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Method for preparing semiconducting ceramics, made of metal oxides, used particularly for varistors.

A technology of oxides and semiconductors, applied in the direction of oxide conductors, non-metallic conductors, varistor cores, etc., to achieve good electrical performance

Inactive Publication Date: 2010-12-08
AREVA T&D
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0058] Furthermore, the object of the present invention is to provide a method for the preparation of ceramics based on metal oxides, which does not have the disadvantages, limitations and disadvantages of the existing methods, especially the "PADO" method, and solves the problems existing in the existing methods

Method used

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  • Method for preparing semiconducting ceramics, made of metal oxides, used particularly for varistors.
  • Method for preparing semiconducting ceramics, made of metal oxides, used particularly for varistors.

Examples

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Embodiment 1

[0274] This example illustrates a first example according to the invention in which the "PADO" method is employed in order to produce tin oxide doped with oxides of metals in specific proportions.

[0275] In this example, ceramics having the following composition (% by weight) were prepared:

[0276] -SnO 2 : 98.24%;

[0277] -Co 3 o 4 : 0.05%;

[0278] -MnO 2 : 1.69%;

[0279] -Nb 2 o 5 : 0.01%;

[0280] - Ta 2 o 5 : 0.01%.

[0281] The "PADO" method uses five starting materials: tin and cobalt, manganese, niobium and tantalum as dopants.

[0282] Liquid alloys were first prepared from these five materials. This is followed by quenching in order to fix the composition of the resulting alloy.

[0283] The alloy was then placed in a nebulizer where it was sparged by a stream of nitrogen gas to obtain alloy powder.

[0284] The alloy was prepared and sprayed according to a laboratory model.

[0285] Thus, the alloy was prepared in a vacuum-...

Embodiment 2

[0293] This example illustrates a second embodiment according to the invention, wherein the "PADO" method is modified by carrying out partial (no longer total) tin oxide powder (instead of alloy powder), wherein in the case of this partially oxidized powder , doping oxides are added to the oxidized powder before sintering.

[0294] In this example, a ceramic having a composition similar to Example 1 was prepared. :

[0295] -SnO 2 : 98.3%;

[0296] -Co 3 o 4 : 0.05%;

[0297] -MnO 2 : 1.69%;

[0298] -Nb 2 o 5 : 0.01%;

[0299] - Ta 2 o 5 : 0.03%.

[0300] The "PADO" method is carried out with pure bulk tin as the starting material. The latter is first sprayed in nitrogen to obtain a metal powder. Main parameters related to spray gas: pressure 3 bar, flow rate 45 L / min, temperature 700 °C. use figure 1 spray device shown.

[0301] The powder is sieved so that only fractions with a particle size of less than 40 μm remain. The powder is t...

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Abstract

The invention discloses a method for preparation of semiconductor ceramic which is based on impure tin oxide, this method is using PADO (prosoma alloy direct oxidation) way in the alloy of tin and adulterate metal, or using the PADO method in tin and the adulterate metal is added in sintered powder in the form of oxide.

Description

technical field [0001] The present invention relates to a method for the preparation of semiconducting ceramics comprising metal oxides, more particularly to comprising one or more base metal oxides such as tin oxide SnO 2 And a method for preparing one or more semiconductor ceramics doped with metal oxides. Background technique [0002] Such semiconducting ceramics, whether in bulk or in thin layer form, are used for the production of non-linear resistance as a function of voltage and in particular for the production of varistors, which are used, for example, in low, medium and high voltage arresters or in connection with, for example, electrical or Voltage limiting components related to electronic devices. [0003] The technical field of the invention can thus be classified in general with metal oxide-based ceramics and their preparation, and more specifically with ceramics exhibiting a resistance that is non-linear as a function of voltage, such as varistors. [0004] S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/108H01C8/04H01B1/08C01G1/02C04B35/01C04B35/622
CPCC04B35/457C04B35/628C04B2235/3241C04B2235/3277H01C17/06533C04B35/62805C04B2235/77C04B35/653C04B2235/3251C04B2235/405C04B2235/404C04B35/6265C04B2235/40H01C7/108C04B35/6268C01B13/322C04B2235/5436C04B2235/96C04B35/62665C04B2235/3267
Inventor 迈赫达德·哈桑扎德塞利娜·马查多-巴伊雷诺·梅斯拉蒙·普亚内
Owner AREVA T&D
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