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A method for preparing in-situ three-dimensional continuous reinforced al-based composites

A composite material and three-dimensional technology, which is applied in the field of preparing in-situ three-dimensional continuous reinforced Al-based composite materials, can solve the problems of low strength of prefabricated parts, complicated preparation process, easy defects (crack interface reaction, etc.), and achieve controllable design, combination high intensity effect

Active Publication Date: 2018-01-19
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

Porous preforms can be prepared by organic precursor impregnation method, powder sintering method, ablation method, foam hanging method, sol-gel method, etc., but the above methods often have problems such as complicated preparation process and low preform strength.
On the other hand, during the filling process of Al melt, auxiliary processes such as impregnation, extrusion, and die-casting are usually required, and defects (cracks, interface reactions, etc.) are prone to occur at the interface between the Al matrix and the reinforcement, which will affect the performance of the composite material.

Method used

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  • A method for preparing in-situ three-dimensional continuous reinforced al-based composites
  • A method for preparing in-situ three-dimensional continuous reinforced al-based composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Ti powder (purity greater than 99%, average particle size 20 μm), Al powder (purity greater than 99%, average particle size 40 μm) and graphite powder (purity greater than 99%, average particle size 40 μm) according to 2:1: 1 molar ratio mixed, and then fully ground in a glass mortar for 30min to obtain a mixed powder;

[0036] Step 2: Put the mixed powder into a cylindrical steel mold with an inner diameter of 10mm, and cold press it into a cylindrical green body with a thickness of 15mm under a radial pressure of 130MPa;

[0037] Step 3: Preheat the green body at 800°C for 2 minutes, then put it into an Al melt at 800°C, let it stand for 45s, take it out and cool it, so as to obtain an in-situ three-dimensional continuous reinforced Al-based composite material.

[0038] figure 1 It is a photo of the in-situ three-dimensional continuous reinforced Al-based composite obtained after the thermal explosion reaction of the Al-Ti-C body in the Al melt. It can be se...

Embodiment 2

[0040] Step 1: Ti powder (purity greater than 99%, average particle size 20 μm), Al powder (purity greater than 99%, average particle size 40 μm) and graphite powder (purity greater than 99%, average particle size 40 μm) according to 2:1.1: The molar ratio of 1 was mixed, and then fully ground in a glass mortar for 50min to obtain a mixed powder;

[0041] Step 2: Put the mixed powder into a cylindrical steel mold with an inner diameter of 10mm, and cold press it under a radial pressure of 50MPa into a cylindrical green body with a thickness of 20mm;

[0042] Step 3: Preheat the green body at a temperature of 850°C for 1.5min, then put it into an Al melt at 850°C, let it stand for 45s, take it out and cool it, so as to obtain an in-situ three-dimensional continuous reinforced Al-based composite material.

Embodiment 3

[0044] Step 1: Ti powder (purity greater than 99%, average particle size 20 μm), Al powder (purity greater than 99%, average particle size 40 μm) and graphite powder (purity greater than 99%, average particle size 40 μm) according to 2:1: 1 molar ratio mixed, and then fully ground in a glass mortar for 60min to obtain a mixed powder;

[0045] Step 2: Put the mixed powder into a cylindrical steel mold with an inner diameter of 10mm, and cold press it into a cylindrical green body with a thickness of 10mm under a radial pressure of 100MPa;

[0046] Step 3: Preheat the green body at a temperature of 700°C for 3 minutes, then put it into an Al melt at 700°C, let it stand for 60 seconds, take it out and cool it, so as to obtain an in-situ three-dimensional continuous reinforced Al-based composite material.

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Abstract

The invention discloses a method for preparing an in-situ three-dimensional continuous reinforced Al-based composite material. First, Ti powder, Al powder and graphite powder are mixed according to a molar ratio of 2:(1-1.2):1, and then ground to obtain a mixed powder. ; Then put the mixed powder into the mold for cold pressing to obtain a green body; finally preheat the green body and add it to the Al melt at a temperature of 700-900 ° C, and take the green body out of the melt to cool after the reaction , that is, the in-situ three-dimensional continuous reinforced Al-based composite material is obtained. The invention utilizes the thermal explosion reaction of the Al-Ti-C system to rapidly prepare the in-situ three-dimensional continuous reinforced Al-based composite material.

Description

technical field [0001] The invention belongs to the field of preparation of advanced metal-based composite materials, and in particular relates to a method for preparing in-situ three-dimensional continuous reinforced Al-based composite materials. Background technique [0002] Three-dimensional continuous reinforced Al-based composites, also known as network crossed Al-based composites, the reinforcement and the Al matrix are continuous in three-dimensional space and interpenetrate to form a network structure. Compared with traditional particle and fiber reinforced Al-based composite materials, this composite configuration is more helpful to give full play to the performance of reinforcement and matrix. Therefore, three-dimensional continuous reinforced Al-based composites have high strength, high hardness, good wear resistance and thermal shock resistance, high thermal conductivity, low thermal expansion coefficient, and are widely used in aerospace, automotive, electronics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C21/00C22C32/00
CPCC22C1/1036C22C21/00C22C32/0052C22C1/1052
Inventor 刘志伟邢建东皇志富高义民郑巧玲
Owner 咸阳瞪羚谷新材料科技有限公司
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