Aluminum oxide ceramic slender tube and manufacture method thereof

A technology of alumina ceramics and a production method, which is applied in the field of ceramic pipe fittings for high-voltage electrical appliances, and achieves the effect of broadening the application field and solving the problem of easy deformation during sintering.

Inactive Publication Date: 2011-01-12
河南车材企业孵化器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an alumina ceramic slender tube and its manufacturing method, which effectively solves the problems of molding and turning of such products, and at the same time controls the problem of sintering deformation of such products

Method used

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  • Aluminum oxide ceramic slender tube and manufacture method thereof
  • Aluminum oxide ceramic slender tube and manufacture method thereof
  • Aluminum oxide ceramic slender tube and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A kind of aluminum oxide ceramic slender tube, is made up of the raw material of following percentage by weight: α-Al 2 o 3 Powder 90%, SiO 2 1%, cooked talc 1%, CaCO 3 4%, Suzhou soil 4%, the total weight of the above raw materials is 100%, plus 0.05% polyvinyl alcohol solution accounting for the total weight of the above raw materials, 0.1% dispersant sodium hexametaphosphate, 80% water, polyvinyl alcohol solution The mass concentration is 6%.

[0028] Particle size requirements of each raw material: α-Al 2 o 3 Powder 5000-6000 mesh, SiO 2 300-325 mesh, cooked talc 300-400 mesh, CaCO 3 300-325 mesh, Suzhou soil 240-250 mesh.

[0029] A method for making an alumina ceramic slender tube, comprising the following steps:

[0030] (1) Ball milling and granulation

[0031] Add 50% α-Al to the ball mill 2 o 3 powder, add SiO 2 , cooked talc, CaCO 3 , Suzhou soil, and then add the remaining α-Al 2 o 3 Powder, water and dispersant, start ball mi...

Embodiment 2

[0047] Embodiment 2: the same place as embodiment 1 is no longer repeated, and the difference is:

[0048] Alumina ceramic slender tube raw material composition: α-Al 2 o 3 Powder 96%, SiO 2 0.5%, cooked talc 0.5%, CaCO 3 2%, Suzhou soil 1%, plus 0.1% polyvinyl alcohol solution, 0.3% sodium hexametaphosphate, and 85% water accounting for the total weight of the above-mentioned raw materials. The concentration of the polyvinyl alcohol solution is 5%.

[0049] Production method: (1) The particle size of the granulated powder obtained by ball milling and granulation is 40-80 mesh;

[0050] (2) Isostatic pressing When isostatic pressing, the core quenching temperature is 835°C;

[0051] (3) Turning the green body and clamping the blank for turning, the speed of the lathe is 380r / min;

[0052] (4) When the fired blank is hanging and fired, the firing temperature is 1680°C and the heat preservation is 3h.

Embodiment 3

[0053] Embodiment 3: The same part as Embodiment 1 is no longer repeated, and the difference is:

[0054] Alumina ceramic slender tube raw material composition: α-Al 2 o 3 Powder 91%, SiO 2 0.8%, cooked talc 0.2%, CaCO 3 3%, 5% of Suzhou soil, plus 0.06% polyvinyl alcohol solution, 0.5% sodium hexametaphosphate, and 83% water accounting for the total weight of the above raw materials. The concentration of the polyvinyl alcohol solution is 8%.

[0055] Production method: (1) The particle size of the granulated powder obtained by ball milling and granulation is 80-120 mesh;

[0056] (2) Isostatic pressing When isostatic pressing, the core quenching temperature is 825°C;

[0057] (3) Turning the green body and clamping the blank for turning, the speed of the lathe is 420r / min;

[0058] (4) When the fired blank is hanging and fired, the firing temperature is 1680°C and the heat preservation is 3.5h.

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Abstract

The invention relates to an aluminum oxide ceramic slender tube for a high-voltage fuse and a manufacture method thereof. The raw materials comprise 90 to 96% of alpha-Al2O3 powder, 0.2 to 1% of SiO2, 0.2 to 1% of calcined talcum, 1 to 5% of CaCO3, 1 to 5% of Su Zhou clay, and also comprise 0.04 to 0.1% of polyvinyl alcohol, 0.1 to 0.5% of dispersant and 80 to 85% of water. The manufacture method comprises the steps of: ball-milling and prilling; isostatic-pressing at the pressure of 120 MPa; drying; lathing with vacuum rubber expansion fixture; and setting and firing at the temperature of 1680 DEG C with the hanging method. The aluminum oxide ceramic slender tube of the invention has the diameter phi of 25 to 40 mm, the wall thickness of 2.5 to 3.5 mm, the length of more than 600 mm, and the straightness of less than 0.3 mm, and the properties of the tube are better than those of the similar products. The technology of the invention uses the isostatic-pressing and the vacuum rubber expansion fixture, thereby achieving the purpose that the small-bore thin walled tube can be molded and lathed, and solving the problem of easy deformation during the firing of the products, and effectively controlling the product quality. The products can be widely used in the high-voltage fuses as well as in the fields of electronics, machinery, chemical industry, metallurgy, textile industry, electric power industry and the like.

Description

1. Technical field: [0001] The invention relates to a ceramic pipe fitting for a high-voltage electrical appliance, in particular to an alumina ceramic slender pipe for a high-voltage fuse and a manufacturing method thereof. 2. Background technology: [0002] With the continuous application of 95 porcelain in the chemical and electrical industries, the application of small-diameter thin-walled pipe fittings has become more and more extensive in recent years, especially in the high-voltage electrical industry. The length, wall thickness and straightness of small-diameter porcelain tubes are the main detection indicators. Since the firing temperature of 95 porcelain is 1650-1700°C, the deformation of the tube fittings cannot be effectively controlled under high temperature conditions, resulting in most products being bent and deformed, which cannot be achieved. Requirements. The isostatic pressing of thin-walled small-diameter tubes is very difficult. When the pressure is low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 全建军黄怀岐宋建生白周喜赵天亮
Owner 河南车材企业孵化器有限公司
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