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High-dispersive-distribution nano-titanium diboride particle reinforced aluminum matrix composite material and preparation method thereof

A technology of nano-titanium diboride and particle-reinforced aluminum, which is applied in the field of advanced metal-matrix composite materials preparation, and can solve the problems of unfavorable high-quality nano-ceramic particles/aluminum-based composite materials, increased thermal cracking tendency of materials, and potential safety hazards in the use of materials, etc. , to achieve the effects of fewer pores/inclusions, improved wettability, and reduced production costs

Active Publication Date: 2019-09-20
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wettability of the ceramic phase with the aluminum melt is poor, which is extremely unfavorable for the preparation of high-quality nano-ceramic particles / aluminum matrix composites
On the one hand, it is difficult to completely introduce nano-ceramic particles into the aluminum melt by the traditional method of adding particles (supplemented by mechanical stirring); on the other hand, in conventional solidification (gravity casting), nano-ceramic particles are repelled by the solid-liquid interface The effect is mostly segregated at the α-Al grain boundary (referred to as the grain boundary), causing large-scale segregation of particles at the grain boundary, which easily increases the thermal cracking tendency of the material and seriously reduces its plastic toughness, causing potential safety hazards in the use of the material and restricting its popularization and application.

Method used

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  • High-dispersive-distribution nano-titanium diboride particle reinforced aluminum matrix composite material and preparation method thereof
  • High-dispersive-distribution nano-titanium diboride particle reinforced aluminum matrix composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1: Put K 2 TiF 6 、KBF 4 The powders were mixed according to the molar ratio of 1:2, and after being fully mixed, they were then added to the pure aluminum melt at a temperature of 800 °C. At the same time, the Nb-Zr alloy ultrasonic amplitude rod was immersed in the melt, and the ultrasonic treatment was performed for 10 minutes. The ultrasonic power was 1.2kW, remove liquid molten salt impurities on the surface of the melt, and obtain Al-TiB after casting 2 master alloy, the resulting Al-TiB 2 TiB in master alloy 2 The mass fraction of particles is 10%.

[0032] Step 2: Al-TiB 2 Master alloy, Al as raw material, prepare 3wt.% TiB 2 Particle reinforced aluminum matrix composites (TiB 2 TiB in particle reinforced aluminum matrix composites 2 The particle mass fraction is 3%), melted at 750° C., and ultrasonicated for 5 minutes with an ultrasonic power of 1.2 kW.

[0033] Step 3: pour the molten aluminum matrix composite material into the steel mold, and at ...

Embodiment 2

[0037] Step 1: Put K 2 TiF 6 、KBF 4 The powders were mixed according to the molar ratio of 1:2. After being fully mixed, they were then added to the pure aluminum melt at a temperature of 750 ° C. At the same time, the Nb-Zr alloy ultrasonic amplitude rod was immersed in the melt, and the ultrasonic treatment was performed for 10 minutes. The ultrasonic power was 1.0kW, remove liquid molten salt impurities on the surface of the melt, and obtain Al-TiB after casting 2 master alloy, the resulting Al-TiB 2 TiB in master alloy 2 The mass fraction of particles is 5%.

[0038] Step 2: Al-TiB 2 Master alloy, Al as raw material, prepare 5wt.% TiB 2 Particle reinforced aluminum matrix composites (TiB 2 TiB in particle reinforced aluminum matrix composites 2 The mass fraction of particles is 5%), melted at 800° C., and ultrasonically treated for 5 minutes.

[0039] Step 3: pour the molten aluminum matrix composite material into the steel mold, and at the same time introduce ult...

Embodiment 3

[0041] Step 1: Put K 2 TiF 6 、KBF 4 The powders were mixed according to the molar ratio of 1:2. After being fully mixed, they were then added to the pure aluminum melt at a temperature of 700 ° C. At the same time, the Nb-Zr alloy ultrasonic amplitude rod was immersed in the melt, and the ultrasonic treatment was performed for 10 minutes. The ultrasonic power was 1.5kW, remove liquid molten salt impurities on the surface of the melt, and obtain Al-TiB after casting 2 master alloy, the resulting Al-TiB 2 TiB in master alloy 2 The mass fraction of particles is 15%.

[0042] Step 2: Al-TiB 2 Master alloy, Al as raw material, prepare 7wt.% TiB 2 Particle reinforced aluminum matrix composites (TiB 2 TiB in particle reinforced aluminum matrix composites 2 The particle mass fraction is 7%), melted at 750° C., and treated with ultrasonic treatment for 5 minutes, and the ultrasonic power was 1.5 kW.

[0043] Step 3: pour the molten aluminum matrix composite material into the s...

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Abstract

The invention discloses a high-dispersive-distribution nano-TiB2 particle reinforced aluminum matrix composite material and a preparation method thereof. Firstly, a uniform-structure Al-TiB2 intermediate alloy is prepared through an ultrasound assisted mixed salt reaction (K2TiF6 / KBF4-Al), wherein the average particle diameter of in-situ endogenous TiB2 particles is smaller than 100nm; the Al-TiB2 intermediate alloy and Al are used as raw materials, or Al-TiB2 intermediate alloy, Al and alloy elements are used as raw materials, the nano-TiB2 particles are introduced into an aluminum (alloy) matrix through an intermediate alloy dilution method, ultrasound agitation treatment is used as assistance, then pouring into a mold is performed, and ultrasound is applied during solidification (introduction through a bottom introduction method); and thus the high-dispersive-distribution nano-TiB2 particle reinforced aluminum matrix composite material is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of advanced metal matrix composite materials, and in particular relates to an ultrasonic-assisted liquid phase composite method for preparing highly dispersed nano-TiB 2 Method for the reinforcement of aluminum matrix composites by granular ceramic particles. Background technique [0002] The nano-ceramic particles / aluminum-based composite material can be prepared by introducing the nano-ceramic particles into the aluminum melt and solidifying by using the liquid-phase composite method. Nano-ceramic particles can refine and strengthen the solidification structure of aluminum alloy, which can greatly improve the specific strength, specific modulus and thermal fatigue resistance of the alloy, making it very useful in aerospace, automobile manufacturing, electronic devices, sports equipment and other fields. Broad application prospects. In addition, the liquid phase composite method has the advantages of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/00C22C32/00B22D27/20
CPCB22D27/20C22C1/026C22C1/03C22C21/00C22C21/003C22C32/0073
Inventor 刘志伟赵樱郑巧玲皇志富高义民邢建东
Owner 咸阳瞪羚谷新材料科技有限公司
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