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Dental restoration ceramic material and preparation method thereof

A ceramic material and oral restoration technology, which is applied in the field of medical materials, can solve the problems of demanding process conditions and increasing the difficulty of industrial production

Active Publication Date: 2022-02-15
XIANGYA HOSPITAL CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires accurate weighing of each raw material and has strict requirements on process conditions, which undoubtedly increases the difficulty of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Will Si 3 N 4 、Al 2 o 3 and MgO are weighed according to the ratio, and the masses of the three substances are 89.2g, 5.1g and 3.6g respectively;

[0022] B. Put the raw material powder into a polyurethane ball mill tank, use absolute ethanol as a dispersion medium, and boron nitride as a ball mill ball, and use a planetary ball mill to mill the mixed raw materials at a speed of 350rad / s for 6 hours;

[0023] C. Place the mixed slurry after ball milling in a drying oven and dry it at 120°C for 20 hours;

[0024] D. Pass the dried mixed powder through an 80 mesh sieve, then weigh 40g of the mixed powder and place it in a mold for compression molding, wherein the pressure is 32MPa, then carry out isostatic pressing, the pressure is 105MPa, and the holding time is 8s;

[0025] E. Put the pressed and formed product into an atmosphere pressure sintering furnace, and sinter in a nitrogen atmosphere, wherein the sintering pressure is 4.5MPa, the sintering temperature is...

Embodiment 2

[0028] A. Will Si 3 N 4 、Al 2 o 3 and MgO are weighed according to the ratio, and the masses of the three substances are 89.2g, 5.1g and 3.6g respectively;

[0029] B. Put the raw material powder into a polyurethane ball mill tank, use absolute ethanol as a dispersion medium, and boron nitride as a ball mill ball, and use a planetary ball mill to mill the mixed raw materials at a speed of 350rad / s for 6 hours;

[0030] C. Place the mixed slurry after ball milling in a drying oven and dry it at 120°C for 20 hours;

[0031] D. Pass the dried mixed powder through an 80 mesh sieve, then weigh 40g of the mixed powder and place it in a mold for compression molding, wherein the pressure is 32MPa, then carry out isostatic pressing, the pressure is 105MPa, and the holding time is 8s;

[0032] E. Put the pressed and formed product into an atmosphere pressure sintering furnace, and sinter in a nitrogen atmosphere, wherein the sintering pressure is 4.5MPa, the sintering temperature is...

Embodiment 3

[0035] A. Will Si 3 N 4 、Al 2 o 3 and MgO are weighed according to the ratio, and the masses of the three substances are 89.2g, 5.1g and 3.6g respectively;

[0036] B. Put the raw material powder into a polyurethane ball mill tank, use absolute ethanol as a dispersion medium, and boron nitride as a ball mill ball, and use a planetary ball mill to mill the mixed raw materials at a speed of 350rad / s for 6 hours;

[0037] C. Place the mixed slurry after ball milling in a drying oven and dry it at 120°C for 20 hours;

[0038] D. Pass the dried mixed powder through an 80 mesh sieve, then weigh 40g of the mixed powder and place it in a mold for compression molding, wherein the pressure is 32MPa, then carry out isostatic pressing, the pressure is 105MPa, and the holding time is 8s;

[0039] E. Put the pressed and formed product into an atmosphere pressure sintering furnace, and sinter in a nitrogen atmosphere, wherein the sintering pressure is 4.5MPa, the sintering temperature is...

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Abstract

The invention relates to a dental restoration ceramic material and a preparation method thereof. Subzero treatment is a new technology developed on the basis of a common cold treatment process, but most research objects of subzero treatment at the present stage stay on steel materials. In order to prolong the service life of a traditional silicon nitride ceramic material as a dental restoration material, sintered silicon nitride ceramic is put into liquid nitrogen at the temperature of -196 DEG C for subzero treatment for the first time. Experiments show that the fracture toughness of the silicon nitride ceramic material can be remarkably improved through 20-60 min of subzero treatment, and the maximum fracture toughness can be improved to 8.91 MPa.m < 1 / 2 >. Through the treatment, the preparation difficulty of the silicon nitride ceramic is reduced, and meanwhile, the application scene of the silicon nitride ceramic serving as a medical material is widened.

Description

technical field [0001] The invention relates to the field of medical materials, in particular to a ceramic material for dental restoration and a preparation method thereof. Background technique [0002] Silicon nitride (Si 3 N 4 ) Ceramics have high room temperature strength and fracture toughness. The room temperature flexural strength of hot-pressed sintered dense silicon nitride is usually 800-1050MPa, and the fracture toughness is 6-7MPa m1 / 2. Nitriding of pressureless sintering and gas pressure sintering The mechanical properties of silicon ceramics are slightly lower. At the same time, silicon nitride ceramics have high hardness, HV is about 18-21GPa, HRA is about 91-93, and the friction coefficient is about 0.02-0.35. Because silicon nitride ceramics have excellent mechanical properties, thermal properties, chemical stability and dielectric properties, they are widely used in many aspects such as electronics, electricity and biomedicine. [0003] However, the insu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/645A61K6/802A61K6/807
CPCC04B35/584C04B35/622C04B35/645A61K6/802A61K6/807C04B2235/6567C04B2235/96Y02P40/60
Inventor 孙婧朱帅张采琪
Owner XIANGYA HOSPITAL CENT SOUTH UNIV
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