Ceramic and its making method

A manufacturing method and technology of ceramics, applied in the field of ceramics and its 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

AI Technical Summary

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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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings. figure 1 Shown is an enlarged view of the internal structure of a flat ceramic as an example of the present invention. This ceramic is composed of inorganic functional material particles 1 and composite oxide particles 2 located between the innumerable inorganic functional material particles 1 . Such as figure 2 As shown, when the mixture 2a of inorganic compound particles containing at least one or more metal particles is mixed with the inorganic functional material powder 1a, it is fired, as figure 1 As shown, composite oxide particles 2 are formed between inorganic functional material particles 1 . In the figure, 3 represents a stomata.

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

[0026] For the formation of complex oxides 2, such as figure 2 As shown, a mixture 2a of at least two or more metal pa...

Embodiment 2

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

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

[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 using only Al particles as ...

Embodiment 3

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

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

[0057] Dimensional change rate

(%)

Porosity (%)

Permittivity

Thermal Conductivity

(W / m·K)

Sample 22

-0.1

8

7.5

15

Comparative sample 1

0.0

16

9.8

10

...

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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) Si2Al6O13 particles diffused in alumia particles formed by oxidation reaction of baking mixture of Al, Si and Ta2O5; wherein, the Si2Al6O13 particles swelled when baking, and Si2Al6O13 particles filled in gaps of alumia particles.

Description

[0001] This application is a divisional application made on the application number "95100625.8" and the title of the invention is "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 manufactured as follows. First, raw material powder of ceramics is bonded and molded with an organic binder, and then the molded product is fired to obtain ceramics. [0004] However, with the ceramics produced as above, the molded product always shrinks to some extent during the above-mentioned firing process thereof, and it is difficult to obtain ceramics with high precision in shape and size. [0005] Therefore, after the above-mentioned firing, in order to make the above-mentioned ceramics have a desired shape and size, it is necessary to process and process the ceramics such as cutting or grinding. ...

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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