Preparation method of glass fiber reinforced quartz ceramic

Abstract

The invention discloses a preparation method of a glass fiber reinforced quartz ceramic. According to the preparation method, quartz powder with different particle diameters is uniformly mixed with glass fibers according to different proportions at first so as to obtain A; an appropriate amount of polyvinyl alcohol and water are added to A for granulation; glass fibers or woven fiber cloth is placed in a cavity of a molding die, and the gap is filled by the powder after the granulation; after completion, mixing and pressing are carried out to prepare a quartz ceramic body; and the quartz ceramic body is dried and then sintered at a high temperature to prepare the glass fiber reinforced quartz ceramic. The prepared glass fiber reinforced quartz ceramic has a relatively low dielectric constant and can be adjusted in a small range; and silicon sol is solidified by sintering after immersion, so that the strength of the glass fiber reinforced quartz ceramic is ensured.

Description

technical field

[0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of glass fiber reinforced quartz ceramics. Background technique

[0002] Quartz ceramics is a new type of high-purity, high-temperature-resistant quartz material. It is a sintered body made of fused silica or quartz glass through crushing, molding, sintering and other processes. It not only retains many advantages of quartz glass, but also Some production processes of ceramics can be used. Quartz ceramics have a series of excellent properties such as high strength, good thermal stability, small thermal expansion coefficient, low dielectric constant, good acid and alkali corrosion resistance, good electrical insulation, and low cost. In the iron and steel metallurgy industry, it is used as a quartz ceramic hearth roller, which effectively solves the problems of oxidation and nodulation. In the production process of float gl...

Examples

preparation example Construction

[0026] A preparation method of glass fiber reinforced quartz ceramics of the present invention, first uniformly mix quartz powders of different particle sizes in different proportions to obtain A, add appropriate amount of polyvinyl alcohol and water to A for granulation, and weave glass fibers or The fiber cloth is placed in the cavity of the forming mold, and the gap is filled with the granulated powder. After completion, the glass fiber reinforced quartz ceramic body is mixed and pressed, and the quartz ceramic body is put into a drying oven for drying. After drying, Put it into a high-temperature sintering furnace to control a certain temperature to complete sintering to make a glass fiber reinforced quartz ceramic semi-finished product, then impregnate the ceramic semi-finished product in silica sol, and then put it into a medium temperature furnace to control a certain temperature to complete curing to form a glass fiber reinforced quartz ceramic.

[0027] Quartz powder w...

Embodiment 1

[0036] S1. Weigh 100g of 2um quartz powder and 30g of 20um quartz powder, put them into the mixer and mix them uniformly for 20min to complete the mixing.

[0037] S2. After adding 20 g of polyvinyl alcohol and 5 g of distilled water into the mixer, continue mixing for 30 min to complete granulation.

[0038] S3. Weigh 150g of glass fiber woven fiber cloth with a diameter of 10 and a length of 55um, place it in the cavity of the forming mold, spread the granulated quartz powder evenly in the dry pressing mold, fill the gaps, and place it under a pressure of 10MPa The glass fiber-reinforced quartz ceramic green body is obtained by pressing down.

[0039] S4. The ceramic body is placed in a drying oven, and the temperature is controlled at 100° C. for 10 hours.

[0040] S5. Put the dried ceramic body into a high-temperature sintering furnace and embed it in 1um graphite powder, close the furnace door, adjust the heating rate of 3°C / min to 1100°C, keep it warm for 1h after reach...

Embodiment 2

[0044]S1. Weigh 130g of 6um quartz powder and 35g of 25um quartz powder, put them into the mixer and mix them uniformly for 25min to complete the mixing.

[0045] S2. After adding 25g of polyvinyl alcohol and 10g of distilled water into the mixer, continue mixing for 35 minutes to complete granulation.

[0046] S3. Weigh 170g of glass fiber woven fiber cloth with a diameter of 10 and a length of 60um, place it in the cavity of the forming mold, fill the gaps, spread the granulated quartz powder evenly in the dry pressing mold, and press it under a pressure of 25MPa The glass fiber-reinforced quartz ceramic green body is obtained by pressing down.

