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Ceramic cutting tool with ultrahigh strength and ultrahigh toughness, and preparation method thereof

A ceramic knife and ultra-high toughness technology, which is applied in the field of ceramic products, can solve the problems of inability to achieve mechanical properties and material density, and achieve the effects of small friction, safe and environmentally friendly production materials, and improved performance

Active Publication Date: 2013-07-17
FOSHAN CERAMICS RES INST GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent adopts plasma high-temperature sintering process to improve the strength and toughness of ceramic tools to a certain extent, it cannot achieve sufficient density of the material and cannot meet sufficient mechanical performance requirements, and its hardness and bending strength need to be further improved. and fracture toughness

Method used

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  • Ceramic cutting tool with ultrahigh strength and ultrahigh toughness, and preparation method thereof
  • Ceramic cutting tool with ultrahigh strength and ultrahigh toughness, and preparation method thereof
  • Ceramic cutting tool with ultrahigh strength and ultrahigh toughness, and preparation method thereof

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preparation example Construction

[0055] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing an ultra-high-strength ultra-high-toughness ceramic cutting tool, including:

[0056] S101, pre-pressing the pretreated powder to obtain a semi-finished tool.

[0057] During the pre-press molding process of the pretreated powder, the pre-press molding pressure is 30-200T.

[0058] Preferably, the pre-press molding pressure is 38T.

[0059] S102, performing low-temperature heat treatment on the pre-pressed semi-finished tool, wherein the temperature of the low-temperature heat treatment is 500-950°C.

[0060] Preferably, the temperature of the low temperature heat treatment is 600°C to 800°C.

[0061] S103, performing hot-press vibration sintering on the semi-finished tool that has undergone low-temperature heat treatment, wherein the temperature of the hot-press vibration sintering is 1300-1680°C.

[0062] Preferably, the temperature of hot-press vibration sintering i...

Embodiment 1

[0109] Mix 91% zirconia, 6% yttrium oxide, and 3% rare earth oxide, and add an adhesive polyvinyl alcohol aqueous solution for mixing and granulation. The mixed and granulated raw materials are dry-pressed by a press. The nominal pressure is 38T, and the semi-finished tool is obtained. The semi-finished tool is subjected to low-temperature heat treatment at 760°C. The above-mentioned semi-finished tool that has undergone low-temperature heat treatment is subjected to hot-press vibration sintering. The temperature of the hot-press vibration sintering is 1400°C, the pressure is 30MPa, the vibration amplitude is 1T, and the frequency is 1 time / s. Grinding and polishing the above-mentioned semi-finished tool that has been sintered by hot pressing and vibration to obtain a finished tool.

Embodiment 2

[0111] Mix 92% zirconia, 5% yttrium oxide, and 3% rare earth oxide, and add an adhesive polyvinyl alcohol aqueous solution for mixing and granulation. The mixed and granulated raw materials are dry-pressed by a press. The nominal pressure is 38T, and the semi-finished tool is obtained. The semi-finished tool is subjected to low-temperature heat treatment at 800°C. The above-mentioned semi-finished tool that has undergone low-temperature heat treatment is subjected to hot-press vibration sintering. The temperature of the hot-press vibration sintering is 1470°C, the pressure is 40MPa, the vibration amplitude is 2T, and the frequency is 1 time / s. Grinding and polishing the above-mentioned semi-finished tool that has been sintered by hot pressing and vibration to obtain a finished tool.

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Abstract

The invention discloses a ceramic cutting tool with ultrahigh strength and ultrahigh toughness. The ceramic cutting tool with ultrahigh strength and ultrahigh toughness is prepared by a hot-press vibratory sintering process by using zirconium oxide, yttrium oxide and a rare earth oxide as main raw materials. Accordingly, the invention also discloses a preparation method of the ceramic cutting tool with ultrahigh strength and ultrahigh toughness. The preparation method comprises the steps of prepressing molding preprocessed powder to obtain a semi-finished cutting tool; performing low temperature heat treatment on the semi-finished cutting tool; hot-press vibratory sintering the semi-finished cutting tool processed by the low temperature heat treatment; and polishing and burnishing the semi-finished cutting tool processed by the hot-press vibratory sintering process to obtain the ceramic cutting tool with ultrahigh strength and ultrahigh toughness. Due to the adoption of the preparation method, the cutting toll has high hardness, good wear resistance and excellent thermal shock resistance, high bending strength and high fracture toughness. The cutting tool has obvious advantages in thermal conductivity, corrosion resistance, antioxidant activity, high temperature hardness, high temperature strength, etc.

Description

technical field [0001] The invention relates to the field of ceramic products, in particular to an ultra-high-strength and ultra-high-toughness ceramic cutter and a preparation method thereof. Background technique [0002] Cutting occupies an important position in the field of mechanical processing, and it is the most basic and reliable processing method. The performance of the cutting tool is one of the decisive factors affecting the cutting efficiency, precision and surface quality. A research report of the International Machinery Production Technology Research Association (CIRP) pointed out: "The emergence of each new tool material will make the ability and level of machining a big step forward." Tool material is the most important factor affecting cutting technology, while tool geometry parameters and tool structure are secondary factors. The development of cutting tool materials over the past century has evolved from carbon tool steel, high-speed steel, cemented carbi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/645C04B35/622
Inventor 冯斌刘桔英钟小棵熊建华李小燕周耀
Owner FOSHAN CERAMICS RES INST GRP CO LTD
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