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Preparation method of aluminum oxide metal ceramic reinforced iron-based composite

A technology of iron-based composite materials and alumina ceramics, which is applied in the field of preparation of alumina cermet-reinforced iron-based composite materials, can solve problems such as environmental pollution, achieve reduced production costs, uniform structure and components, and good high-temperature mechanical mechanics performance effect

Inactive Publication Date: 2013-01-09
北京康盛宏达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the content disclosed in the patent specification, it is known that the invention has certain requirements for the withstand pressure of the casting sandbox and other supporting equipment, and as the volume of the used sandbox increases, the greater the withstand pressure value is required; In addition, the polystyrene model is gasified and discharged by the vacuum pump during the pouring process, which will bring some pollution to the environment and requires subsequent treatment

Method used

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  • Preparation method of aluminum oxide metal ceramic reinforced iron-based composite

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Embodiment 1

[0018] Preferably, the technical solution of the present invention is implemented according to the following steps to prepare an alumina cermet reinforced iron-based composite material.

[0019] Step 1. Preparation of alumina cermet preform

[0020] The alumina cermet skeleton green body prefabricated with the active Si element is sintered at a high temperature of 800-850° C. for 30 minutes to produce a surface-modified alumina cermet preform 4 with mesh-like pores. Among them, the porosity of the cermet prefabricated part 4 is about 45% vol%, and the shape is determined by the shape and size of the final required composite material parts and tooling molds.

[0021] Step 2. Prepare casting sand mold

[0022] Coated lining: prepare a polypropylene plastic mandrel similar in shape to the gating system, cover the side of the mandrel with 1-3 layers of newspaper or straw paper; then wrap the alumina-based metal with 1-3 layers of newspaper or straw paper The outer side of the ce...

Embodiment 2

[0032]Preferably, the technical scheme of the present invention is implemented according to the following steps to prepare a No. 45 steel-based composite material that is tightly bonded with alumina cermet by two media.

[0033] The steps are basically the same, the difference is that: step 1, the alumina corundum sand with an average particle size of 1.5mm prefabricated by the active Si element is used as a ceramic skeleton body, and the surface is modified by sintering to form a mesh-like pore. The alumina ceramic preform 4 has a porosity of about 55 vol%. In the third step, No. 45 steel is melted into a steel metal liquid at 1500-1550 °C, and pouring is started, that is, an alumina-based cermet reinforced No. steel composite.

[0034] The alumina cermet-reinforced steel-based composite material prepared by the above-mentioned embodiment has uniform distribution of ceramic particles, and the metal phase fills and penetrates the mesh-like pores of the entire cermet prefabric...

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Abstract

The invention relates to a preparation method of aluminum oxide metal ceramic reinforced iron-based composite, namely, aluminum-oxide-based metal ceramic is used as a structural framework and one of effective components to prepare metal ceramic iron-based composite, which is consistent in structure, even in metal phase distribution, high in mechanical performance, and high in wear resistance, under certain pressure by melt casting and further processing. The preparation method includes the steps of firstly, preparing aluminum oxide metal ceramic framework base pretreated by activated Si into surface-modified prefabricated ceramic part with a silk-screen-shaped pore structure by high-temperature sintering; secondly, preparing a pouring sand module; thirdly, placing the pouring sand module into a casting sand box for pretreating, pouring, vacuumizing, and allowing iron-based molten metal to fully permeate into pores of the prefabricated ceramic part to form a rigid integrity; and fourthly, performing heat treatment and air cooling to obtain the iron-based composite with closely combined aluminum oxide metal ceramic and iron base.

Description

technical field [0001] The invention relates to the technical field of preparation of metal-based ceramic composite materials, in particular to a preparation method of alumina cermet-reinforced iron-based composite materials. Background technique [0002] As a kind of ceramic-metal composite material, cermet not only has the advantages of low density, high strength, high hardness, high wear resistance, high temperature erosion resistance and other advantages of ceramic materials, but also has the toughness, strong thermal conductivity, thermal conductivity and other advantages of metal materials. Stability and processability make it gradually become one of the effective methods for material modification. [0003] The performance of cermet-iron-based composites largely depends on the dispersion and interfacial wettability of ceramic particles, especially for alumina ceramics, because the density of the iron-based metal melt is very different, and the ceramic particles are sus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/02
Inventor 康闻端刘磊丁洪录康毅忠
Owner 北京康盛宏达科技有限公司
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