Method for preparing reactive hot-press in-situ autogenesis aluminium-base composite material

An aluminum-based composite material, an in-situ autogenous technology, which is applied in the field of preparation of reactive hot-pressing in-situ autogenous aluminum-based composite materials, can solve the problems of no filling, waste of powder, cold welding, etc., and achieves density and stretching. The effect of improving performance, improving uniformity and fineness, and increasing powder mixing speed

Inactive Publication Date: 2007-07-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the ceramic particle composite material being prepared by the external addition method, the performance of the ceramic particle composite material is reduced and the reaction hot pressing method in the in-situ generation method is used to prepare the ceramic particle composite material, and the dry mixing of raw materials is prone to "cold welding" , which wastes powder and affects the uniformity of powder mixing. In the process of raw material mixing, argon protection is not filled, so that the raw material is easily oxidized, thereby affecting the tensile properties of the ceramic particle composite material. A heat of reaction provided Preparation method of compressed in-situ self-generated aluminum matrix composites

Method used

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specific Embodiment approach 1

[0007] Specific embodiment one: the preparation method of the reaction hot pressing in-situ authigenic aluminum-based composite material of the present embodiment, it is finished by the following steps: a, mix Al powder, B powder and TiO by ball milling method 2 powder; b, put the mixed powder into a graphite mold for cold pressing, then put the mixed powder together with the graphite mold into a vacuum hot-press furnace for hot pressing and sintering to obtain (TiB 2 +Al 2 o 3 ) / Al composite material; in step a, Al powder: 50-90%, B powder: 2-10%, TiO 2 Powder: 8-40% and added to the ball mill tank, 8-21ml of ethanol is added to every 100 grams of mixed powder, vacuumized, and then filled with 1-1.5 atmospheres of argon, mixed powder on the ball mill, ball The material mass ratio is 1-10:1, the rotating speed is 100-400r / min, the powder mixing time is 6-12h, and finally dried.

specific Embodiment approach 2

[0008] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in the a step of this embodiment, take Al powder: 70%, B powder: 6%, TiO 2 Powder: 24% and join in the ball mill jar, add the ethanol of 14ml in every 100 grams of mixed powders, vacuumize, then charge into the argon of 1.3 atmospheric pressure, mix powder on the ball mill, the mass ratio of ball to material is 5: 1. The speed is 250r / min, and the mixing time is 9h. The above technical parameters can be used to grind the powder into fine powder, mix the powder evenly, and prevent the "cold welding" of the powder and the oxidation of the powder during the ball milling process.

specific Embodiment approach 3

[0009] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step a of this embodiment, take Al powder: 89%, B powder: 2%, TiO 2 Powder: 9% and join in the ball mill jar, add the ethanol of 20ml in every 100 grams of mixed powders, vacuumize, then charge into the argon of 1.5 atmospheric pressure, mix powder on the ball mill, the mass ratio of ball to material is 9: 1. The speed is 390r / min, and the mixing time is 11.5h. The above technical parameters can be used to grind the powder into very fine powder, the uniformity of powder mixing is high, and it can prevent the powder from "cold welding" and powder oxidation during the ball milling process.

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Abstract

The invention relates to a preparation technique of reaction heat pressing original position autogeny aluminium base material, relates to a preparation technique of a complex material. The invention resolves the problem that when prepare the complex material with external method, the performance of the material decreases and prepare ceramic complex material with original position reaction heat pressing method the raw material will easily cold welding when blended dry. The invention includes following steps: a, ball mill Al, B and TiO2 powder adding 8 to 21 ml ethanol and argon gas of 1 to 1.5 atmosphere, the weight ratio the blending material to milling material 1 to 10 : 1, the rotating speed is 100 to 400 round per minutes, the blending period lasts for 6 to 12 hours, dry off the material; b, cold shaping the dried blended powder to black lead mould and then sintering in vacuum heat pressing furnace. The technique is simple and easy operation.

Description

Technical field: [0001] The invention relates to a method for preparing a composite material used as a structural material, in particular to a method for preparing a self-generated aluminum-based composite material in situ by reaction hot pressing. Background technique: [0002] As a structural material, metal matrix composites are being widely used in the field of aerospace due to their excellent performance. The reinforcement of composite materials can be continuous long fibers, or intermittent particles or whiskers. Particle-reinforced metal matrix composites are superior to fiber-reinforced composites because of their low cost and property anisotropy. These particles are added into the metal matrix by external method (that is, by casting or powder metallurgy) to prepare composite materials. It is well known that the ceramic particles in composite materials prepared by external addition method are easy to aggregate and directly lead to a sharp decline in the performance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05B22F3/12
Inventor 王桂松耿林郑镇洙
Owner HARBIN INST OF TECH
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