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Constructible SiCp/Al matrix composite and preparation method thereof

An aluminum-based composite material and structure technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of uncontrollable addition of SiC particles, uncontrollable content of SiC particles, uncontrollable degree of bonding of aluminum alloys, etc., and achieve expansion The effect of low coefficient, improved coating strength and high thermal conductivity

Active Publication Date: 2020-11-27
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the object of the present invention is to provide a kind of structurable SiCp / Al aluminum matrix composite material and its preparation method, through NiO 2 And oxidized SiC particles, greatly improving the wettability of SiC particles and aluminum alloys; polystyrene pre-expanded particles and hydrolyzed tetraethyl orthosilicate can construct SiC particle skeletons with controllable porosity, which solves the problem of existing preparation methods The amount of SiC particles added is uncontrollable, and the wettability with the aluminum alloy matrix is ​​poor, making the content of SiC particles uncontrollable and the degree of bonding with the aluminum alloy uncontrollable.

Method used

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  • Constructible SiCp/Al matrix composite and preparation method thereof
  • Constructible SiCp/Al matrix composite and preparation method thereof
  • Constructible SiCp/Al matrix composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 , a method for preparing a structurable SiCp / Al aluminum matrix composite material, comprising the following steps:

[0043] S1, preparation of foam particles

[0044] Pass steam into the stirred tank to preheat, add polystyrene resin (EPS) beads into the preheated stirred tank, and then pass steam to heat for pre-foaming; wherein, the diameter of the foamed particles after foaming is 0.1 ~2mm;

[0045] S2, oxidized SiC particles

[0046] Put the SiC particles in an industrial microwave sintering furnace, and perform a high-temperature oxidation reaction at 1200 ° C for 3 hours, so that a layer of SiO is formed on the surface of the SiC particles. 2 The oxide layer can increase the wettability of SiC particles and aluminum alloy; among them, the particle size of SiC particles is 5-30 μm;

[0047] S3, preparation of coating aggregate

[0048] oxidized SiC particles with NiO 2Powder mixed to form paint aggregate; among them, NiO 2 The mass of the powde...

Embodiment 2

[0067] A kind of preparation method of structurable SiCp / Al aluminum matrix composite material is the same as the method of embodiment 1, and its difference is:

[0068] In S2, the temperature of the high temperature oxidation reaction is 1300°C, and the reaction time is 2h;

[0069] S3, NiO 2 The mass of the powder is 5% of the mass of the oxidized SiC particles;

[0070] In S4, the binding agent is ethyl orthosilicate and white latex, and the mass of the white latex is 3wt% of the mass of the hydrolyzed ethyl orthosilicate. The mass ratio of tetraethyl orthosilicate to SiC particles is 1:4. The mass of the defoaming agent is 0.2wt% of the mass of the binder; the mass of the surfactant is 0.3wt% of the mass of the binder.

[0071] In S5, the volume ratio of paint to foam particles is 1:5;

[0072] In S6, in the drying oven, the drying and curing temperature is 60°C, and the time is 5 hours;

[0073] In the high temperature furnace, the sintering temperature is 900°C, and...

Embodiment 3

[0078] A kind of preparation method of structurable SiCp / Al aluminum matrix composite material is the same as the method of embodiment 1, and its difference is:

[0079] In S2, the temperature of the high temperature oxidation reaction is 1000°C, and the reaction time is 3h;

[0080] S3, NiO 2 The mass of the powder is 2% of the mass of the oxidized SiC particles;

[0081] In S4, the binding agent is hydrolyzed orthosilicate and white latex, and the mass of the white latex is 2 wt% of the mass of the hydrolyzed orthosilicate. The mass ratio of tetraethyl orthosilicate to SiC particles is 1:1. The mass of the defoaming agent is 0.1 wt% of the mass of the binder; the mass of the surfactant is 0.2 wt% of the mass of the binder.

[0082] In S5, the volume ratio of paint to foam particles is 1:3;

[0083] In S6, in the drying oven, the drying and curing temperature is 40°C, and the drying time is 8 hours;

[0084] In the high temperature furnace, the sintering temperature is 7...

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Abstract

The invention provides a constructible SiCp / Al matrix composite and a preparation method thereof. The preparation method comprises the following steps of S1, mixing oxidized SiC grains and NiO2 powder, and then mixing the mixed oxidized SiC grains and NiO2 powder with a bonder, an antifoaming agent and a surfactant evenly to form a coating; S2, evenly mixing the coating with foam grains, conducting filtering through a screen, charging the mixed materials into a mold cavity and pressing into a precast block; S3, drying and solidifying the precast block, and conducting sintering on the precast block at 700-900 DEG C for 2-3 h to form the precast block; and S4, pouring molten aluminum alloy into the mold cavity, and charging the preheated precast block on the molten aluminum alloy; or, charging the preheated precast block into the mold cavity and then pouring molten aluminum alloy; and conducting preparation through the pressure infiltration method to obtain the constructible SiCp / Al matrix composite. Through NiO2 and SiO2 oxidation layers, the wettability of SiC and aluminum alloy is greatly improved. Polystyrene pre-foamed grains and hydrolyzed ethyl orthosilicate can construct a voidage controllable SiC grain skeleton.

Description

technical field [0001] The invention belongs to the technical field of metal matrix composite material preparation, and in particular relates to a structurable SiCp / Al aluminum matrix composite material and a preparation method thereof. Background technique [0002] With the rapid development of modern science and technology, people have higher and higher requirements for materials. In addition to requiring materials to have excellent mechanical properties and good comprehensive properties, they often hope that materials have some special properties. Single engineering materials such as metals, ceramics, and polymers have been difficult to meet these performance requirements. [0003] Composite materials have a series of advantages such as high specific strength, high specific modulus, low expansion, and low density. In particular, metal matrix composites (MMCs), which not only have excellent mechanical properties, but also have a series of metal properties such as electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D23/04B22D27/09C22C21/02C22C32/00C04B35/565C04B35/622C04B35/63C04B38/06
CPCB22D23/04B22D27/09C04B35/565C04B35/622C04B35/6303C04B38/067C04B2235/3279C04B2235/602C04B2235/656C04B2235/6567C22C21/02C22C32/0052C04B38/02
Inventor 郭永春杨伟李建平夏峰杨忠马志军段洪波
Owner XIAN TECHNOLOGICAL UNIV
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