[0047] S4. The ceramic body is placed in a drying oven, and the temperature is controlled at 150° C. for 15 hours.

[0048] S5. Put the dried ceramic body into a high-temperature sintering furnace and embed it in 15um graphite powder, close the furnace door, adjust the heating rate of 5°C / min to 1200°C, and keep it warm for 1.5h af...

technical field

[0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a preparation method of glass fiber reinforced quartz ceramics. Background technique

[0002] Quartz ceramics is a new type of high-purity, high-temperature-resistant quartz material. It is a sintered body made of fused silica or quartz glass through crushing, molding, sintering and other processes. It not only retains many advantages of quartz glass, but also Some production processes of ceramics can be used. Quartz ceramics have a series of excellent properties such as high strength, good thermal stability, small thermal expansion coefficient, low dielectric constant, good acid and alkali corrosion resistance, good electrical insulation, and low cost. In the iron and steel metallurgy industry, it is used as a quartz ceramic hearth roller, which effectively solves the problems of oxidation and nodulation. In the production process of float gl...

Examples

preparation example Construction

[0026] A preparation method of glass fiber reinforced quartz ceramics of the present invention, first uniformly mix quartz powders of different particle sizes in different proportions to obtain A, add appropriate amount of polyvinyl alcohol and water to A for granulation, and weave glass fibers or The fiber cloth is placed in the cavity of the forming mold, and the gap is filled with the granulated powder. After completion, the glass fiber reinforced quartz ceramic body is mixed and pressed, and the quartz ceramic body is put into a drying oven for drying. After drying, Put it into a high-temperature sintering furnace to control a certain temperature to complete sintering to make a glass fiber reinforced quartz ceramic semi-finished product, then impregnate the ceramic semi-finished product in silica sol, and then put it into a medium temperature furnace to control a certain temperature to complete curing to form a glass fiber reinforced quartz ceramic.

[0027] Quartz powder w...

Embodiment 1

[0036] S1. Weigh 100g of 2um quartz powder and 30g of 20um quartz powder, put them into the mixer and mix them uniformly for 20min to complete the mixing.

[0037] S2. After adding 20 g of polyvinyl alcohol and 5 g of distilled water into the mixer, continue mixing for 30 min to complete granulation.

[0038] S3. Weigh 150g of glass fiber woven fiber cloth with a diameter of 10 and a length of 55um, place it in the cavity of the forming mold, spread the granulated quartz powder evenly in the dry pressing mold, fill the gaps, and place it under a pressure of 10MPa The glass fiber-reinforced quartz ceramic green body is obtained by pressing down.

[0039] S4. The ceramic body is placed in a drying oven, and the temperature is controlled at 100° C. for 10 hours.

[0040] S5. Put the dried ceramic body into a high-temperature sintering furnace and embed it in 1um graphite powder, close the furnace door, adjust the heating rate of 3°C / min to 1100°C, keep it warm for 1h after reach...

Embodiment 2

[0044]S1. Weigh 130g of 6um quartz powder and 35g of 25um quartz powder, put them into the mixer and mix them uniformly for 25min to complete the mixing.

[0045] S2. After adding 25g of polyvinyl alcohol and 10g of distilled water into the mixer, continue mixing for 35 minutes to complete granulation.

[0046] S3. Weigh 170g of glass fiber woven fiber cloth with a diameter of 10 and a length of 60um, place it in the cavity of the forming mold, fill the gaps, spread the granulated quartz powder evenly in the dry pressing mold, and press it under a pressure of 25MPa The glass fiber-reinforced quartz ceramic green body is obtained by pressing down.

[0047] S4. The ceramic body is placed in a drying oven, and the temperature is controlled at 150° C. for 15 hours.

[0048] S5. Put the dried ceramic body into a high-temperature sintering furnace and embed it in 15um graphite powder, close the furnace door, adjust the heating rate of 5°C / min to 1200°C, and keep it warm for 1.5h af...

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