Strengthening-toughening glass ceramic and preparation method thereof

A glass-ceramic and toughening technology, applied in the field of strengthening and toughening glass-ceramic and its preparation, can solve the problems of poor toughening effect, difficulty in densification, and performance degradation.

Inactive Publication Date: 2013-04-03
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whisker toughening is to disperse the whiskers and mix them with the body powder for uniform sintering, but the disadvantage of this method is that when the content of whiskers is high, densification becomes difficult due to its bridging effect, resulting in a decrease in density and performance decline
Particle toughening is easy to operate, but its toughening effect is not as good as other methods

Method used

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  • Strengthening-toughening glass ceramic and preparation method thereof
  • Strengthening-toughening glass ceramic and preparation method thereof
  • Strengthening-toughening glass ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare toughened glass ceramics according to the following steps: (1) Weigh according to the mass ratio: 60% SiO 2 , 29.4% Li 2 CO 3 , 3.69% of K 2 CO 3 , 2.75% AL 2 o 3 , 1.53% CeO 2 and 3.0% P 2 o 5 A total of 500g is used as an ingredient for subsequent use.

[0023] (2) SiO 2 , Li 2 CO 3 、K 2 CO 3 ,,AL 2 o 3 , CeO 2 ,P 2 o 5 Pour it into a ball mill jar, add 300ml of absolute ethanol, wet ball mill for 8 hours, mix evenly, put it in an oven, and dry it at 80°C for 24 hours to obtain a mixed powder.

[0024] (3) Preheat the quartz crucible in a resistance furnace, pour the mixed powder into the preheated quartz crucible, heat up to 1450°C at a rate of 10 / min, and melt at 1450°C in a program-controlled resistance furnace for 2 hours; Quickly pour into deionized water and quench to obtain glass particles. The obtained glass particles were placed in an agate ball mill jar, added with 300 ml of absolute ethanol and ball milled for 12 hours, and dried...

Embodiment 2

[0027] Prepare toughened glass ceramics according to the following steps: prepare glass powder according to the method in Example 1, mix the glass powder and zirconia powder evenly to form a mixture, wherein the mass percentage of zirconia in the mixture is 2%, The glass powder is the balance; the mixture is put into a prefabricated mold box, and subjected to cold isostatic pressing (250MPa) to form a green body. Carry out crystallization heat treatment on the above green body, start from room temperature to 700°C, the heating rate is 10°C / min, after 5 hours at 700°C, heat up to 900°C, after 5 hours of heat preservation, cool with the furnace, and the toughness is completed Preparation of glass ceramics.

Embodiment 3

[0029] Prepare toughened glass ceramics according to the following steps: prepare glass powder according to the method in Example 1, mix the glass powder and zirconia powder evenly to form a mixture, and the mass percentage of zirconia in the mixture is 3%, The glass powder is the balance; the mixture is put into a prefabricated mold box, and subjected to cold isostatic pressing (250MPa) to form a green body. Carry out crystallization heat treatment on the above green body, start from room temperature to 700°C, the heating rate is 10°C / min, after 5 hours at 700°C, heat up to 900°C, after 5 hours of heat preservation, cool with the furnace, and the toughness is completed Preparation of glass ceramics.

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Abstract

The invention belongs to the field of all-ceramics materials for the dentistry, and discloses a strengthening-toughening glass ceramic and a preparation method thereof. The strengthening-toughening glass ceramic comprises the following components in percentage by mass: 96 to 99% of basic component, and 1.0 to 4.0% of toughening component, wherein the basic component comprises the following components in percentage by mass: 58 to 62% of SiO2, 28 to 30% of Li2CO3, 3.5 to 4.0% of K2CO3, 2.5 to 3.0% of Al2O3, 11.4 to 1.6% of CeO2, and 2.6 to 3.0% of P2O5, and the toughening component is ZrO2.

Description

technical field [0001] The invention belongs to the field of dental all-ceramic materials, and relates to a toughened glass ceramic and a preparation method thereof. Background technique [0002] Over the past few decades, there has been a gradual shift towards metal-free materials for dental restorations. During this period, various new technologies and materials were gradually introduced, among which dental all-ceramic materials are favored by doctors and patients because of their excellent biocompatibility and excellent aesthetic properties. However, since the ceramic material is a polycrystalline material composed of ionic bonds and covalent bond grains, its ability to resist crack twinning and development is small, and it lacks the ability of plastic deformation like metal materials, which determines its fatal disadvantage is high brittleness, so it is greatly restricted in application. Only by improving the fracture toughness of ceramics, realizing the strengthening ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02C03B32/02
Inventor 高婧刘梦蝶王富袁坤陈吉华
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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