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Method for preparing ramie-form SiC ceramic/Al-based composite material

A composite material, ramie technology, applied in the field of composite material preparation, can solve the problems of poor mechanical strength and wear resistance, achieve the effects of reducing thermal expansion coefficient and density, improving impregnation uniformity, and increasing sol impregnation rate

Inactive Publication Date: 2011-10-12
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing SiC ceramic / Al-based composite material in ramie form, which solves the problems of poor mechanical strength and wear resistance of existing biomorphic C ceramic / metal composite materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw ramie hemp is cut to 5-10mm long, and then soaked in advance with tetraethyl orthosilicate (TEOS), ethanol (C 2 h 5 OH) and H 2 O in a solution with a molar ratio of about 1:1:4, and adjust the pH value to 4-5, place it at room temperature for 24 hours, then adjust the pH value to 8-9 in a 60°C water bath environment and supplement it with ultrasound Vibration impregnation for 2h, until SiO 2 The sol agglomerates and turns into a gel, and after drying at 60 °C for 24 h, the ramie / SiO 2 precursor, and then beat the precursor to shake off the SiO adhered to the surface of the ramie fiber 2 Gel, remove to dry. repeated operations to make SiO 2 The weight ratio of ramie and ramie is 3:7; the impregnated and dried ramie / SiO 2 Put the precursor into a vacuum or nitrogen protection tube furnace, and sinter at 1400°C for 2 hours to prepare a SiC / C composite material with a ramie fiber structure; calcinate the SiC / C composite material aerobically at 600°C for 2 hou...

Embodiment 2

[0030] The alkali-treated ramie is cut to a length of 5-10 mm, and then soaked in advance with tetraethyl orthosilicate (TEOS), ethanol (C 2 h 5 OH) and H 2 O in a solution with a molar ratio of about 1:1:4, and adjust the pH value to 4-5, place it at room temperature for 24 hours, then adjust the pH value to 8-9 in a 60°C water bath environment and use vacuum- Pressure impregnation for 2h, until SiO 2 The sol agglomerates and turns into a gel, and after drying at 60 °C for 24 h, the ramie / SiO 2 precursor, and then beat the precursor to shake off the SiO adhered to the surface of the ramie fiber 2Gel, remove to dry. repeated operations to make SiO 2 Reach the weight ratio with alkali-treated hemp (3:6; the alkali-treated hemp / SiO after impregnation and drying 2 The precursor was placed in a tube furnace protected by vacuum or nitrogen, and sintered at 1450 ° C for 1 h to prepare SiC / C composites with a ramie fiber structure. The SiC / C composite material was calcined aer...

Embodiment 3

[0032] The ramie dry hemp is cut to 5-10mm long, and then soaked in advance with tetraethyl orthosilicate (TEOS), ethanol (C 2 h 5 OH) and H 2 O in a solution with a molar ratio of about 1:1:4, and adjust the pH value to 4-5, place it at room temperature for 24 hours, then adjust the pH value to 8-9 in a 60°C water bath environment and use vacuum- Pressure impregnation for 2h, until SiO 2 The sol agglomerates and turns into a gel, and after drying at 60 °C for 24 h, the ramie / SiO 2 precursor, and then beat the precursor to shake off the SiO adhered to the surface of the ramie fiber 2 Gel, remove to dry. repeated operations to make SiO 2 The weight ratio of hemp and dry hemp is 3:7; the dry hemp / SiO after impregnation and drying 2 The precursor was placed in a tube furnace protected by vacuum or nitrogen, and sintered at 1500 ° C for 1 h to prepare SiC / C composites with a ramie fiber structure. The SiC / C composite material was calcined aerobically at 700 °C for 1 h to ob...

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Abstract

The invention discloses a method for preparing a ramie-form SiC ceramic / Al-based composite material, comprising the following steps of: firstly, pre-treating ramie fibers; then performing vacuum and pressure impregnation of SiO2 sol on the pre-treated ramie fibers so as to obtain a ramie / SiO2 precursor; then performing anoxic and aerobic compound calcination on the ramie / SiO2 precursor so as to obtain ramie-form porous SiC ceramic precast body; and finally, performing vacuum and pressure impregnation on the ramie-form porous SiC ceramic precast body so as to obtain the ramie-form SiC ceramic / Al-based composite material. The ramie-form SiC ceramic / Al-based composite material prepared with the method in the invention has the advantages of light weight, shock absorbability, sound absorbability and good antifriction wear resistance and can be used for reducing thermal expansion coefficient and density, thereby having a wider application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a method for preparing an ecological ceramic / metal matrix composite material, in particular to a method for preparing a ramie-shaped SiC ceramic / Al-based composite material. Background technique [0002] At present, the known technologies of ecological ceramics / metal matrix composites include: 1. The article "Research Progress of Network Interpenetrating Structure Composites" (Functional Materials [J], 2002, 33(1): 22-25); 2. Article "Research concept and research progress of relic materials" (Materials Herald [J], 2006, 10:5-7); 3. Article "Preparation and performance analysis of high damping wood ceramic / MB15 composite material" (Journal of Composite Materials [J], 2003, 20 (1): 8-11); 4. The article "Wood-ceramic composites with network interpenetrating structure" (Journal of Materials Research [J], 2002, 16: 259-262); 5. Patent name: "Preparation method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C47/08C22C47/02C22C49/14C22C101/14C22C121/00
Inventor 贺辛亥刘江南王俊勃杨敏鸽胡新煜付翀徐洁苏晓磊齐乐华姜凤阳
Owner XI'AN POLYTECHNIC UNIVERSITY
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