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Casting with in-situ generated surface cermet layer and its productino process

A technology of in-situ endogenous and surface metal, which is applied in the field of cermetization of metal surfaces, can solve the problems of easy oxidation and formation of pores, difficulty in forming metallurgical bonding, and unsuitability for mass production, and achieve low cost, improved pressing performance, The effect of cost reduction

Inactive Publication Date: 2005-01-19
王一三
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the characteristics of the method itself, the ceramics used in the thermal spraying method are special ceramic powders added, which are very expensive; it is difficult to form a firm metallurgical bond between the surface layer of the product and the parent body; the surface layer is thin, cannot be changed according to needs, and is easy to oxidize and the formation of pores; many production processes and high costs; not suitable for mass production

Method used

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  • Casting with in-situ generated surface cermet layer and its productino process
  • Casting with in-situ generated surface cermet layer and its productino process
  • Casting with in-situ generated surface cermet layer and its productino process

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Embodiment 1～8

[0020] (1) Manufacture of molds Use conventional water glass sand or clay sand or resin sand to make molds by conventional methods.

[0021] (2) manufacture the compact according to the components listed in Tables 1, 2, and 3, the proportioning of varieties, and the various powders with a particle size≤50 microns are placed in a ball mill or mixed in other mixers together or / and further grinding; then placed in a hydrogen or decomposed ammonia gas reduction furnace, and reduced at a temperature of 600-1000 ° C for 0.5-8 hours; then add 2-12% binder, mix it and put it into a metal mold On a hydraulic press, it is pressed into a compact of 0.5 to 12 mm.

[0022] (3) Pre-sintering and degumming treatment of compacts Place the compacts in a vacuum sintering furnace or a reducing atmosphere sintering furnace, and perform pre-sintering and degumming treatment at a temperature of 500-1400°C.

[0023] (4) Fixing the green compact Fix the cooled green compact on the surface of the m...

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Abstract

The present invention provides a casting with in-situ endogeneous surface metal ceramic layer, its mother body is steel or iron, and it is characterized by that surface metal ceramic layer is obtained by utilizing heat quantity of poured molten steel or molten iron to make powder material pressed blank produce in-situ endogeneous reaction, in which the volume percentage of ceramic granule contained in it is greater than 40% and its thickness can be changed in the range of 0.5-12 mm. Said invention also provides its preparation method, and said casting possesses high wearbility, good toughness, smooth surface and good quality, etc..

Description

technical field [0001] The invention belongs to the technical field of cermetization of metal surfaces, and in particular relates to a casting with an in-situ endogenous surface cermet layer and a preparation method thereof. Background technique [0002] Ceramic materials are the third-generation materials after metal materials and polymer materials. They have good heat resistance, wear resistance and corrosion resistance, but their application is limited due to their high cost and extremely low toughness. In order to improve the toughness of ceramic materials, people began to use a small amount of metal to bond the main phase ceramics together to form a hard material of cermets. While maintaining the inherent good wear resistance of ceramics, this material has greatly improved its toughness due to the addition of metal phases, but its molding method is limited to powder metallurgy (Edited by Li Rongjiu, Ceramic-metal composite Materials, 1995, Metallurgical Industry Press,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/08
Inventor 王一三
Owner 王一三