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Preparation method of VC-Co-Ni alloy

A vc-co-ni, alloy technology, applied in the field of carbon content correction, VC-Co-Ni alloy preparation, can solve the problems of difficult alloy material performance, instability and other issues

Inactive Publication Date: 2019-06-04
祁阳华瑞特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem of unstable performance of alloy materials caused by decarburization and carburization in the sintering process of existing alloys, the present invention provides a carbon-modified sintering method for VC-Co-Ni alloys, aiming at balancing sintering decarburization , carburizing, improve alloy performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] When compounding, two mixtures were prepared according to the carbon content of 6.10% (less than the theoretical standard carbon content of 6.128%) and 6.13% respectively, and then 100 pieces of pressed green bodies were obtained through wet grinding, spray drying, and compression molding;

[0027] Step (1) Demoulding agent: batching, wet grinding, spray drying, and compression molding to obtain a compacted body; after placing the green body in an integrated sintering furnace from room temperature to 400°C at a heating rate of 3°C / min Insulate for 30 minutes, during which H2 is introduced at a rate of 40L / min; then increase to 600℃ at a heating rate of 2℃ / min for 80 minutes, during which H2 is introduced at a rate of 40L / min;

[0028] Step (2):

[0029] Carry out carbon content correction under a mixed atmosphere of CH4:H2 of 1:99 at 900°C, wherein the flow rate of the mixed atmosphere is 40L / min; then it is heated to 1100°C at a heating rate of 3.3°C / min and kept warm 120min...

Embodiment 2

[0034] Step (1) Demoulding agent: batching, wet grinding, spray drying, and compression molding to obtain a compacted body; after placing the green body in an integrated sintering furnace from room temperature to 400°C at a heating rate of 3°C / min Insulate for 30 minutes, during which H2 is introduced at a rate of 40L / min; then increase to 600℃ at a heating rate of 2℃ / min for 80 minutes, during which H2 is introduced at a rate of 40L / min;

[0035] Step (2):

[0036] Carry out carbon content correction under a mixed atmosphere of 1:99 CH4:H2 at 950°C, wherein the flow rate of the mixed atmosphere is 40L / min; then the temperature is increased to 1200°C at a rate of 3.3°C / min and kept warm 120min, pass CH4:H2 1.5:98.5 mixed gas during the heat preservation period, the flow rate of the mixed gas is 60L / min;

[0037] Step (3): Vacuum and pressure sintering: sintering is carried out in a vacuum state in a pressure sintering furnace, the process parameters are: 1300℃ pre-sintering section ...

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PUM

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Abstract

The invention relates to the field of powder metallurgy, and particularly provides a preparation method of a VC-Co-Ni alloy. The VC-Co-Ni alloy is prepared through wet grinding, drying, forming agentblending, compacting and molding, forming agent removing, and sintering after blending. According to the preparation method of the VC-Co-Ni alloy, through a special heating curve and control of periodairflow and the flow velocity, decarburization and carburization can be effectively balanced, and the stability of the quality of products obtained by sintering is improved.

Description

Technical field [0001] The invention relates to a method for preparing an alloy, in particular to a method for preparing a VC-Co-Ni alloy, in particular to correcting the amount of carbon during the sintering process. Background technique [0002] Alloy is one or more refractory metal carbides with high hardness and high modulus (Ti C, Cr 2 C 3 ) Is a matrix, a multiphase composite material composed of transition metals (Fe, Co, Ni, etc.) or other alloys as the binder phase. This composite structural material has the high hardness, high wear resistance, red hardness of ceramics, and the higher strength and toughness of metal; and this special "double high" performance is the goal pursued by materials researchers. [0003] The main task of quality control in alloy production is to obtain the best structure of the alloy (ie two-phase structure, no decarburization, no carburization, relative magnetic saturation value at the required position; moderate and uniform grain size; small por...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C1/05C22C1/10B22F3/10
Inventor 郭国华
Owner 祁阳华瑞特种材料有限公司