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A method for preparing silicon carbide nanowire-reinforced titanium matrix composites at low temperature

A technology of silicon carbide nanowires and titanium-based composite materials, which is applied in the directions of silicon carbide, carbide, nanotechnology, etc., can solve the problems of weakening the toughening effect of silicon carbide nanowires and losing the structural characteristics of silicon carbide nanowires. Guarantee the effect of strengthening and toughening, improve the effect of strengthening and toughening, and improve the mechanical properties

Active Publication Date: 2020-06-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of preparing silicon carbide nanowire-reinforced titanium-based composites by hot-pressing sintering process, due to the high activity of titanium in high-temperature environment (the temperature of hot-pressing sintering process is usually 1200 ℃ ~ 1400 ℃), silicon carbide nanowires are easy to produce titanium. reaction, forming carbides and silicides, and losing the inherent structural characteristics of silicon carbide nanowires, which leads to weakening of the strengthening and toughening effect of silicon carbide nanowires

Method used

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  • A method for preparing silicon carbide nanowire-reinforced titanium matrix composites at low temperature
  • A method for preparing silicon carbide nanowire-reinforced titanium matrix composites at low temperature
  • A method for preparing silicon carbide nanowire-reinforced titanium matrix composites at low temperature

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Embodiment 1

[0036] This embodiment includes the following steps:

[0037]Step 1, mix absolute ethanol and tetraethyl orthosilicate and stir evenly, then add distilled water and a hydrochloric acid solution with a mass concentration of 37% and stir uniformly to obtain a silica sol; the absolute ethanol, tetraethyl orthosilicate , The molar ratio of hydrochloric acid in distilled water and hydrochloric acid solution is 3:0.5:3:0.1;

[0038] Step 2. Add graphite powder with a particle size of 60 mesh to 150 mesh to the silica sol obtained in step 1 and stir for 20 minutes, then place it in an oven, and dry it for 12 hours at a temperature of 100°C to obtain a coated silica sol. Graphite powder of silica sol; the mass ratio of graphite powder to silica sol with a particle size of 60 mesh to 150 mesh is 1:5;

[0039] Step 3, placing the graphite powder coated with silica sol obtained in step 2 in a high-temperature tube furnace for carbothermal reduction reaction, and then undergoing an ultra...

Embodiment 2

[0059] This embodiment includes the following steps:

[0060] Step 1, mix absolute ethanol and tetraethyl orthosilicate and stir evenly, then add distilled water and a hydrochloric acid solution with a mass concentration of 37% and stir uniformly to obtain a silica sol; the absolute ethanol, tetraethyl orthosilicate , The molar ratio of hydrochloric acid in distilled water and hydrochloric acid solution is 5:2:8:0.5;

[0061] Step 2. Add graphite powder with a particle size of 60 mesh to 150 mesh into the silica sol obtained in step 1 and stir for 60 minutes, then place it in an oven, and dry it for 24 hours at a temperature of 100°C to obtain a coated silica sol. Graphite powder of silica sol; the mass ratio of graphite powder to silica sol with a particle size of 60 mesh to 150 mesh is 1:5;

[0062] Step 3, placing the graphite powder coated with silica sol obtained in step 2 in a high-temperature tube furnace for carbothermal reduction reaction, and then undergoing an ultr...

Embodiment 3

[0066] This embodiment includes the following steps:

[0067] Step 1, mix absolute ethanol and tetraethyl orthosilicate and stir evenly, then add distilled water and a hydrochloric acid solution with a mass concentration of 37% and stir uniformly to obtain a silica sol; the absolute ethanol, tetraethyl orthosilicate , The molar ratio of hydrochloric acid in distilled water and hydrochloric acid solution is 4:1.5:6:0.3;

[0068] Step 2. Add graphite powder with a particle size of 60 mesh to 150 mesh into the silica sol obtained in step 1 and stir for 40 minutes, then place it in an oven, and dry it for 20 hours at a temperature of 100°C to obtain a coated silica sol. Graphite powder of silica sol; the mass ratio of graphite powder to silica sol with a particle size of 60 mesh to 150 mesh is 1:5;

[0069] Step 3, placing the graphite powder coated with silica sol obtained in step 2 in a high-temperature tube furnace for carbothermal reduction reaction, and then undergoing an ul...

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Abstract

The invention discloses a method for low-temperature preparing of a silicon carbide nanowire reinforced titanium matrix composite. According to the method, absolute ethyl alcohol, ethyl orthosilicate,distilled water and hydrochloric acid are evenly mixed, graphite powder is added, graphite powder wrapped with silicon dioxide sol is obtained, through the carbon thermal reduction reaction, a silicon carbide nanowire is obtained, the silicon carbide nanowire is subjected to ultrasonic dispersion, titanium powder is added, heat preservation and even stirring are carried out, through drying, silicon carbide nanowire and titanium powder mixed powder is obtained, discharge plasma hot pressed sintering is carried out, and the silicon carbide nanowire reinforced titanium matrix composite is obtained. Discharge plasma hot pressed sintering is carried out at the low temperature and high pressure, the phenomenon that in the high-temperature environment, the silicon carbide nanowire has a reactionwith the titanium to generate carbide and silicide is avoided, strengthening and toughening effects of the silicon carbide nanowire can be ensured, meanwhile, the silicon carbide nanowire and the titanium base are tightly combined, the multi-scale toughened structure is formed, the strengthening and toughening effects of the silicon carbide nanowire can be improved, and the mechanical property ofthe silicon carbide nanowire reinforced titanium matrix composite can be improved.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a silicon carbide nanowire-reinforced titanium-based composite material at low temperature. Background technique [0002] As lightweight structural materials with excellent performance, titanium and titanium alloys have high specific strength, specific stiffness, good processability, corrosion resistance and high temperature resistance. It has broad application prospects in many fields such as energy. However, the disadvantages of titanium and titanium alloys such as poor wear resistance and low hardness hinder their application in engineering. In order to meet various needs accompanied by the rapid development of high-tech, it is urgent to develop new titanium alloy composite materials to meet the needs of aerospace industry development. [0003] Silicon carbide nanowires have excellent properties such as high strength, high modu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C49/11C22C49/14C22C47/14C01B32/97B82Y40/00C22C101/14
CPCB82Y40/00C01B32/97C22C47/14C22C49/11C22C49/14
Inventor 刘跃霍望图张于胜李宇力马腾飞周宣于佳石
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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