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A kind of preparation method of wc-co-cbn composite material

A composite material, wc-co-cbn technology, is applied in the field of preparation of WC-Co-cBN composite materials, and achieves the effects of low sintering temperature, low energy consumption and short sintering time

Active Publication Date: 2016-05-11
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of cemented carbide materials by hot pressing and sintering has become a feasible means of industrial production, but there are still few reports on the synthesis of WC-Co-cBN composite materials by hot pressing and sintering, and most foreign reports are hot isostatic pressing (Martinez, V, etal .Spain) or put some plasma sintering (Yaman,B, etal .Turkey) to prepare WC-Co-cBN composite materials, and there is only a literature report published in April 2007 by the State Key Laboratory of Materials Compositing Technology, Wuhan University of Technology (WC-Co-cBN composite materials prepared by hot pressing), they The research is cBN (0.15~0.375mm) coated with titanium on the surface, and the effect of hot pressing and sintering at 1380°C on the properties of WC-Co-cBN composites

Method used

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  • A kind of preparation method of wc-co-cbn composite material
  • A kind of preparation method of wc-co-cbn composite material
  • A kind of preparation method of wc-co-cbn composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) First weigh WC, metal Co powder and cBN raw materials in proportion, the mass ratio of WC and metal Co is 94:6, cBN accounts for 3% of the raw material volume fraction, and after uniform mixing, the mixture is mixed by ball milling, and the ball milling medium is Water ethanol, balls are Al 2 o 3 Balls, the ball milling time is 20 hours, and the mixing speed is 250 rpm;

[0027] (2) Dry the raw materials mixed by ball milling in an oven at 100°C, and then pass through a 200-mesh sieve before use;

[0028] (3) After putting the dried raw materials into the mold, place them in a hot-press sintering furnace. The sintering furnace heats up to 1280°C at a speed of 50°C / min, and keeps the temperature for 15 minutes, and the pressure is kept at 30MPa to obtain WC-Co-cBN composite material.

[0029] Its SEM picture is as follows figure 1 (a) and figure 2 As shown, it can be seen from the figure that cBN is evenly distributed on the cemented carbide substrate, and the...

Embodiment 2

[0032] (1) First weigh WC, metal Co powder and cBN raw materials in proportion, the mass ratio of WC and metal Co is 97:3, cBN accounts for 5% of the raw material volume fraction, and use ball milling after uniform mixing. The ball milling medium is Water ethanol, balls are Al 2 o 3 Balls, the ball milling time is 15 hours, and the mixing speed is 350 rpm;

[0033] (2) Dry the raw materials mixed by ball milling in an oven at 50°C, and then pass through a 100-mesh sieve before use;

[0034] (3) After putting the dried raw materials into the mold, place them in a hot-press sintering furnace. The sintering furnace is heated up to 1200°C at a speed of 30°C / min, and kept for 30 minutes, and the pressure is kept at 50MPa to obtain WC-Co-cBN composite material.

[0035] Its SEM picture is as follows figure 1As shown in (b), it can be seen from the figure that the cBN is evenly distributed on the cemented carbide substrate, and the cBN in the plan view is polygonal, indicating t...

Embodiment 3

[0038] (1) First weigh WC, metal Co powder and cBN raw materials in proportion, the mass ratio of WC and metal Co is 90:10, cBN accounts for 7% of the raw material volume fraction, and after uniform mixing, ball milling is used for mixing, and the ball milling medium is Water ethanol, balls are Al 2 o 3 Balls, the ball milling time is 18 hours, and the mixing speed is 150 rpm;

[0039] (2) Dry the raw materials mixed by ball milling in an oven at 200°C, and then pass through a 300-mesh sieve before use;

[0040] (3) After putting the dried raw materials into the mold, place them in a hot-press sintering furnace. The sintering furnace heats up to 1300°C at a speed of 40°C / min, and keeps the temperature for 5 minutes. The pressure is kept at 20MPa to obtain WC-Co-cBN composite material.

[0041] Its SEM picture is as follows figure 1 (c) and figure 2 It can be seen from the figure that cBN is evenly distributed on the cemented carbide substrate, and the content of cBN gra...

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Abstract

The invention belongs to the technical field of material preparation and in particular relates to a preparation method of a WC-Co-cBN composite material. The preparation method of the WC-Co-cBN composite material comprises the following steps: firstly weighing WC, metal Co powder and cBN raw material in proportion, uniformly mixing, mixing by carrying out ball milling, drying the mixed raw materials in a drying oven at the temperature of 50-200 DEG C, then sieving with a sieve of 100-300 meshes, putting the dried raw materials into a mould, then placing the mould into a hot-pressing sintering furnace, heating the sintering furnace to 1200-1400 DEG C at a speed of 30-50 DEG C / min, insulating for 5-30 minutes, and maintaining pressure to be 20-50MPa, so that the WC-Co-cBN composite material is obtained. The preparation method of the WC-Co-cBN composite material has the advantages that the hot-pressing method is adopted, the sintering temperature is low, sintering time is short, and no phase transformation of cBN can be guaranteed while the WC-Co-cBN composite material has high shrinkage percentage and high volume density; meanwhile, hot pressing energy consumption is low, cost is low, operation is easy, and safety coefficient is high.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method of a WC-Co-cBN composite material. Background technique [0002] Cemented carbide (WC-Co composite material) has excellent properties such as high hardness, strength, good wear resistance and thermal conductivity, and has been widely used in alloy processing, rock drilling exploration, and high-performance abrasive tools. However, with the rapid development of my country's automobile industry, machinery manufacturing, aerospace, military and other fields, there is an urgent need for cemented carbide materials with higher performance and wider application range. However, the "irreconcilable contradiction" in the composite material, that is, the contradiction between hardness and toughness restricts the development of materials. [0003] CBN is called cubic boron nitride, which is a covalent bond compound with high chemical stability, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C29/02
Inventor 岳新艳王建军何超石晓飞茹红强
Owner NORTHEASTERN UNIV LIAONING
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