SiC whisker toughened ultrafine hard alloy and preparation method and application thereof

A cemented carbide and toughening technology, applied in the field of cemented carbide, can solve the problems of unsuitable high-performance woodworking saw teeth, blades, insufficient bending strength, toughness, unfavorable for popularization and use, etc., to achieve good corrosion resistance, improve The effect of high bending strength, toughness and tensile strength

Inactive Publication Date: 2020-03-27
ZHUZHOU JINGGONG CEMENTED CARBIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent application No. 200510032406.9 discloses a method for preparing ultra-high hardness ultra-fine cemented carbide. The hardness of the ultra-fine cemented carbide announced by this method can reach 2550HV30, but the bending strength is insufficient, only 1300-1800MPa, which is only suitable for Finished seals, valves or nozzles under corrosive or abrasive conditions. In addition, the sintering temperature of the alloy is required to reach 1650-1830°C, which requires high equipment and is not conducive to popularization and use.
Other ultra-fine cemented carbides with ultra-high hardness in the prior art are mostly in the category of ultra-fine cemented carbides without a binder phase. Although the hardness is high, the bending strength and toughness are insufficient, so they are not suitable for high-performance woodworking. Sawtooth, blade use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A SiC whisker-toughened ultra-fine cemented carbide of the present invention, comprising the following components by mass content: tungsten carbide: 74.62%, tungsten-tantalum complex carbide: 22.0%, cobalt: 1.5%, nickel: 0.5%, dicarbide Trichromium: 0.45%, vanadium carbide: 0.3%, silicon carbide: 0.5%, yttrium: 0.05%, and lanthanum: 0.08%.

[0036] The preparation method of the SiC whisker toughened ultrafine cemented carbide of the present embodiment comprises the following steps:

[0037] (1) Weigh 149.24Kg WC powder (Fischer particle size 0.3μm), 44Kg tungsten-tantalum compound carbide (particle size less than 1μm), 3Kg cobalt powder (near spherical, Fisher particle size 0.6μm), 1Kg nickel hydroxide powder, 0.9KgCr 3 C 2 , 0.6KgVC, 1KgSiC whisker, 0.43KgY (NO 3 ) 3 ·6H 2 O, 0.5KgLa(NO 3 ) 3 ·6H 2 0. 90 liters of absolute ethanol and 1400Kg cemented carbide ball mill rods are added to the ball mill, mixed and wet milled for 100h;

[0038] (2) After the mixture...

Embodiment 2

[0041]A SiC whisker toughened ultra-fine cemented carbide of the present invention, comprising the following components by mass content: tungsten carbide: 69.67%, tungsten-tantalum complex carbide: 27%, cobalt: 1.5%, nickel: 0.5%, dicarbide Trichromium: 0.40%, vanadium carbide: 0.30%, silicon carbide: 0.5%, yttrium: 0.05%, and lanthanum: 0.08%.

[0042] The preparation method of the SiC whisker toughened ultrafine cemented carbide of the present embodiment comprises the following steps:

[0043] (1) Weigh 139.34Kg WC powder (Fischer particle size 0.4μm), 54Kg tungsten-tantalum compound carbide (particle size less than 1μm), 3KgCo powder (near spherical, Fisher particle size 0.6μm), 1KgNi, 0.8Kg Cr 3 C 2 , 0.6KgVC, 1KgSiC whisker, 0.43KgY (NO 3 ) 3 ·6H 2 O, 0.5KgLa(NO 3 ) 3 ·6H 2 0. 90 liters of absolute ethanol and 1400Kg cemented carbide ball mill rods are added to the ball mill, mixed and wet milled for 100h;

[0044] (2) After the mixture in step (1) is sieved, drie...

Embodiment 3

[0047] A SiC whisker-toughened ultra-fine cemented carbide of the present invention, comprising the following components by mass content: tungsten carbide: 66.72%, tungsten-tantalum complex carbide: 30%, cobalt: 1.5%, nickel: 0.5%, dicarbide Trichromium: 0.35%, vanadium carbide: 0.3%, silicon carbide: 0.5%, yttrium: 0.05%, and lanthanum: 0.08%.

[0048] The preparation method of the SiC whisker toughened ultrafine cemented carbide of the present embodiment comprises the following steps:

[0049] (1) Weigh 133.44Kg WC powder (Fischer particle size 0.4μm), 60Kg tungsten-tantalum compound carbide (particle size less than 1μm), 3KgCo powder (near spherical, Fisher particle size 0.6μm), 1KgNi, 0.7Kg Cr 3 C 2 , 0.6KgVC, 1KgSiC whisker, 0.43KgY (NO 3 ) 3 ·6H 2 O, 0.5KgLa(NO 3 ) 3 ·6H 2 0, 90 liters of absolute ethanol, 1400Kg cemented carbide ball mill rod join ball mill, mixed wet mill 100h;

[0050] (2) After the mixture in step (1) is sieved, dried, pressed and formed, it ...

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Abstract

The invention discloses a SiC whisker toughened ultrafine hard alloy. The ultrafine hard alloy comprises the following components by weight: 65.0-77.0 parts of tungsten carbide, 20.0-30.0 parts of tungsten-tantalum compound carbide, 1.0-2.0 parts of cobalt, 0.3-0.8 part of nickel, 0.3-0.8 part of chromium carbide, 0.1-0.5 part of vanadium carbide, 0.1-0.6 part of silicon carbide whisker and 0.05-0.5 part of rare earth. The invention further discloses a corresponding preparation method of the SiC whisker toughened ultrafine hard alloy. The bending strength of the hard alloy reaches 2,400 MPa orabove under the condition that extremely high hardness (reaching 2,300 HV3 or above) is guaranteed, the hard alloy has good corrosion resistance, and the application of the superfine hard alloy in woodworking sawteeth and cutters is met.

Description

technical field [0001] The invention relates to the field of hard alloys, in particular to a woodworking sawtooth with ultra-high hardness and high corrosion resistance, an ultrafine hard alloy for knives, a preparation method and an application thereof. Background technique [0002] Ultra-fine-grained tungsten carbide-cobalt cemented carbide has high hardness and high strength "double high" performance, and is mainly used in the production of micro-drills and milling cutters for integrated circuit boards, printing needles for dot-matrix printers, overall hole processing tools, woodworking Tools, precision molds, dental drills, cutting tools for difficult-to-machine materials, etc. [0003] Ultra-fine tungsten carbide-cobalt cemented carbide is relatively fine-grained and sub-fine-grained tungsten carbide-cobalt cemented carbide, and its hard phase grain size is less than 0.5 μm. Ultra-fine-grained cemented carbide has higher hardness and higher flexural strength than ordin...

Claims

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Application Information

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IPC IPC(8): C22C47/14C22C49/02C22C49/14C22C101/14
CPCC22C47/14C22C49/02C22C49/14
Inventor 陈明吴凤飞张志娟
Owner ZHUZHOU JINGGONG CEMENTED CARBIDE
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