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Ceramic and its making method

A manufacturing method and ceramic technology, applied in the field of ceramics and their manufacturing, can solve the problems of damage to mechanical strength and particle characteristics and disadvantages of inorganic functional materials

Inactive Publication Date: 2003-01-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, in the ceramic obtained according to the prior art, the reactive gas which reacts with the metal particles must be supplied from the outside to the inside of the molded product through the pores in the molded product. As a result, in order to generate a large amount of Porosity, which damages the mechanical strength and characteristics of particles of inorganic functional materials, is a problem unique to the reaction sintering method
[0011] In addition, there is such a problem that since the firing is carried out in a nitrogen atmosphere, the control of the nitrogen concentration and the increase of the firing temperature are disadvantageous from the viewpoint of reducing the manufacturing cost.
However, at this time, this method is disadvantageous in terms of cost

Method used

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  • Ceramic and its making method

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Experimental program
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Embodiment 1

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. figure 1 Shown is an enlarged view of the internal structure of a flat-plate ceramic as an example of the present invention. The ceramic is composed of inorganic functional material particles 1 and composite oxide particles 2 located between the innumerable inorganic functional material particles 1 . like figure 2 As shown in the figure, when the inorganic functional material powder 1a is mixed with a mixture 2a of inorganic compound fine particles containing at least one metal fine particle, it is fired, as in figure 1 As shown, complex oxide particles 2 are formed between inorganic functional material particles 1 . In the figure, 3 denotes a pore.

[0025] Moreover, the manufacturing method of the ceramics of this invention has the following three processes.

[0026] To form complex oxide 2, such as figure 2 As shown in the figure, a mixture 2a of at...

Embodiment 2

[0049] Hereinafter, a second embodiment of the present invention will be described. The composition of the ceramic used in Example 2 and its manufacturing method is substantially the same as that of Example 1 and is omitted here.

[0050] to form MgAl 2 O 4 It is a spinel composite oxide in which Al particles and MgO particles are mixed in a weight ratio of 57.3:42.7, and the mixed powder is used as a mixture of inorganic compound fine particles. This mixture of inorganic compound fine particles was mixed with 30 parts by weight of alumina powder (100 parts by weight) and fired at 1600°C to obtain a ceramic (Sample 21). The properties including thermal conductivity of this sample are shown in Table 3.

[0051] Dimensional change rate (%)

Porosity (%)

Thermal conductivity (W / m·k)

Sample 21

0.0

9

18

Comparative Sample 1

0.0

16

10

[0052] Here, Comparative Sample 1 is a ceramic in which only Al particles a...

Embodiment 3

[0055] Hereinafter, a third embodiment of the present invention will be described. The composition of the ceramic used in Example 3 and its manufacturing method is substantially the same as that of Example 1, and is omitted here.

[0056] to form Si 2 Al 6 O 13 It is a mullite (mullite) composite oxide. Al particles and Si particles are mixed in a weight ratio of 74.2:25.8, and the powder obtained after mixing is used as a mixture of inorganic compound particles. This mixture of inorganic compound fine particles was mixed with 30 parts by weight of alumina powder (per 100 parts by weight), and fired at 1600°C to obtain a ceramic (sample 22). Its properties including permittivity and thermal conductivity and thermal conductivity are shown in Table 4.

[0057] Dimensional change rate

(%)

Porosity (%)

Dielectric coefficient

Thermal Conductivity

(W / m·K)

Sample 22

-0.1

8

7.5

15

Comparative Sample 1

0.0 ...

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Abstract

This invention relates to a ceramics and its manufacturing method, and this is to offer a ceramics showing very little dimensional change after sintering and high dimensional accuracies, so that the characteristics of inorganic functional material can be fully maintained and utilized. The ceramics comprises: (a) alumia particles, and (b) MgAl2O4 particles diffused in alumia particles formed by oxidation reaction of baking mixture of Al, MgO and at least one slected from GeO2, Ge2O3, Y2O3 and Ag2O; wherein, the MgAl2O4 particles swelled when baking, and MgAl2O4 particles filled in gaps of alumia particles.

Description

[0001] This application is a divisional application for the case of application number "95100625.8" and the name of the invention "ceramic and its manufacturing method". technical field [0002] The present invention relates to ceramics used in various electronic components and methods for their manufacture. Background technique [0003] Conventionally, ceramics have been produced as follows. First, the raw material powder of ceramics is molded without bonding with an organic binder, and then the molded product is fired to obtain ceramics. [0004] However, in the ceramics produced as described above, the moldings are always shrunk to some extent during the above-mentioned firing process, and it is difficult to obtain ceramics having a highly precise shape and size. [0005] Therefore, after the above-mentioned firing, in order to make the above-mentioned ceramics have the desired shape and size, it is necessary to carry out processing such as cutting or grinding and proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/111C04B35/117C04B35/18C04B35/65C04B35/74
CPCC04B35/18C04B35/65C04B35/117C04B2235/402
Inventor 犬塚敦原田真二东条正富冈聪志
Owner PANASONIC CORP
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