Method for preparing zirconium boride-tungsten titanium carbide self-lubricating composite ceramic material

A technology of tungsten carbide titanium and composite ceramics, which is applied in the field of engineering materials and can solve problems such as low fracture toughness and limited applications

Inactive Publication Date: 2010-12-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, defects with low fracture toughness clearly limit th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment one: first respectively ZrB 2 The raw material and (W,Ti)C raw material were wet ball milled in absolute ethanol for 100 hours, then dried in a vacuum oven at 150°C for 24 hours and sieved to obtain a relatively uniform fine powder. ZrB with initial refinement 2 As the matrix material, (W, Ti)C is the strengthening phase, ZrO 2 For the toughening phase, add MgO sintering aid; the volume percentage of each component is: ZrB 2 63.0%, (W,Ti)C 30.5%, ZrO 2 5.5%, MgO 1.0%. Pour the prepared mixed raw materials into a beaker with absolute ethanol as the medium, and ultrasonically oscillate and stir for 30 minutes to prevent the materials from agglomerating. The mixed material was wet ball milled with absolute ethanol as the medium for 200 hours, dried in a vacuum oven at 150° C. for 24 hours, and then sieved to obtain uniform and fine-grained composite powder suitable for sintering. Put the mixed composite raw material powder into a high-strength graphite mold...

Embodiment 2

[0012] Embodiment two: first respectively ZrB 2 The raw material and (W,Ti)C raw material were wet ball milled in absolute ethanol for 100 hours, then dried in a vacuum oven at 150°C for 24 hours and sieved to obtain a relatively uniform fine powder. ZrB with initial refinement 2 As the matrix material, (W, Ti)C is the strengthening phase, ZrO 2 For the toughening phase, add MgO sintering aid; the volume percentage of each component is: ZrB 2 54.4%, (W,Ti)C 40.0%, ZrO 2 4.5%, MgO 1.0%. Pour the prepared mixed raw materials into a beaker with absolute ethanol as the medium, and ultrasonically oscillate and stir for 30 minutes to prevent the materials from agglomerating. The mixed material was wet ball milled with absolute ethanol as the medium for 200 hours, dried in a vacuum oven at 150° C. for 24 hours, and then sieved to obtain uniform and fine-grained composite powder suitable for sintering. Put the mixed composite raw material powder into a high-strength graphite mold...

Embodiment 3

[0013] Embodiment three: first respectively ZrB 2 The raw material and (W,Ti)C raw material were wet ball milled in absolute ethanol for 100 hours, then dried in a vacuum oven at 150°C for 24 hours and sieved to obtain a relatively uniform fine powder. ZrB with initial refinement 2 As the matrix material, (W, Ti)C is the strengthening phase, ZrO 2 For the toughening phase, add MgO sintering aid; the volume percentage of each component is: ZrB 2 45.2%, (W,Ti)C 50.0%, ZrO 2 3.8%, MgO 1.0%. Pour the prepared mixed raw materials into a beaker with absolute ethanol as the medium, and ultrasonically oscillate and stir for 30 minutes to prevent the materials from agglomerating. The mixed material was wet ball milled with absolute ethanol as the medium for 200 hours, dried in a vacuum oven at 150° C. for 24 hours, and then sieved to obtain uniform and fine-grained composite powder suitable for sintering. Put the mixed composite raw material powder into a high-strength graphite mo...

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Abstract

The invention relates to a method for preparing a zirconium boride-tungsten titanium carbide self-lubricating composite ceramic material. The material is prepared by adding (W, Ti) C solid solution and ZrO2 powder into a ZrB2 matrix, taking MgO as a sintering aid and performing hot pressing sintering on the materials under the vacuum environment. Matrix phase ZrB2 and enhanced phase (W, Ti) C form a good framework structure by introducing (W, Ti) C solid solution; and the ZrO2 is added so as to improve the toughness of the composite ceramic material by means of the phase change characteristic. The sintering temperature of the ZrB2 is reduced by adding the MgO sintering aid, so that a material with higher compactness is obtained. Self-lubricating function of the zirconium boride-tungsten titanium carbide self-lubricating composite ceramic material can be realized by using the chemical reaction of the composite material under the action of high temperature friction. The method has the characteristics of high hardness, high bending strength, high fracture toughness and the like and is suitable for preparing metal cutting tools, modules, nozzles and the like.

Description

1. Technical field [0001] The invention belongs to the technical field of engineering materials, in particular to a preparation method of a zirconium boride-tungsten carbide titanium self-lubricating composite ceramic material. 2. Background technology [0002] ZrB 2 It is a C32 metalloid structure compound of the hexagonal crystal system. It has high melting point, high hardness, high stability, good electrical conductivity, thermal conductivity and chemical corrosion resistance, so it has a great role in refractory materials, nozzles, cutting tools and mold industries. development prospects. In addition, ZrB 2 It has good neutron control ability and can be used in nuclear industry. But due to ZrB 2 The ceramic material itself is difficult to sinter and densify, and the defects of low bending strength and fracture toughness limit its application range, and often fail due to damage. To improve ZrB 2 Mechanical Properties of Ceramics, Melendez-Martinez Developed ZrB 2 ...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/56C04B35/622
Inventor 李彬邓建新连云崧王红
Owner SHANDONG UNIV
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