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Preparation method of graded cemented carbide

A technology of cemented carbide and gradient structure, which is applied in the field of preparation of gradient structure cemented carbide, which can solve the problems of easy deformation and cracking of gradient cemented carbide, and achieve the effect of increasing the outer diameter of the product

Inactive Publication Date: 2015-12-09
ZHEJIANG HENGCHENG CEMENTED CARBIDE
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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 provide a preparation method of gradient cemented carbide, which can effectively solve the problem of easy deformation and cracking in the firing process of gradient cemented carbide prepared by the existing construction method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The product whose outer diameter size of brand YG15 has no machining allowance is rounded by cylindrical grinding to form an alloy inner core, and then a ring-shaped ring-shaped alloy compact is pressed with the same brand of alloy powder, and the alloy The inner core and the annular alloy green compact are interference fit to form a nesting part, put the nesting part into the sintering furnace for the first sintering, and fill it with argon after vacuuming, keep a slight positive pressure to prevent air from entering, and the sintering temperature 1250°C, sintering time 2 hours, so that the product shrinks 80-90% of the annular alloy compact, and then vacuumizes for secondary sintering. The sintering temperature is 1430°C, and the sintering time is 1.5 hours. The ring-shaped alloy compact is bonded together, so that the original workpiece without allowance can be processed smoothly.

Embodiment 2

[0015] Press YG8 powder into a cylindrical alloy inner core with a shrinkage coefficient of 1.21, and then press a YG15 circular alloy compact with a shrinkage coefficient of 1.28 to 1.35, and the interference between the two is 100 microns. Interference fit with the annular alloy compact to form a nesting piece, put the nesting piece into the sintering furnace for the first sintering, fill it with argon after vacuuming, keep a slight positive pressure to prevent air from entering, and the sintering temperature is 1280°C , the sintering time is 1.5 hours, so that the annular alloy compact is completed and the product shrinks by 80-90%, and then vacuumed for secondary sintering, the sintering temperature is 1380 ° C, the sintering time is 1.5 hours, it is lowered to room temperature, and the sintering is completed. After sintering, the product is combined There is an interface, and the tensile strength of the interface reaches the tensile strength of the original YG8 alloy.

[...

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Abstract

The invention discloses a preparation method of graded cemented carbide. The preparation method comprises the following steps: an alloy inner core and an annular alloy pressing blank are manufactured, wherein the shrinkage coefficient of the annular alloy pressing blank is larger than that of the alloy inner core, the alloy inner core is embedded in the annular alloy pressing blank in a sleeving manner, and the alloy inner core is in interference fit with the annular alloy pressing blank to form an embedding part; the embedding part is placed in a sintering furnace for first-time sintering, vacuumizing is performed, inert gas is injected, the sintering temperature is 1200-1300 DEG C, the sintering time is 1-3 hours; vacuumizing is performed again for second-time sintering at the sintering temperature of 1380-1470 DEG C with the sintering time of 1-2 hours, cooling to room temperature is carried out, therefore sintering is completed. The preparation method of graded cemented carbide provided by the invention has the advantages as follows: powder with more than two grades is used to be compressed respectively to form pressing blanks with different shrinkage coefficients, and the charging method by enabling two products to be embedded in a sleeving manner is adopted, therefore the outer diameter of the inner part is in fit with the inner diameter of the outer part after sintering, gradient cemented carbide with different grades at the inner part and the outer part is prepared, and the method can be also used for increasing the outer diameter of products.

Description

technical field [0001] The invention relates to a preparation method of gradient structure cemented carbide. Background technique [0002] In the process of using cemented carbide, the internal and external requirements of the product are different, so the performance requirements of the alloy are also different. The gradient cemented carbide is prepared by the structural method. If the two grades of materials are added to the mold separately, so that the inner and outer materials are different, due to the different shrinkage coefficients of the two grades of materials, it will cause cracks during the sintering process, or the product will be seriously deformed after firing. , cannot be processed. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of gradient cemented carbide, which can effectively solve the problem of easy deformation and cracking in the firing process of gradient cemented carbide prepared by the ex...

Claims

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Application Information

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IPC IPC(8): B22F7/06C22C1/04
Inventor 陈军金益民吴晓娜
Owner ZHEJIANG HENGCHENG CEMENTED CARBIDE
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