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Processable aluminium oxide base composite ceramic material and preparation method thereof

A composite ceramic and alumina-based technology, which is applied in the field of machinable alumina-based composite ceramic materials and its preparation, can solve the problems of unexplained fracture toughness, difficult to meet clinical needs, and high hardness, so as to improve machinability and meet clinical requirements. Application needs, overcome the effect of greater hardness

Inactive Publication Date: 2011-02-02
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent No. 200810015104.1 reports that "an alumina-based bioactive ceramic composite material" has good bioactivity, but its hardness is high and it is difficult to achieve machinability, and the hardness value is higher than that of human teeth. Hard, not suitable for use in dental restorations
The Chinese patent No. 200410079278.9 reports "a kind of machinable living active ceramics and its preparation method", but the bending strength of the material is only 134MPa, and the fracture toughness is not explained, so it is difficult to meet the clinical needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] ① Mix CaO powder and SiO with a mass ratio of 1:1 2 Mix powders, use absolute ethanol as the medium, and use alumina balls to mill in a planetary ball mill for 1 hour, then vacuum-dry and grind to obtain sintering aids; the addition of sintering aids is mainly to form a liquid phase and increase the mass transfer process , reduce the sintering temperature and increase the density of ceramics.

[0017] ② Weigh raw materials according to the following quality: Al 2 o 3 Powder 88g, MgO powder 5g, TiO 2 Powder 5g, described sintering aid 2g.

[0018] ③The MgO powder and TiO powder weighed in step ② 2 Powders were mixed, and ball milled for 2 hours in a planetary ball mill with absolute ethanol as the medium;

[0019] ④Weigh the sintering aid and Al in step ② 2 o 3 powder is added to the MgO powder and TiO powder obtained in step ③ 2 powder, using absolute ethanol as the medium for ball milling for 3 hours, then drying the ball mill slurry in a vacuum desiccator, gri...

Embodiment 2

[0022] Al in this example 2 o 3 Powder 75g, MgO powder 10g; TiO 2 powder 10g; sintering aid 5g.

[0023] ① Mix CaO powder and SiO with a mass ratio of 1:1 2 Powders were mixed, with absolute ethanol as the medium, and alumina balls were used to mill in a planetary ball mill for 1 hour, then vacuum-dried and ground to obtain a sintering aid;

[0024] ② Weigh raw materials according to the following quality: Al 2 o 3 Powder 75g, MgO powder 10g, TiO 2 powder 10g, the sintering aid 5g;

[0025] ③The MgO powder and TiO powder weighed in step ② 2 Powders were mixed, and ball milled for 2 hours in a planetary ball mill with absolute ethanol as the medium;

[0026] ④Weigh the sintering aid and Al in step ② 2 o 3 powder is added to the MgO powder and TiO powder obtained in step ③ 2 powder, using absolute ethanol as the medium for ball milling for 3 hours, then drying the ball mill slurry in a vacuum desiccator, grinding, and passing through a 400-mesh sieve to obtain a mixed...

Embodiment 3

[0029] Different from Example 1, in this example Al 2 o 3 Powder 60g, MgO powder 15g; TiO 2 powder 15g; sintering aid 10g.

[0030] Vacuum hot pressing sintering conditions: maximum temperature 1400°C, pressurization 40MPa, sintering for 30min to obtain a billet with a relative density of 99.6%, a Vickers hardness of 8.12GPa, and a fracture toughness of 3.52MPa m 1 / 2 , the bending strength is 255MPa, and the machinability coefficient is 0.433.

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Abstract

The invention discloses a processable aluminium oxide base composite ceramic material, which comprises the following raw materials in parts by mass: 60-88 parts of Al203, 5-15 parts of MgO, 5-15 parts of TiO2, 1-5 parts of SiO2 and 1-5 parts of CaO. The preparation method thereof comprises the following steps: mixing Cao powder and SiO powder in a proportion of 1:1 to prepare a sintering assistant; premixing MgO powder and TiO2 powder, then mixing with Al203 powder and the sintering assistant, ball-milling, drying the powder by ball-milling, and hot pressed sintering and molding at vacuum atmosphere. The invention overcomes the shortages that the aluminium oxide ceramic has higher hardness, and is difficult to process, produces a compound ceramic material with certain processability, and is especially applicable to a full ceramic reparation material in dentistry.

Description

technical field [0001] The invention relates to the field of functional ceramic materials, in particular to a machinable alumina-based composite ceramic material for dental restoration and a preparation method thereof. Background technique [0002] Alumina ceramic material has become a good dental restoration material because of its high hardness, wear resistance, high temperature resistance, good chemical stability, electrical insulation and biocompatibility, and low price. But it also has the disadvantage of poor toughness inherent in ceramic materials, and its fracture toughness is only 3MPa m 1 / 2 about. On the other hand, the chemical bonding of the ceramic itself determines its high hardness and relatively high brittleness at room temperature. This brittle-hard characteristic brings the problems of difficult processing and large processing damage of ceramics. [0003] The Chinese Patent No. 200810015104.1 reports that "an alumina-based bioactive ceramic composite mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/10
Inventor 张光磊胡前库秦国强李彦芳付华邵长涛
Owner SHIJIAZHUANG TIEDAO UNIV
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