Cutting method of zirconia ceramics

A technology of zirconia ceramics and cutting method, applied in the direction of manufacturing tools, stone processing tools, stone processing equipment, etc., can solve the problems of lack of economical methods, low production efficiency, affecting accuracy, etc., to reduce the difficulty of cutting and cutting efficiency. High, guaranteed hardness effect

Active Publication Date: 2018-03-09
广东达昊科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

When sintering again, about 8% shear strain and 3% to 5% volume expansion will occur, which will affect the accuracy and sometimes crack
[0006] Another method is to directly process the fully sintered zirconia ceramics mainly by grinding. This method has low production efficiency and lacks an economical method to process special-shaped surfaces with complex geometries, such as drilling, slotting, Spherical and curved surfaces etc.
PCD (polycrystalline diamond) tools are generally used for milling of fully sintered zirconia ceramics directly, which is expensive, and the PCD tool becomes graphite at about 800°, softens, and the tool cannot be used

Method used

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Embodiment Construction

[0018] The present invention is described in further detail now in conjunction with embodiment.

[0019] Ceramics made of pure zirconia will change from tetragonal phase to monoclinic phase at about 950°. During high-speed cutting, the temperature in the cutting zone is very high, which can reach or even exceed 950°, so that the fully sintered zirconia ceramics in the cutting zone become monoclinic, and the high temperature has a softening effect on the material. PCBN (polycrystalline cubic boron nitride) tools can maintain high hardness at 1400°, and the price is cheaper than PCD. Through experiments, PCBN cutters are used for high-speed milling of fully sintered zirconia ceramics. The results show that the phase transformation of zirconia ceramics in the cutting area has occurred, and the tool wear has been greatly reduced (compared with PCD tool cutting), and the surface quality of the workpiece after processing better. That is to say, cutting ceramics with PCBN tools at ...

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Abstract

The invention relates to a cutting method for zirconia ceramic. The zirconia ceramic is prepared from zirconia or zirconia added with a stabilizer, wherein the crystal structure of the zirconia ceramic has a tetragonal phase and a monoclinic phase; a temperature of transition of the crystal structure of the zirconia ceramic from the tetragonal phase to the monoclinic phase is a phase-transition temperature; and the zirconia ceramic is cut by virtue of a cutter, and the temperature of a cutting area of the zirconia ceramic is controlled to be kept in a phase-transition temperature range during cutting. According to the cutting method disclosed by the invention, the characteristic that the zirconia ceramic is easy to generate phase transition from the tetragonal phase to the monoclinic phase in the phase-transition temperature range is greatly utilized, and the hardness of the monoclinic phase is low relative to the hardness of the tetragonal phase, thus a cutting difficulty can be reduced after the phase transition, and the cutter is longer in service life and higher in cutting efficiency.

Description

technical field [0001] The invention relates to a cutting method, in particular to a cutting method of zirconia ceramics. Background technique [0002] Zirconia ceramics (completely sintered) are metal oxide ceramic materials with excellent physical and chemical properties. Among various metal oxide ceramic materials, zirconia has the best high-temperature thermal stability and heat insulation performance, and is most suitable for ceramic coatings and high-temperature refractory products; the thermal conductivity of zirconia ceramics is the lowest among common ceramic materials. The thermal expansion coefficient is close to that of metal materials, so it is an important structural ceramic material; zirconia ceramics have high hardness and good wear resistance, and can be used to manufacture knives, molds, bearings, etc.; zirconia ceramics have a stable structure, non-toxic, good Its biocompatibility, corrosion resistance, high mechanical strength and other characteristics a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28D1/00
CPCB28D1/00
Inventor 薛建勋孙全平吴海兵陈前亮许兆美
Owner 广东达昊科技有限公司
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