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Cobalt trivalent oxide metal alloy surface refiner

A technology of cobalt trioxide and metal alloys, which can be used in metal processing equipment, coating, casting and molding equipment, etc., and can solve the problems of high price and so on.

Inactive Publication Date: 2009-04-29
大连核心铸造技术工程研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, because cobalt oxide is a better surface refiner, but its price is more expensive

Method used

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Examples

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Effect test

Embodiment 1

[0009] Embodiment 1: A kind of dicobalt trioxide metal alloy surface refiner, is made up of dicobalt trioxide, corundum powder and molybdenum alloy, wherein the weight content of dicobalt trioxide is 55%; Corundum powder 30%; Molybdenum alloy weight content 15%. When preparing this refining agent, the raw materials prepared in proportion to cobalt trioxide, corundum powder and molybdenum alloy are heated and dried at low temperature, ball milled for 12 hours, roasted at 1300°C for 4 hours, and ball milled for 5 hours. The purpose of ball milling is to mix and pulverize the material as uniformly as possible.

[0010] When using the refiner provided by the present invention, the prepared refiner can be mixed with silica sol to prepare silica sol refinement slurry, and the viscosity of the slurry is controlled within 20s. The silica sol refinement slurry is coated on the investment casting surface, and the crystal grains on the surface of the casting are made fine by virtue of t...

Embodiment 2

[0012] Embodiment 2: a dicobalt trioxide metal alloy surface refiner, the weight content of dicobalt trioxide is 75%; corundum powder 10%; molybdenum alloy weight content 15%. The above-mentioned surface refiner for nickel-based superalloy contains 8% titanium oxide by total weight. When using the refiner provided by the present invention, the prepared refiner can be mixed with silica sol to prepare silica sol refinement slurry, and the viscosity of the slurry is controlled within 30s.

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Abstract

The invention relates to a surface refiner of a cobalt sesquioxide metal alloy, which consists of 55 to 75 weight percent of cobalt sesquioxide, 10 to 30 weight percent of alundum powder and 15 to 35 weight percent of molybdenum alloy. The components are mixed well according to the proportion, dried by heating at low temperature, ball milled, roasted at high temperature and ball milled for a second time so as to lead the powder materials to be mixed evenly. The refinement mechanism of the refiner is as follows: the grains of the cobalt sesquioxide are refined due to that the reduced metallic cobalt structure of the cobalt sesquioxide is extremely similar to the matrix of a high temperature alloy, i.e., both of the two are face-centered cubic, and the lattice constant is about 3.5 multiplied by 10<-10> meters. Therefore, a high temperature alloy matrix phase is crystallized and formed on metallic cobalt. As crystal cores increase, the grain size on the casting surface is relatively petty. The increase of the molybdenum alloy crystal cores has invigoration effect, thereby improving the mechanical property of products and improving the toughness and tensile strength of the products.

Description

technical field [0001] The invention relates to a cobalt trioxide metal alloy surface refiner and belongs to the technical field of metal grain treatment on the surface of nickel-based superalloys. Background technique [0002] The structure and properties of heat-resistant alloys are mainly determined by its chemical composition and production process, but heat treatment is also one of the important means to change the structure and properties of alloys. The heat treatment of heat-resistant alloys generally consists of solution treatment and aging treatment. Solid solution treatment is used to refine the grain on the surface of the casting. Usually, a certain amount of grain refiner is added to the investment casting surface coating, and the surface of the casting is made by the interaction between the metal liquid and the refiner in the surface coating. Fine grains, strong ability to reduce and eliminate whitening, can significantly refine grains, increase the number of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 梁红
Owner 大连核心铸造技术工程研究所
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