Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of Cr2C3-Ni hard alloy

A technology of cr2c3-ni and cemented carbide, which is applied in the field of preparation of cemented carbide and can solve problems such as unstable properties of alloy materials

Inactive Publication Date: 2019-06-04
祁阳华瑞特种材料有限公司
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem of unstable alloy material properties caused by decarburization and carburization in the existing cemented carbide sintering process, the present invention provides a Cr2C3-Ni cemented carbide carbon correction sintering method, aiming at balancing Sintering decarburization and carburizing to improve the performance of cemented carbide

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] When batching, prepare two mixtures according to the carbon content of 6.10% (lower than the theoretical standard carbon content of 6.128%) and 6.13%, respectively, and obtain 100 pieces of compacted green bodies through wet grinding, spray drying and compression molding;

[0027] Step (1) Forming agent: batching, wet grinding, spray drying, and compression molding to obtain a pressed green body; place the green body in an integrated sintering furnace from room temperature to 600°C at a heating rate of 3°C / min Keep warm for 30min, during which H2 is introduced at a rate of 40L / min;

[0028] Step (2):

[0029] Carry out carbon content correction at 900°C under a mixed atmosphere of CH4:H2 of 1:99, wherein the flow rate of the mixed atmosphere is 40L / min; then the temperature is raised to 1100°C at a heating rate of 3.3°C / min and kept warm 120min, during the heat preservation period, feed CH4: H2 is a mixed gas of 1:99, and the flow rate of said mixed gas is 40~80L / min; ...

Embodiment 2

[0034] Step (1) Forming agent: batching, wet grinding, spray drying, and compression molding to obtain a pressed green body; place the green body in an integrated sintering furnace from room temperature to 700°C at a heating rate of 3°C / min Keep warm for 30min, during which H2 is introduced at a rate of 40L / min;

[0035] Step (2):

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

[0037] Step (3): Vacuum and pressure sintering: sintering in a vacuum state in a pressure sintering furnace, the process parameters are: 1300 ° C pre-sintering section for 120 minutes; 1400 ° C pressure sintering section for 50 minutes, the pressure of the pressure sintering proc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of powder metallurgy, and particularly provides a preparation method of Cr2C3-Ni hard alloy. The Cr2C3-Ni hard alloy is prepared through the following steps of performing batching, performing wet milling, performing drying, mixing a binder, performing press forming, removing the binder and performing sintering. According to the preparation method disclosed by theinvention, through a special heating curve and control of air current and the control of flow rate during the preparation course, the decarburization and carburization can be effectively balanced, sintering is improved, and the quality of the obtained products is stable.

Description

technical field [0001] The invention relates to a preparation method of cemented carbide, in particular to a Cr 2 C 3 -The preparation method of Ni cemented carbide, specifically, the carbon content correction is carried out in the sintering process. Background technique [0002] Cemented carbide is one or more high hardness, high modulus refractory metal carbides (Ti C, Cr 2 C 3 ) is a multiphase composite material composed of transition metals (Fe, Co, Ni, etc.) or other alloys as the binder phase. This kind of composite structural material has the high hardness, high wear resistance, and red hardness of ceramics, as well as the high strength and toughness of metals; and this specific "double high" performance is exactly the goal pursued by material researchers. [0003] The main task of quality control in the production of cemented carbide is to obtain the best microstructure of the alloy (that is, two-phase structure, no decarburization, no carburization, relative ma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F3/14C22C29/06C22C1/05
Inventor 郭国华
Owner 祁阳华瑞特种材料有限公司