Magnesium oxide (MgO)-silicon dioxide (SiO2)-aluminum oxide (Al2O3)-boron trioxide (B2O3)-potassium fluoride (KF) glass ceramic composite material adopting silicon carbide (SiC) as enhanced-phase and preparation method thereof

A technology of glass ceramics and composite materials, applied in the field of new glass ceramics, can solve the problem of low flexural strength and performance, and achieve the effect of low cost

Inactive Publication Date: 2014-04-02
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently MgO-SiO 2 –Al 2 o 3 –B 2 o 3 – KF glass-ceramic has a maximum flexural strength of only 80MPa, and the flexural strength performance is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] SiO 2 、Al 2 o 3 , MgO, B 2 o 3 Mix with KF powder in the proportion of 50.0, 15.9, 13.8, 6.8, 13.5wt%, respectively, and put it into the alumina porcelain boat. Then it is melted in a silicon-molybdenum rod resistance furnace at 1500°C for 1.5 hours, and immediately water-quenched. The water-quenched material is dried, put into an agate mortar for grinding, and then passed through a 300-mesh sieve. Then add 30%Wt of 2.1μm SiC powder and mix well. The mixture was pressed into a 40×5×5 (mm) strip billet with a pressing pressure of 1.5MPa. Then it was sintered at 1100°C and kept for 1.5 hours. Cool in the furnace. The above MgO-SiO 2 –Al 2 o 3 –B 2 o 3 –The flexural strength of KF glass-ceramic composite material is 280±20MPa.

Embodiment 2

[0015] SiO 2 、Al 2 o 3 , MgO, B 2 o 3 Mix with KF powder in the proportion of 40.0, 15.9, 13.8, 10.1, 20.2wt%, respectively, and put it into the alumina porcelain boat. Then it is melted in a silicon-molybdenum rod resistance furnace at 1500°C for 1.5 hours, and immediately water-quenched. The water-quenched material is dried, put into an agate mortar for grinding, and then passed through a 300-mesh sieve. Then add 10%Wt of 2.0μm SiC powder and mix well. The mixture was pressed into a 40×5×5 (mm) strip billet, and the pressing pressure was 2MPa. Then it was sintered at 1100°C and kept for 2.0 hours. Cool in the furnace. The above MgO-SiO 2 –Al 2 o 3 –B 2 o 3 –The flexural strength of KF glass-ceramic composite material is 290±20MPa.

Embodiment 3

[0017] A kind of MgO-SiO with SiC as reinforcement phase 2 –Al 2 o 3 –B 2 o 3 – KF glass-ceramic composite material, which consists of SiO 2 、Al 2 o 3 , MgO, B 2 o 3 , KF and SiC, the SiO 2 、Al 2 o 3 , MgO, B 2 o 3 The mass ratio to KF is 20:35:30:5:9, and the mass of SiC accounts for SiO 2 、Al 2 o 3 , MgO, B 2 o 3 and 5% of the total mass of KF.

[0018] MgO-SiO with SiC as reinforcement phase 2 –Al 2 o 3 –B 2 o 3 -The preparation method of KF glass-ceramic composite material, its step is as follows:

[0019] (1) SiO 2 、Al 2 o 3 , MgO, B 2 o 3 After mixing evenly with KF powder, heat and melt at 1400°C in a resistance furnace and quench in water to obtain glass frit;

[0020] (2) Grind the glass frit, pass through a 300-mesh sieve, then add SiC powder and mix evenly to obtain a mixture;

[0021] (3) The mixture is pressed into shape, then sintered at 800°C, and held at 800°C for 2 hours for crystallization. The above MgO-SiO 2 –Al 2 o 3 –B 2...

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Abstract

The invention discloses a magnesium oxide (MgO)-silicon dioxide (SiO2)-aluminum oxide (Al2O3)-boron trioxide (B2O3)-potassium fluoride (KF) glass ceramic composite material adopting silicon carbide (SiC) as an enhanced-phase, which is made of SiO2, Al2O3, MgO, B2O3, KF and SiC, the mass ratio of the SiO2, Al2O3, MgO, B2O3 and KF is 20 to 50: 12 to 35: 10 to 30: 5 to 9: 9 to 18, and the mass of the SiC accounts for 5 to 30 percent of the gross mass of the SiO2, Al2O3, MgO, B2O3 and KF. The preparation method of the composite material comprises the steps of: firstly water quenching the mixed powder of the SiO2, Al2O3, MgO, B2O3 and KF, adding SiC particles after being ground to be further uniformly mixed, completing the crystallization after the shaping, and acquiring the glass ceramic composite material. The tensile strength of the glass ceramic composite material acquired through the method can reach 200 to 400MPa. The composite material and the method are low in cost and applicable to the industrial scale.

Description

technical field [0001] The invention relates to a new type of glass ceramics with particle SiC as a reinforcing phase, and the technical field of improving the strength and toughness of the glass ceramics. Background technique [0002] Glass-ceramics, also known as glass-ceramic, refers to a new type of material that has both crystalline and amorphous material characteristics. It is usually obtained by heat-treating the growth of crystal nuclei in the base glass to form a uniform distribution of tiny crystals. [0003] Traditional metal materials are difficult to meet the increasingly high requirements for the use of materials in the development of high-tech fields such as aerospace, aviation, energy, and military affairs, while ceramic materials provide the possibility of using at higher temperatures without cooling or less cooling. However, compared with traditional metal materials, the inherent brittleness of ceramic materials and the resulting low reliability in use sev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C10/00C03B32/02
Inventor 张小立汤锋刘芳范积伟穆云超赵慧君张振国
Owner ZHONGYUAN ENGINEERING COLLEGE
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