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Electronic component burning jig

a technology of electronic components and burning jigs, which is applied in the direction of liquid surface applicators, coatings, etc., can solve the problems of affecting the sintered ability of alumina acting as the intermediate layer, affecting the character of electronic components to be calcined, and affecting the substrate, so as to improve the sintered ability and adhesion, prevent the generation of warp, and improve the effect of strength

Inactive Publication Date: 2005-11-17
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] A second subject of the present invention is, among the above problems of the prior art, to provide a jig for calcining an electronic component having the various excellent characteristics, especially, such as peel-off resistance and strength by changing the material of an intermediate layer.
[0103] In the jig for calcining the electronic component of the fourth invention, the impurity vapor in the substrate may be contaminated into the electronic component during the calcination to pollute the electronic component. However, as defined in claim 23, the coating of the side surface of the substrate in addition to the top and bottom surfaces can prevent the scattering of the impurities from the substrate and the resultant contamination of the impurities into the electronic component almost completely.

Problems solved by technology

When an electronic component work such as a dielectric is contacted and reacted with the calcination jig, a problem arises that the characteristics may be deteriorated due to the fusion or the composition fluctuation of the work.
When the jig is repeatedly used and the particles contained in the surface zirconia layer has a lower particle removal resistance or a lower abrasion resistance, the fine particles are mixed in electronic components to cause a severe problem.
The phase change from a monoclinic system to a tetragonal system takes place in the zirconia at around 1100° C. As a result, a problem arises that the change of the thermal expansion coefficient accompanied with the phase transformation due to the repeated heat cycles eliminates the coated layer of the zirconia to generate cracks so that electronic components to be calcined are likely to be influenced by the substrate.
However, in the jig for calcining the electronic component, the sintered ability of the alumina acting as the intermediate layer is inferior and the alumina has only insufficient adhesion between the zirconia surface layer and the substrate.
Accordingly, the jig has a defect that the peeling-off of the zirconia surface layer cannot be prevented against the thermal stress generated by the expansion and the contraction of the zirconia surface layer due to the heat cycles.
In these methods relatively inexpensive and suitable for industrial production, the anti-grain detaching property and the anti-abrasion property of the formed zirconia layer may be insufficient.
In the jig for calcining the electronic component having the three-layer structure having the zirconia on the top and bottom surfaces, the investigation with respect to the performance elevation is insufficient.
Although the warp can be prevented, the other performance such as peel-off resitance has not bee sufficiently elucidated.

Method used

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Examples

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Effect test

example 1

[0122] An alumina-mullite substrate having about 10% in weight of a silica component was used as a substrate. As a main component of a zirconia layer, 70% in weight of yttria-stabilized zirconia having an average particle size of 80 μm, 20% in weight of yttria-stabilized zirconia having an average particle size of 3 μm and 7% in weight of calcia-stabilized zirconia were used. A mixture was prepared by adding 3% in weight of aluminum oxide acting as metal oxide and having an average particle size of 1 μm to the above oxides.

[0123] As an impurity, 0.5% in weight of SnO2 with respect to the above powders was added. These were uniformly mixed with a ball mill, and then water and polyvinyl alcohol acting as a binder were added thereto for making slurry. The slurry was spray-coated on the surface of the above substrate. The thickness of the obtained zirconia layer was about 150 μm. After being dried at 100° C., the spray-coated substrate was held from 1400 to 1600° C. for two hours to ob...

example 2

[0126] A mixture was obtained in the same manner as that of Example 1 except that, as the main component of the zirconia layer, 90% in weight of yttria-stabilized zirconia having an average particle size of 70 μm and 5% in weight of calcia-stabilized zirconia having an average particle size of 3 μm were used, and, as the metal oxides, 2% in weight of lanthanum oxide and 3% in weight of barium oxide both having average particle sizes of 1 μm were added. These were uniformly mixed with a ball mill, and then water and polyvinyl alcohol acting as a binder were added thereto for making slurry. The slurry was spray-coated on the surface of the above substrate. After being dried at 100° C., the spray-coated substrate was held from 1400 to 1600° C. for two hours to obtain a jig for calcining an electronic component having the calcined zirconia layer. The peel-off resistance and the wear resistance of the zirconia layer of the obtained jig were investigated. The results are shown in Table 1....

example 3

[0127] A mixture was obtained in the same manner as that of Example 1 except that, as the main component of the zirconia layer, 70% in weight of yttria-stabilized zirconia having an average particle size of 100 μm and 26% in weight of yttria-stabilized zirconia having an average particle size of 1 μm were used, and, as the metal oxides, 1% in weight of calcium oxide and 3% in weight of titanium oxide both having average particle sizes of 1 μm were added. These were uniformly mixed with a ball mill, and then water and polyvinyl alcohol acting as a binder were added thereto for making slurry. The slurry was spray-coated on the surface of the above substrate. After being dried at 100° C., the spray-coated substrate was held from 1400 to 1600° C. for two hours to obtain a jig for calcining an electronic component having the calcined zirconia layer. The peel-off resistance and the wear resistance of the zirconia layer of the obtained jig were investigated. The results are shown in Table ...

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Abstract

An electronic component burning jig comprising a base (11) and a zirconia layer (12) with which the surface of the base is characterized in that the zirconia layer containing one or more metal oxides forming a liquid phase is fired and the liquid phase (15) is crystallized after the firing to improve the separation resistance and wear resistance. Even when the zirconia layer is formed by a low-cost method such as coating, the zirconia layer is not separated from the base and no particle comes off the zirconia layer.

Description

TECHNICAL FIELD [0001] The present invention relates to a jig for calcining an electronic component such as a setter, a shelf board and a saggar for calcining the electronic component such as a dielectric, a multi-layered capacitor, a ceramic capacitor, a piezoelectric element and a thermistor. BACKGROUND ART [0002] A jig for calcining an electronic component is required to be unreactive with ceramic electronic components to be calcined in addition to having heat resistance and mechanical strength. When an electronic component work such as a dielectric is contacted and reacted with the calcination jig, a problem arises that the characteristics may be deteriorated due to the fusion or the composition fluctuation of the work. [0003] The substrate for the jig for calcining the electronic component generally includes an alumina-based material, an alumina-mullite-based material, an alumina-zirconia-based material, an alumina-magnesia-based spinel material, an alumina-mullite-cordierite-b...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05C13/00B22F3/10C04B41/89C04B35/117C04B35/486C04B35/63C04B35/64C04B41/50C04B41/52C04B41/87
CPCC04B35/117C04B35/486C04B2235/96C04B2235/80C04B2235/5472C04B2235/5436C04B2235/5427C04B2235/3463C04B2235/3418C04B2235/3298C04B2235/3293C04B2235/3284C04B2235/3272C04B2235/3251C04B2235/3246C04B35/6303C04B41/009C04B41/5042C04B41/52C04B41/87C04B41/89C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3217C04B2235/3222C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3232C04B2235/3234C04B2235/3236C04B2235/3244C04B41/4543C04B41/4547C04B41/5027C04B41/5031C04B35/10C04B35/185
Inventor HOSHINO, KAZUTOMOKAJINO, HITOSHIIDUTSU, YASUHISAHORIUCHI, KOUSHI
Owner MITSUI MINING & SMELTING CO LTD