Microwave reaction synthesis method for endogenous metal matrix composite material

A composite material and microwave reaction technology, applied in the field of microwave reaction synthesis method, to achieve the effect of purifying the matrix, shortening the preparation cycle, and refining the structure

Inactive Publication Date: 2010-03-10
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The object of the present invention is to provide a microwave reaction method for endogenous metal matrix composites that is simple in process operation, safe and reliable, ener

Method used

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  • Microwave reaction synthesis method for endogenous metal matrix composite material
  • Microwave reaction synthesis method for endogenous metal matrix composite material
  • Microwave reaction synthesis method for endogenous metal matrix composite material

Examples

Experimental program
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Example Embodiment

[0027] Example 1: Al-TiO 2 -B reaction system

[0028] (1) Prepare the reaction sample with Al, TiO 2 , B powder according to the set reinforcement (TiB 2 And Al 2 O 3 ) Volume fraction (such as 30%), from the chemical reaction formula: 4Al+3TiO 2 +6B→3TiB 2 +2Al 2 O 3 By stoichiometric calculation, the reaction formula Meet the thermodynamic conditions of the reaction. It is calculated that 20g reaction sample requires 15.43g Al powder and TiO 2 Powder 4.57g and B powder 0.57g. Then put it in a ball mill tank, mix it with a ball mill at a ball-to-powder ratio of 5:1 and a rotation speed of 300p.r.m, and then extrude it at a pressure of 120MPa to form a compact sample;

[0029] (2) Sample loading Put the compact sample into the reaction device, see figure 1 ; Pay attention to the following points when loading samples: 1) Bare the top of the compact sample to ensure the accuracy of infrared temperature measurement on the top of the sample; 2) Do not block the side monitoring hole w...

Example Embodiment

[0035] Example 2: Al-ZrO 2 system

[0036] (1) Prepare the reaction sample by Al, ZrO 2 Powder according to the set reinforcement (Al 3 Zr and Al 2 O 3 ) Volume fraction (such as 30%), from the chemical reaction formula: 13Al+3ZrO 2 →3Al 3 Zr+2Al 2 O 3 By stoichiometric calculation, the reaction formula Meet the thermodynamic conditions of the reaction. By calculation, a 20g reaction sample requires 16.1g Al powder and ZrO 2 3.9g powder, then put it into a ball mill tank, mix it with a ball mill at a ball-to-powder ratio of 5:1 and a rotation speed of 300p.r.m, and then extrude it at a pressure of 120MPa to form a compact sample;

[0037] (2) Sample loading Put the compact sample into the reaction device, see figure 1 ; Pay attention to the following points when loading samples: 1) Bare the top of the compact sample to ensure the accuracy of infrared temperature measurement on the top of the sample; 2) Do not block the side monitoring hole with SiC absorber to ensure the side durin...

Example Embodiment

[0043] Example 3: Al-Ni 2 O 3 reaction system

[0044] (1) Prepare the reaction sample by combining Al and Ni 2 O 3 Powder according to the set reinforcement (Ni 2 Al 3 And Al 2 O 3 ) Volume fraction (such as 20%), from the chemical reaction formula: 5Al+Ni 2 O 3 →Ni 2 Al 3 +Al 2 O 3 By stoichiometric calculation, the reaction formula Meet the thermodynamic conditions of the reaction. It is calculated that 20g reaction sample requires 13.26g Al powder and Ni 2 O 3 1.74g powder, then put it into a ball mill tank, mix it with a ball mill at a ball-to-powder ratio of 5:1 and a rotation speed of 300p.r.m, and then extrude into a billet at a pressure of 120MPa to make a compact sample;

[0045] (2) Sample loading Place the compact sample into the reaction device (see figure 1 ); Pay attention to the following points when loading the sample: 1) Bare the top of the compact sample to ensure the accuracy of infrared temperature measurement on the top of the sample; 2) Do not block the side ...

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Abstract

The invention discloses a microwave reaction synthesis method for an endogenous metal matrix composite material, which comprises the following steps: preparing a reaction sample; filling the sample, namely filling the pressed sample into a reaction device, and filling an SiC wave-absorbing agent around the sample; pumping vacuum; synthesizing microwave, namely regulating microwave input power to alower limit value, closing a gate and powering on the sample; preserving heat, namely when the color of the reaction sample is suddenly changed and simultaneously the temperature change curve recorded by far infrared rays is hastily raised to produce sharp steep peaks, reducing the microwave input power to preserve the heat, and stopping microwave input after the heat is preserved for a certain time; and discharging the sample from a furnace, namely after a vacuum furnace is cooled, taking the reaction device out, and taking the reaction sample out from the reaction device to obtain the endogenous composite material. The microwave reaction synthesis method has the advantages of simple process operation, safety and reliability, energy conservation and time saving, environmental protectionand simplified operation process, can greatly reduce the energy consumption, saves the energy as high as 70 to 90 percent, and shortens the preparation period which is generally about 15 minutes.

Description

technical field [0001] The invention belongs to the preparation technology of metal matrix composite materials, in particular to a microwave reaction synthesis method of endogenous metal matrix composite materials. Background technique [0002] Endogenous metal matrix composites refer to the reinforcement produced by the in-situ reaction in the matrix. The surface of the reinforcement is free from pollution, the interface with the matrix is ​​clean, the bonding strength is high, the thermodynamics is stable, and the high heat of the reaction can also purify the matrix. Further improve the organization and improve the performance of composite materials. At present, the preparation methods of endogenous metal matrix composites mainly include: self-propagating combustion reaction method, thermal diffusion reaction method, contact reaction method, mixed salt reaction method, direct oxidation method, gas-liquid reaction method, pressureless infiltration reaction method , plasma ...

Claims

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Application Information

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IPC IPC(8): B22F3/16C22C1/04
Inventor 朱和国王恒志
Owner NANJING UNIV OF SCI & TECH
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