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Binding-phase TiC/WC composite hard alloy and preparation method thereof

A technology of cemented carbide and binder phase, which is applied in the field of cemented carbide, can solve problems such as the limitation of the application environment of cemented carbide, peeling, the oxidation resistance and corrosion resistance of cemented carbide are not outstanding, and achieve the reduction of density and production Cost, good wear resistance, superior wear and corrosion resistance effect

Active Publication Date: 2014-07-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although Co has its advantages as a binder phase, the oxidation resistance and corrosion resistance of the cemented carbide made of it are not outstanding. When used in an acidic environment, the hard phase will be peeled off due to the failure of the binder phase. , so that the application environment of cemented carbide is limited

Method used

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  • Binding-phase TiC/WC composite hard alloy and preparation method thereof
  • Binding-phase TiC/WC composite hard alloy and preparation method thereof
  • Binding-phase TiC/WC composite hard alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] First, the TiC and WC powders with a uniform particle size of 3-5 μm, which have been screened in advance, are mixed according to the mass fraction of 100% and 0%, and then the mixed TiC / WC powder with a raw material mass percentage of 94% is weighed, and then the mixed TiC / WC powder and Co with a particle size of 1-3μm 2 AlTi powder is prepared according to the mass fraction of 94% and 5%, and 1% of the total mass of stearic acid is added, and then mixed and ground in a ball mill for 12 hours; the mixed and ground raw materials are vacuum-dried and sieved to remove agglomerates body, then granulated, and then at 1000kg / cm 2 Precisely press under the pressure to make a compact; place the prepared compact in a vacuum of 3×10 -4 MPa vacuum sintering furnace heated to 1200 ° C vacuum sintering for 2 hours, followed by hot isostatic pressing at 1200 ° C and 80 MPa for 5 hours to make cemented carbide. Take it out after cooling to get the finished product.

Embodiment 2

[0030]First, the TiC and WC powders with a uniform particle size of 3-5 μm, which have been screened in advance, are prepared and mixed according to the mass fraction of 90% and 10%, and then the mixed TiC / WC powder with a raw material mass percentage of 91% is weighed, and then the mixed TiC / WC powder and Co with a particle size of 1-3μm 2 AlTi powder is prepared according to the mass fraction of 91% and 8%, and 0.9% of the total mass of stearic acid is added, and then mixed and ground in a ball mill for 15 hours; the mixed and ground raw materials are vacuum-dried and sieved to remove agglomerates body, then granulated, and then at 900kg / cm 2 Precisely press under the pressure to make compacts; put the finished compacts in a vacuum of 3.5×10 -4 Heating to 1280°C for vacuum sintering in MPa vacuum sintering furnace for 1.8 hours, followed by hot isostatic pressing at 1230°C and 850MPa for 4.5 hours to make hard alloy. Take it out after cooling to get the finished product. ...

Embodiment 3

[0032] Firstly, the TiC and WC powders with a uniform particle size of 3-5 μm, which have been screened in advance, are mixed evenly according to the mass fraction of 80% and 20%, and then the mixed TiC / WC powder with a raw material mass percentage of 89% is weighed, and then the mixed TiC / WC powder is weighed. WC powder with particle size of 1~3μmCo 2 AlTi powder is prepared according to the mass fraction of 89% and 10%, and 0.8% of the total mass of stearic acid is added, and then mixed and ground in a ball mill for 24 hours; the mixed and ground raw materials are vacuum-dried and sieved to remove agglomerates body, then granulated, and then at 900kg / cm 2 Press under the pressure to make a green compact; place the finished green compact in a vacuum of 4×10 -4 MPa vacuum sintering furnace heated to 1250 ° C vacuum sintering for 1.5 hours, followed by hot isostatic pressing at 1250 ° C and 90 MPa for 2 hours to make cemented carbide. Take it out after cooling to get the fini...

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Abstract

The invention discloses a binding-phase TiC / WC composite hard alloy and a preparation method thereof. The binding-phase TiC / WC composite hard alloy is prepared from the following raw materials in percentage by mass: 84-94% of hard-phase TiC and WC mixed powder, 5-15% of ternary intermetallic compound Co2AlTi powder and 0.5-1% of stearic acid additive, wherein the hard-phase TiC and WC mixed powder serves as a hard phase and has uniform granularity, and the ternary intermetallic compound Co2AlTi powder serves as a binding phase. The method comprises the steps of firstly, mixing and grinding the raw materials in a ball mill; carrying out vacuum drying, then, screening to remove aggregates, then, granulating, and then, pressing at the pressure of 800-1,200kg / cm<2>; putting a prepared pressed shape in a vacuum sintering furnace with the degree of vacuum of 3*10<-4> to 5*10<-4>MPa, heating to the temperature of 1,200-1,350 DEG C, carrying out vacuum sintering for 1-2 hours, then, carrying out hot isostatic pressing treatment for 1-5 hours at the temperature of 1,200-1,350 DEG C and the pressure of 80-100MPa, cooling, and then, taking out, thereby obtaining the hard alloy.

Description

technical field [0001] The invention belongs to the field of hard alloys for wear-resistant and corrosion-resistant parts, and relates to a TiC / WC composite hard alloy and a preparation method thereof. Background technique [0002] Cemented carbide is a kind of cemented carbide prepared by powder metallurgy technology, with high hardness refractory metal carbide (TiC, WC, etc.) Sintered material. The hard phase of cemented carbide makes the material have high hardness, high strength, good wear resistance and heat resistance. The binder phase of the cemented carbide endows the cemented carbide with a certain toughness and deformation ability, so that the cemented carbide can be heat treated. Cemented carbide also has good high temperature performance and is widely used in cutting tool materials, mold materials, oil well drill bits, excavation materials and other fields. As more cemented carbides are developed and their production and processing methods become more economic...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C1/05
Inventor 薛烽武小冕巨佳周健白晶孙扬善严木香孙晶晶
Owner SOUTHEAST UNIV
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