A kind of industrialized preparation method of wc-12co cemented carbide with ultrahigh bending strength

A technology of bending strength and cemented carbide, which is applied in the field of cemented carbide, can solve problems such as the difficulty in preparing cemented carbide bulk materials, reduce the probability of micro-crack nucleation and expansion, and achieve high precision of composition control. The effect of reducing the influence of flexural strength

Active Publication Date: 2015-11-18
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] Due to the difficulty of breaking through the scientific and technological bottlenecks of the precise control of carbon content and the optimal combination of inhibitor addition types, particle sizes, and content, etc., it is currently difficult to prepare ultra-high-strength cemented carbide with a flexural strength exceeding 4500 MPa. bulk material

Method used

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  • A kind of industrialized preparation method of wc-12co cemented carbide with ultrahigh bending strength
  • A kind of industrialized preparation method of wc-12co cemented carbide with ultrahigh bending strength
  • A kind of industrialized preparation method of wc-12co cemented carbide with ultrahigh bending strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] with WO 2.9 、Co 3 o 4 and carbon black as raw materials, according to the relationship between the composition of the cemented carbide and the relative magnetic saturation value, the carbon content in the raw material powder is regulated, so that the relative magnetic saturation value of the prepared cemented carbide bulk material is 83%, The above three raw material powders are mixed by ball milling, and the mixed powder is cold-pressed into a compact and sent to a vacuum furnace. The following process parameters are used to prepare WC-12Co composite powder in the vacuum furnace: heating rate 4°C / min, reaction temperature 950°C , the holding time is 3 hours;

[0021] For Cr with micron particle size 3 C 2 The powder is pretreated by ball milling, using absolute ethanol as the grinding medium, the mass ratio of the grinding ball to the powder is 3:1, the volume ratio of the grinding medium to the material is 1:1, and the ball milling time is 100 hours;

[0022] The...

Embodiment 2

[0026] with WO 2.9 、Co 3 o 4 and carbon black as raw materials, the carbon content in the raw material powder is regulated according to the relationship between the composition of the cemented carbide and the relative magnetic saturation value, so that the relative magnetic saturation value of the prepared cemented carbide bulk material is 85%, The above three raw material powders are mixed by ball milling, and the mixed powder is cold-pressed into a compact and sent to a vacuum furnace. The following process parameters are used to prepare WC-12Co composite powder in the vacuum furnace: heating rate 10°C / min, reaction temperature 1100°C , the holding time is 2 hours;

[0027] For Cr with micron particle size 3 C 2 The powder is pretreated by ball milling, using absolute ethanol as the grinding medium, the mass ratio of the grinding ball to the powder is 5:1, the volume ratio of the grinding medium to the material is 1:1, and the ball milling time is 80 hours;

[0028] The...

Embodiment 3

[0032] with WO 2.9 、Co 3 o 4 and carbon black as raw materials, according to the relationship between the composition of the cemented carbide and the relative magnetic saturation value, the carbon content in the raw material powder is regulated, so that the relative magnetic saturation value of the prepared cemented carbide bulk material is 84%, The above three raw material powders are mixed by ball milling, and the mixed powder is cold-pressed into a compact and sent to a vacuum furnace. The following process parameters are used to prepare WC-12Co composite powder in the vacuum furnace: heating rate 7°C / min, reaction temperature 1050°C , the holding time is 3 hours;

[0033] The VC powder with a particle size of 1.0-2.0 microns was ball milled and mixed with the prepared WC-12Co composite powder. The amount of VC powder added was 0.3wt.%. Anhydrous ethanol was used as the grinding medium, and the mass ratio of the ball to the powder was 4:1, the volume ratio of grinding me...

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Abstract

The invention relates to an industrialized preparation method of a WC-12Co hard alloy with ultrahigh bending strength, and belongs to the technical field of hard alloy. By taking tungsten oxides, cobalt oxides and carbon black as raw materials, the method comprises the following steps: first, preparing WC-12Co compound powder by an in-situ reaction synthetic method, wherein the relative magnetic saturation of corresponding hard alloy block material is 83-85%; carrying out a ball-milling pre-treatment on a grain growth inhibitor, then ball-milling and mixing the compound powder by in-situ synthesis, and compression moulding and low-pressure sintering to prepare the hard alloy block material. Through optimal design of type, content, grain size and the like of the added grain growth inhibitor, the WC-12Co hard alloy with ultrahigh bending strength is prepared. The whole preparation of the invention can be used for batch production of WC-12Co hard alloy with ultrahigh strength, and the method provided by the invention has an important practical value to scientific research and industrial production of high performance hard alloys.

Description

technical field [0001] The invention relates to an industrialized preparation method of WC-12Co hard alloy with ultrahigh bending strength, belonging to the technical field of hard alloy. Background technique [0002] WC-Co cemented carbide has been widely used in cutting tools, moulds, mining tools and wear-resistant parts due to its high hardness and wear resistance. In recent years, with the replacement of materials, the processing objects of cemented carbide tools have changed from general materials to high-hardness and high-strength alloys that are difficult to machine. For example, carbon steel is replaced by special high-strength steel, and cast iron is replaced by high-quality casting alloys. etc.; at the same time, there is a large demand for cemented carbide tools and molds with excellent comprehensive performance in the current high-tech fields, especially in high-end industrial applications such as aerospace, microelectronics, and micro-engraving. There is an urg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/08C22C1/05
Inventor 宋晓艳刘兴伟刘雪梅王海滨郭广生
Owner BEIJING UNIV OF TECH
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