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Boron carbide-tungsten carbide composite ceramic gradient material for tool as well as preparation method and application of boron carbide-tungsten carbide composite ceramic gradient material

A gradient material and composite ceramic technology, applied in the direction of reducing greenhouse gases, nuclear power generation, and climate sustainability, can solve problems such as poor high-temperature performance and difficult-to-process materials, so as to improve tool life, enhance interlayer bonding, and alleviate Effect of Gradient Stress

Active Publication Date: 2020-09-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Tungsten carbide has high melting point, high hardness, high elastic modulus, high compressive strength and other characteristics, and has good oxidation resistance and corrosion resistance; WC and cobalt (Co) composite material (tungsten carbide) has excellent Strength and toughness are widely used in the field of cutting tools, but its hardness is lower than that of boron carbide. Due to the presence of high content of cobalt, the high temperature performance is poor, and it is insufficient in the field of high-speed cutting of difficult-to-machine materials.

Method used

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  • Boron carbide-tungsten carbide composite ceramic gradient material for tool as well as preparation method and application of boron carbide-tungsten carbide composite ceramic gradient material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Preparation: (1) boron carbide (B 4 C) powder and tungsten carbide (WC) powder according to the volume fraction ratio is 90%: 10% carry out batching, with ethanol as solvent, YG6 (WC-6wt% Co) hard alloy ball is ball milling medium in roller ball mill with 150r / min mixing for 8 hours, after mixing, ultrasonic dispersion and drying, B 4 C-WC micron composite powder, marked as BCWC1; boron carbide (B 4 C) powder and tungsten carbide (WC) powder are mixed according to the volume fraction ratio of 20%:80%, with ethanol as solvent and YG6 cemented carbide balls as ball milling medium in a roller ball mill at 150r / min for 8h, after mixing , ultrasonic dispersion, and drying, to obtain B 4 C-WC micron composite powder, marked as BCWC2;

[0034] (2) The surface layer of the ceramic gradient material uses BCWC1 as the raw material and Co (cobalt) powder as the binder; according to the volume fraction ratio of BCWC1: Co of 98%: 3%, the mixed powder obtained after mixing a...

Embodiment 2

[0040] 1. Preparation: (1) boron carbide (B 4 C) Powder and tungsten carbide (WC) powder are mixed according to the volume fraction ratio of 100:0, with ethanol as the solvent and YG6 cemented carbide balls as the ball milling medium in a roller ball mill at 150r / min for 8h, after mixing material, ultrasonic dispersion, and drying, to obtain B 4 C-WC micron composite powder, marked as BCWC1; boron carbide (B 4 C) powder and tungsten carbide (WC) powder are mixed according to the volume fraction ratio of 30%: 70%, with ethanol as solvent and YG6 cemented carbide ball as ball milling medium in a roller ball mill at 150r / min for 8h, After mixing, ultrasonic dispersion and drying, B 4 C-WC micron composite powder, marked as BCWC2;

[0041] (2) The surface layer of the ceramic gradient material uses BCWC1 as a raw material and Co (cobalt) powder as a binder; according to the ratio of BCWC1: Co volume fraction of 100%: 0%, after mixing and drying, the obtained Mixed powder, m...

Embodiment 3

[0047] 1. Preparation: (1) boron carbide (B 4 C) Powder and tungsten carbide (WC) powder are mixed according to the volume ratio of 70%: 30%, with ethanol as solvent and YG6 cemented carbide ball as ball milling medium in a roller ball mill at 150r / min for 8h, After mixing, ultrasonic dispersion and drying, B 4 C-WC micron composite powder, marked as BCWC1; boron carbide (B 4 C) Powder and tungsten carbide (WC) powder are mixed according to the volume fraction ratio of 5%: 95%, with ethanol as solvent and YG6 cemented carbide ball as ball milling medium in a roller ball mill at 150r / min for 8h, After mixing, ultrasonic dispersion and drying, B 4 C-WC micron composite powder, marked as BCWC2;

[0048] (2) The surface layer of the gradient tool material uses BCWC1 as a raw material and Co (cobalt) powder as a binder; according to the ratio of BCWC1: Co volume fraction of 95%: 5%, after mixing and drying, a mixed Powder, marked as BCWC1-Co, the mixing step is the same as s...

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Abstract

The invention belongs to the technical field of cutting tools, and discloses a boron carbide-tungsten carbide composite ceramic gradient material for a tool and a preparation method and application ofthe boron carbide-tungsten carbide composite ceramic gradient material. The surface layer of the ceramic gradient material comprises 70-100 vol% of B4C and 0-5 vol% of Co, wherein the core part of the ceramic gradient material contains 50-95 vol% of WC and 5-20 vol% of Co; the relative density of the material is higher than 97%, the hardness of the surface layer is 20-35 GPa, and the fracture toughness of the surface layer is 3-10 MPa.m < 1 / 2 >. The hardness of the core part is 14-22 GPa, and the fracture toughness of the core part is 8-20 MPa.m < 1 / 2 >. By controlling the contents of boron carbide, tungsten carbide and metal cobalt on the surface and the core, the hard-surface tough-core high-performance boron carbide-tungsten carbide composite ceramic gradient material is prepared by hot pressed sintering. The composite ceramic gradient material has very high surface hardness, wear resistance and good tipping fracture resistance.

Description

technical field [0001] The invention belongs to the technical field of composite gradient ceramics, and in particular relates to a boron carbide-tungsten carbide composite ceramic gradient material used for cutting tools and its preparation method and application. Background technique [0002] At present, the main tools used for high-speed cutting include cemented carbide tools, ceramic tools, cermet tools, cubic boron nitride and diamond tools. These tools are usually applied with a homogeneous structure so that the cutting edge matches the material composition and microstructure of the substrate. However, because the cutting tool requires the cutting edge to have high hardness and high heat resistance, and the tool substrate is required to have high strength, high toughness, high thermal conductivity and good dimensional stability, it is difficult for homogeneous tools to achieve the optimum core and substrate. Best performance. To solve these problems, researchers devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/563C04B35/622C04B35/626C04B35/63
CPCC04B35/563C04B35/622C04B35/6261C04B35/62655C04B35/6303C04B2235/75C04B2235/3847C04B2235/405C04B2235/5445C04B2235/5436C04B2235/96Y02E30/30
Inventor 郭伟明谭大旺周宇章林华泰
Owner GUANGDONG UNIV OF TECH
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