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Method for preparing bicontinuous-phase composite through non-pressure infiltration

A technology of bicontinuous phase and composite material, which is applied in the field of preparing bicontinuous phase composite material by pressureless infiltration, can solve the problems of high cost and low efficiency, and achieve the effects of accelerated destruction, simple operation process, and improved cost and efficiency.

Active Publication Date: 2020-01-24
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, among the above improvement measures, some processes require expensive equipment, some processes require complex operations, and some processes have high cost and low efficiency.

Method used

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  • Method for preparing bicontinuous-phase composite through non-pressure infiltration
  • Method for preparing bicontinuous-phase composite through non-pressure infiltration
  • Method for preparing bicontinuous-phase composite through non-pressure infiltration

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Experimental program
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Effect test

Embodiment 1

[0046] The pressureless infiltration preparation of the SiC / Al dual continuous phase composite material of this embodiment includes the following steps:

[0047] (1) Grinding, degreasing and cleaning the surface of the aluminum alloy green body with the brand of 6061.

[0048] (2) Lay a layer of modified quartz sand with a thickness of 3mm on the bottom of the alumina crucible, place the Al alloy green body on the SiC porous ceramic preform, and place it in the crucible covered with modified quartz sand; The Al alloy green body and the SiC porous ceramic preform are filled in the crucible with the flexible quartz sand, so that the Al alloy green body, the SiC porous ceramic preform and the inner wall of the crucible are filled with modified quartz sand with a thickness of 10-20 mm. Specific as figure 1 As shown, it can be seen that the white crucible placed in the muffle furnace is filled with Al alloy green body and SiC porous ceramic preform (the preform is below, which cannot be...

Embodiment 2

[0055] The pressureless infiltration preparation of the SiC / Al dual continuous phase composite material of this embodiment includes the following steps:

[0056] (1) Grinding, degreasing and cleaning the surface of the aluminum alloy green body with the brand of 6061.

[0057] (2) Lay a layer of modified quartz sand with a thickness of 3mm on the bottom of the alumina crucible, place the Al alloy green body on the SiC porous ceramic preform, and place it in the crucible covered with modified quartz sand; The Al alloy green body and the SiC porous ceramic preform are filled in the crucible with the flexible quartz sand, so that the Al alloy green body, the SiC porous ceramic preform and the inner wall of the crucible are filled with modified quartz sand with a thickness of 10-20 mm.

[0058] The pore density of the SiC porous ceramic preform is 15 ppi, the porosity is 82.3%, the average pore diameter is 2.1 mm, and the pore size is 0.89 mm.

[0059] Modified quartz sand is formed by mi...

Embodiment 3

[0064] The pressureless infiltration preparation of the SiC / Al dual continuous phase composite material of this embodiment includes the following steps:

[0065] (1) Grinding, degreasing and cleaning the surface of the aluminum alloy green body with the brand of 6061.

[0066] (2) Lay a layer of modified quartz sand with a thickness of 2mm on the bottom of the alumina crucible, place the Al alloy green body on the SiC porous ceramic preform, and place it in the crucible with modified quartz sand; The Al alloy green body and the SiC porous ceramic preform are filled in the crucible with the flexible quartz sand, so that the Al alloy green body, the SiC porous ceramic preform and the inner wall of the crucible are filled with modified quartz sand with a thickness of 10-20 mm.

[0067] The pore density of the SiC porous ceramic preform is 10 ppi, the porosity is 80.2%, the average pore size is 2.3 mm, and the pore size is 0.97 mm.

[0068] Modified quartz sand is formed by mixing liquid ...

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Abstract

The invention relates to a method for preparing a bicontinuous-phase composite through non-pressure infiltration, and belongs to the technical field of non-pressure infiltration. According to the method for preparing the bicontinuous-phase composite through non-pressure infiltration, modified quartz sand is utilized for filling a pre-infiltration body (to-be-infiltrated porous matrix and infiltration metal), heating is carried out for non-pressure infiltration, an air-previous liquid-tight mold shell is formed by the modified quartz sand, and after non-pressure infiltration is completed, cooling is carried out to obtain the bicontinuous-phase composite. According to the method, the space in a formed mold and the pre-infiltration body are consistent in size, the mold is previous to air andliquid-tight, air in the mold can be exhausted conveniently, and generated oxidized film is reduced; meanwhile, infiltration metal melt is effectively prevented from flowing and running off from the four sides, the oxidized film on the surface of the infiltration metal melt can be promoted to be damaged under the action of dead weight, and then the infiltration metal melt infiltrates into the porous matrix; in the presence of silicon in the modified quartz sand, damage to the metal oxidized film can be promoted, the non-pressure infiltration time can be shortened, and therefore the non-pressure infiltration efficiency is improved.

Description

Technical field [0001] The invention relates to a method for preparing a dual continuous phase composite material by pressureless infiltration, and belongs to the technical field of pressureless infiltration. Background technique [0002] With the rapid development of my country's aerospace, rail transit, electronic technology, weaponry and other fields, its moving parts have put forward higher and higher requirements for the wear resistance of materials. Commonly used wear-resistant materials are particle-reinforced composite materials, which belong to 1-3 (one-dimensional friction components and three-dimensional matrix) connected composite materials. The typical problem is that the dispersed reinforcement particles cannot be effectively distributed under service conditions. Dissipate the heat generated by normal work and the large amount of heat caused by friction in time, so that the ability of the material to resist high temperature deformation and adhesive wear is limited, ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C21/08C22C32/00
CPCC22C1/1036C22C1/1015C22C21/08C22C32/0063C22C1/1021C22C1/1047
Inventor 傅丽华周孟刘建贺甜甜岳赟杜三明倪锋张永振马彪
Owner HENAN UNIV OF SCI & TECH
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