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Preparation of zircite tube

A technology of zirconia and ceramic powder, which is applied in the field of zirconia tube preparation, can solve the problems of low yield and poor compactness, and achieve the effect of high yield, high density and elimination of voids

Active Publication Date: 2012-04-18
浙江通源环保科技有限公司
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Problems solved by technology

[0006] In order to overcome the shortcomings of poor compactness and low yield of existing zirconia tube preparation methods, the present invention provides a method for preparing zirconia tubes that can effectively improve the compactness of zirconia tubes and have high yield

Method used

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] A method for preparing a zirconia tube, the method comprising:

[0023] (1) Preparation of ceramic slurry: fully mix ceramic powder, microcrystalline paraffin, polyethylene or polypropylene, and oleic acid;

[0024] (2), injection molding: make suitable pellets required for injection molding by a granulator, and finally produce the blank of the oxygen sensor zirconium tube with the injection molding machine;

[0025] (3) Low-temperature wax discharge: carry out long-term low-temperature heating treatment to discharge paraffin resin binder;

[0026] (4) Cold isostatic pressing: make the green body be uniformly pressed in all directions, and eliminate the gaps left in the green body after wax removal;

[0027] (5) High temperature sintering: sintering into zirconia tubes.

[0028] In the step (4), latex rubber is used to evenly coat the inner and outer tube wal...

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Abstract

The invention relates to a preparation method for a zirconia tube. The method comprises the following steps: firstly, the preparation of ceramic slurry: ceramic powder, microcrystalline wax, polyethylene or polypropylene and oleic acid are fully mixed; secondly, injection molding: suitable particles required for injection molding are produced through a granulating machine, and finally the blank of the zirconium tube of an oxygen sensor is produced; thirdly, low-temperature dewaxing: low-temperature heating treatment is performed for a long term, in order to discharge the paraffine resin adhesive; fourthly, isostatic cool pressing: the stress to the blank is uniform in all directions, in order to eliminate the gap reserved in the blank after dewaxing; fifthly, high temperature sintering: the zirconia tube is sintered. The invention provides a preparation method which can effectively enhance the compactness of the zirconia tube with high rate of finished products.

Description

technical field [0001] The invention relates to a method for preparing an accessory of an oxygen sensor, especially a method for preparing a zirconia tube Background technique [0002] The core part of the oxygen sensor is a doped zirconia (Y 2 o 3 -ZrO 2 or CaO-ZrO 2 solid solution material), the inner and outer surfaces are coated with a thin layer of porous platinum electrodes, the outer surface is exposed to the exhaust gas flow, the inner surface is connected to the atmosphere and connected to a wire leading to the exhaust gas control module connected. The element is actually a galvanic cell, with zirconia as the electrolyte and layers of platinum as the electrodes. Zirconia has such a characteristic at high temperature that an electromotive force is generated when the difference in oxygen concentration between the inside and outside is large. The oxygen concentration, that is, the oxygen partial pressure, is different between the atmospheric side and the vehicle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622
Inventor 柏威廉
Owner 浙江通源环保科技有限公司
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