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Composition composed of metal and ceramic and its preparation method, cermet and Raymond mill

A technology of cermet and composition, applied in the field of cermet, can solve the problems of high cost, poor wear resistance and toughness of cermet, and achieve the effects of low cost, good toughness, high hardness and wear resistance

Inactive Publication Date: 2012-03-14
湖南永锐材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems of high cost, poor wear resistance and poor toughness of cermets existing in the prior art

Method used

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  • Composition composed of metal and ceramic and its preparation method, cermet and Raymond mill

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Effect test

preparation example Construction

[0047] The present invention provides a cermet. The preparation method of the cermet includes the following steps:

[0048] 1) Press mold the cermet composition to obtain a green body, and bake;

[0049] 2) The baked green body is subjected to isostatic pressure sintering under anaerobic conditions, the sintering pressure is 100-400 MPa, and the sintering temperature is 900-2000°C.

[0050] In the present invention, the cermet composition is a paste, and the paste is press-molded to obtain a green body, which is then transferred to an oven for baking. The baking temperature is 200-350℃, and the heating rate during baking is 10℃ / min.

[0051] Under anaerobic conditions, the baked green body is transferred to an isostatic press for isostatic sintering. Isostatic pressing sintering is well known to those skilled in the art, and includes putting the sample to be burned into the jacket of an isopressing machine, and performing hot isostatic pressing sintering according to a certain heatin...

Embodiment 1

[0058] (1) Mix the inorganic powder material evenly according to the ratio shown in Table 1, and transfer it to a stirring ball mill for 2 hours. The particle size of the inorganic powder material is 0.5-2μm; then add paraffin wax and coal tar (the mass ratio is 1:3 ), mixed uniformly to prepare a paste to obtain the cermet composition S1 of this embodiment.

[0059] (2) The cermet composition S1 is press-molded into a green body, and then placed in an oven for baking. The temperature rise curve is: heating from room temperature to 300°C, and the heating rate is 10°C / min.

[0060] (3) Put the baked green body into the jacket of the isopressor, and perform hot isostatic pressing sintering under oxygen-free conditions; where the pressure transmission medium is nitrogen, the jacket material is glass, and the sintering pressure is 150MPa ; Sintering temperature conditions: the heating temperature is set to 950℃, and the holding time is 1h; then it is heated to 1700℃ and the holding tim...

Embodiment 2

[0062] The cermet composition and cermet of this embodiment were prepared by the same steps as in embodiment 1, except that:

[0063] In step (1), the ratio of each raw material is shown in Table 1;

[0064] In step (2), the heating curve is: heating from room temperature to 350°C, and the heating rate is 10°C / min;

[0065] In step (3), the sintering conditions include: the pressure transmission medium is helium, the jacket material is glass, and the sintering pressure is 250 MPa; the sintering temperature conditions: the heating temperature is set to 900 ℃, the holding time is 1.5 h; and then heating to 1850 ℃, keep for 4h.

[0066] Through the above steps, the cermet of this embodiment is obtained, denoted as S22.

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Abstract

The invention provides a composition composed of metal and ceramic, based on the total mass of the composition composed of metal and ceramic, the composition composed of metal and ceramic comprises the following ingredients: 40-60wt% of silicon carbide with 0.5-2 mum of particle size, 2-10%wt% of Corhart standard, 10-20wt% of tungsten powder, 1-5wt% of iron powder, 0.5-6wt% of chromium powder, 2-8wt% of manganese oxide, 8-15wt% of paraffin and coal tar. The cermet prepared by the composition composed of metal and ceramic has the advantages of high hardness and wear resistance of ceramic and toughness of alloy. In addition, the composition composed of metal and ceramic of the present invention has the characteristics of less molybdenum powder amount and low cost.

Description

Technical field [0001] The invention belongs to the field of cermet materials, and in particular relates to a cermet composition and a preparation method thereof, a cermet and a Raymond mill. Background technique [0002] Raymond mills are generally used to grind and prepare ultra-fine powder materials, and are widely used in the processing of non-metallic mineral products such as mining, chemicals, building materials and metallurgy. Grinding rollers and grinding rings are the main consumable spare parts for Raymond Mills. High manganese steel has good strength and toughness, and has excellent deformation and hardening ability, so it has long been used as a material for manufacturing grinding rollers and grinding rings. However, when grinding rollers and rings made of high-manganese steel materials are used to grind high-hardness materials, they have the shortcomings of short service life, frequent replacement of spare parts, and large consumption. As a result, the Raymond mill ...

Claims

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Application Information

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IPC IPC(8): C22C29/06C22C1/05B02C4/30
Inventor 李红秦世嵘林宏业
Owner 湖南永锐材料科技有限公司
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