Ceramic powder, and method for production of ceramic powder

A technology of ceramic powder and manufacturing method, which is applied in the manufacture/assembly of piezoelectric/electrostrictive devices, chemical instruments and methods, niobium compounds, etc., can solve the problems of increased manufacturing cost, composition deviation, easy evaporation of alkali metals, etc. , to achieve the effects of easy preservation and management, improving synthesis, and reducing manufacturing costs

Inactive Publication Date: 2009-04-29
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the firing process is performed to mass-produce ceramic sintered bodies, explosion-proof facilities are also required, which raises the problem of increased manufacturing costs.
[0013] In addition, since the synthesis degree of niobic acid base is low as described above, unreacted alkali metals are easily evaporated during firing, and thus there is a possibility that the composition may deviate and the desired composition may not be obtained.

Method used

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  • Ceramic powder, and method for production of ceramic powder
  • Ceramic powder, and method for production of ceramic powder
  • Ceramic powder, and method for production of ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] As a ceramic raw material, K is prepared 2 CO 3 , Nb 2 O 5 , Yb 2 O 3 , Y 2 O 3 , In 2 O 3 , Nd 2 O 3 , Eu 2 O 3 , Gd 2 O 3 , Dy 2 O 3 , Sm 2 O 3 , Ho 2 O 3 , Er 2 O 3 , Tb 2 O 3 , Lu 2 O 3 , La 2 O 3 And Bi 2 O 3 .

[0088] Then, according to the general formula: KNbO 3 +xM1O 3 / 2 In, to achieve the composition shown in Table 3, these ceramic raw materials were weighed.

[0089] After that, these weighed objects were put into a ball mill together with ethanol and PSZ, and the ethanol was wet-mixed. After the obtained mixture was dried, it was fired at a temperature of 900° C. for 2 hours to prepare each sample (ceramic powder) with sample numbers 1 to 20.

[0090] Then, using an X-ray diffractometer and CuK α rays as the X-ray source, the X-ray diffraction spectrum of each sample was measured shortly after firing, and the maximum peak intensity I of the different phase was calculated. D With KNbO 3 The maximum peak intensity I KN The intensity ratio of X, evaluates the degr...

Embodiment 2

[0107] In addition to the ceramic material of [Example 1], Na is also prepared 2 CO 3 , Using the same method and procedure as [Example 1], the general formula {(K 1-α Na α )NbO 3 +x M1O 3 / 2 } (Wherein α is 0.5 or 0.9) represents each sample (ceramic powder) of sample numbers 21 to 42.

[0108] Then, for each of the samples of sample numbers 21 to 42, the strength ratio X, the pH immediately after firing and 1000 hours after firing were measured by the same method and procedure as in [Example 1].

[0109] Table 4 shows the composition and measurement results of each sample with sample numbers 21 to 42.

[0110] [Table 4]

[0111]

[0112] * Indicates outside the scope of the present invention

[0113] Sample Nos. 21 to 32 contain the specific element M1 within the scope of the present invention. Therefore, it is the same as the sample Nos. 1 to 12 in [Example 1]. Soon after or after 1000 hours of calcination, the result was 7, showing neutrality, indicating that it was not deliq...

Embodiment 3

[0122] As a ceramic raw material, K is prepared 2 CO 3 , Na 2 CO 3 , Nb 2 O 5 , Yb 2 O 3 , TiO 2 , ZrO 2 And SnO 2 .

[0123] Then, follow the general formula: ANbO 3 +0.02YbO 3 / 2 +0.04M2O 2 In, the ceramic raw materials were weighed to achieve the composition shown in Table 5.

[0124] Thereafter, each sample (ceramic powder) with sample numbers 51 to 56 was produced by the same method and procedure as in [Example 1].

[0125] Then, for each of the samples with sample numbers 51 to 56, the strength ratio X and the pH immediately after firing and 1000 hours after firing were measured by the same method and procedure as in [Example 1].

[0126] Table 5 shows the composition and measurement results of each sample with sample numbers 51-56.

[0127] [table 5]

[0128]

[0129] It can be clearly seen from Table 5 that even when tetravalent Ti, Zr, and Sn are added to the composition of sample number 1 or sample number 21 as element M2, the intensity ratio is 0%. Out of phase. In add...

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PUM

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Abstract

A ceramic powder contains a principal component that is a perovskite-type complex oxide represented by the formula ANbO 3 (A is at least one selected from alkali metal elements and contains 10 mole percent or more of K) and also contains 0.0001 mole or more of an element per mole of the principal component. The element is at least one selected from the group consisting of Yb, Y, In, Nd, Eu, Gd, Dy, Sm, Ho, Er, Tb, and Lu. The ceramic powder preferably further contains at least one selected from the group consisting of Ti, Zr, and Sn. This enables that a non-deliquescent alkali niobate-based ceramic powder is produced at a high yield.

Description

Technical field [0001] The present invention relates to ceramic powder and a method of manufacturing ceramic powder, and more specifically, to a ceramic powder containing a niobic acid compound as a main component and a method of manufacturing the same. Background technique [0002] As ceramic materials for electronic components such as piezoelectric components, in recent years, based on environmental considerations, research and development of lead-free ceramic materials containing no Pb have been actively carried out. [0003] Among these lead-free ceramic materials, niobate compounds, especially alkali niobate, have a high Curie point and a large electromechanical coupling coefficient, so they are considered promising as ceramic materials for piezoelectric components. [0004] However, since this alkali niobate is generally deliquescent, it has the disadvantage that it is difficult to store and manage. [0005] Therefore, conventionally, a piezoelectric ceramic composition con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/00H01L41/187H01L41/24H01L41/39
CPCC04B2235/768C04B2235/3201H01L41/187C04B2235/3293C04B2235/3232H01L41/43C04B2235/3286H01L41/39C04B35/495C04B2235/3227H01L41/1873C04B2235/3203C04B2235/3224C04B2235/3225C01G33/006C04B2235/3298C04B2235/3244H10N30/8542H10N30/097
Inventor 片山良子川田慎一郎
Owner MURATA MFG CO LTD
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