silicon alloy ingot is melted, it is covered with a covering agent. The melt temperature reaches 680°C, and K 2 TiF 6 、KBF 4 Mix the salts and stir for 30 minutes at a stirring speed of 200 rpm with a stirring device, and the stirring temperature is 680°C. Scoop out the mixed salt reaction product, add Si, Mg, Cu to adjust the chemical composition, leave it at 680°C for 30 minutes, and then pour it into the ingot mold to obtain TiB 2 / Al high damping composite material. The obtained composite material was cut into a damping sample of 50 mm × 5 mm × 1 mm, and the damping value Q of the prepared high damping composite material was measured by DMTA -1 =7~32×10 -3 .

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Abstract

An in-situ self-generated high damping TiB2 / Al composite material and its preparation are disclosed. It consists of Si 4 - 13wt%, Cu 0 - 8wt%, Mg 0 - 1.3wt%, Mn 0 - 0.9wt%, TiB2 0.1 - 20wt%, and balanced of Al. It is prepared by salts reaction, which includes: melting Al ingots, keeping temperature and adding mixture of dry K2TiF6 and KBF4 salts, stirring and taking out mixed salt product when reaction ends up, adding Si, and Cu, Mg, Mn or one or two of them to regulate chemical constituent, settling, and casting into ingots to obtain the high damping TiB2 / Al material. Granules of the said material have clean surface with good binding effect with Al substrate surface. Its damping at normal temperature reaches high standard, so that it can be used in development of structure-functional materials.

Description

technical field [0001] The invention relates to a high-damping cast aluminum-based composite material and its preparation process, in particular to a TiB 2 / Al high damping composite material and its preparation process. belongs to the field of materials. Background technique [0002] As a new type of structural material with good mechanical and physical properties, metal matrix composites have increasingly become ideal materials in the fields of aviation, aerospace, automobiles, and electronics industries, and have extremely good application prospects. Certain dynamic structures need to strictly control their vibration and noise, which puts forward higher requirements on the damping performance of materials. Traditional aluminum alloy materials belong to the ranks of low damping materials, and their normal temperature damping performance Q -1 <10×10 -3 , can not meet the development of high-tech fields for high damping performance requirements of materials, high damp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C32/00
Inventor 王浩伟张亦杰马乃恒李险峰易宏展
Owner SHANGHAI JIAO TONG UNIV
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