A method for purifying ceramic powder for electronic parts is described. Impurities can be easily removed by this method. Alkaline metals are removed from ceramic power for electronic parts

Murata, M.

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NASA TECHNICAL MEMORANDUM
	 NASA TM-77257
O
A METHOD FOR PURIFYING CERAMIC POWDER FOR ELECTRONIC PARTS
Mitsuo Murata
AUG 190
RESEIIIEI!
-aft
noan:
Translation of Japanese Patent No. 55- 19006, May 23, 1980, pp. 21-22.
(NASA-T"l-77257)
	 k METHOD FOR PURIFYINk,	 IJ83-30657
CERAMIC POWDER FOR ELECTRONIC PARTS
(National Aercnautics and Space
Administration) 6 p HC 402/11F A01 CS..L 11B
	 Unclas
G3/27 13180
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
WASHINGTON, D.C. 20546	 JUNE 1983
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A METHOD FOR PURIFYING CERAMIC POWDER
S. 11, 9094 Oa.
JUNE 1983
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Translation of Japanese Patent No. 55-19006, May 23, 1980, pp. 21-22.
A method for purifying ceramic powder
for electronic parts is described.
Impurities can be easily removed
by this method.	 This method removes
alkaline metals from ceramic power for
electronic parts.
OFD'.: {NAL	 r
OF POOR QUALITY
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Unclassified
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Veelaaaitied Unclassified 6
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TM-77257
OF POOR QUALITY
(19) Japanese Patent Office (JP)
(12) Patent Report (B2)
(11) Patent No. Sho 55(1980)-19006
n %
(24)(44)	 Publication hate:
(21) Application No.:
(22) Application hate:
Kokai No..
(43) Kokai hate:
(51)	 Int. C1.3.
Sequence Nos. for Office Use:
Number of Inv ent ions:
(Tot a. 2 Pages)
May 23, 1980
Sho 48(1973)-65669
June 11, 1973
Sho 50(1975)-13900
February 13, 1975
H 01 B 3/12
//C 04 B 33/24
7216-5E
7351-4G
1
(54) A METHOD FOR PURIFYING CERAMIC  POWDER FOR
ELECTRONIC PARTS
(7 `)	 lnventor:
(71)	 Appl icailt :
(50 Referetwes :
Mitsuo Murata
Murata Mfg. Co., Ltd.,
16 Kcida Nishi_jin-cho,
Nagaokakyo-shi
Murata Mfg. Co., Ltd.
16 Kaida Nishijin-rho,
Nagaokakyo-shi
Japanese Patent No. Sho
31 (1456)-6385 (JP, 131)
Japanese Patent No. Sho
31 (1 C)56) -10930 (JP, Hl )
"Ti'inslator's note: numbers in mai-oins refer to the foreign text page.
1
(57) Scope of Patent Claim
A method for purifying ceramic powder for electronic parts
	 /21*
which is characterized by the fact that impurities are
dissolved and removed from ceramic powder by adding a dilute
acid to ceramic powder with a composite perovskite structure
which is made from a titanate, zircinate, and stannate and
is synthesized by a solid phase reaction.
Detailed Explanation of Invention
This invention pertains to a method for purifying a
ceramic powder used in electronic parts which is synthesized
by a solid phase reaction.
In general, ceramic powders for electronic parts, such
as BaTiO 3 , CaZrO 3 , BaSnO 3 , etc., are synthesized by a solid
phase reaction used in mass production. Nevertheless, the
starting powder contains impurities, such as alkaline metals,
etc., and ceramic powder synthesized by a solid phase reaction
of this starting material is inadequate for electronic parts.
Therefore, when ceramic powder for electronic parts that is
very pure is necessary, very expensive pure starting
materials must be employed or a liquid phase reaction,
which is not suitable for mass production, must be carried out.
In either case, production cost is high and therefore, the methods
are impractical.
This invention solves the aforementioned problems. This
f 
invention presents a method for purifying a ceramic powder
used for electronic parts whereby impurities, particularly
alkaline metals, contained in ceramic powder that has been
synthesized by a solid phase reaction can be easily removed.
*Numbers in margin indi 	 a foreign pagination
2
!•
That is, this invention is a method for dissolution and
removal of impurities in ceramic powder by adding a dilute
acid to ceramic powder with a composite perovskite structure,
which is made from a titanate, a stannate. and a zirconate
and has been synthesized by a solid phase reaction.
This invention will not be explained in detail with examples.	 i\
0.1 N acetic acid was added to ceramic powders of BaTiO3,
CaZrO 3 , and BaSnO 3 . Then the powder was washed several
times with distilled water. The Na and K conterts were measured
after the purifying treatment. A comparison of the Na and K
contents before and after treatment is shown in Table 1.
Furthermore, ceramic powders used in the aforementioned
examples were synthesized with the following treatments.
(1) BaTiO 3 : BaCO 3 and TiO 2 were each weighed out so that the
molar ratio would be 1:1. After they were mixed in a pot mill
with the wet method, the powder was dried and baked for 2 hours
at a temperature of 1200 C.
(2) CaZrOc : CaCO 3 and ZrO 2 were each weighed out so that the
molar ratio would be 1:1. The same treatment as in (1) was
then carried out.
(3) BaSnO 3 : BaCO 3 and SnO 2 were weighed out so that the
molar ratio would be 1:1. The same treatment as in (1) was
then carried out.
OF POCK QUALITY
Table 1
content (wt%)
before treatment after treatmentsample impurities
BaTiO 3 Na2O
K2O
CaZrO 3 Na2O
BaSnO 3 Na2O
	
0.10	 0.05
	
0.05	 0.02
	
0.20	 0.08
	
0.21	 0.09
3
4As can be seen from the results in Table 1, 50% or more of 	 /22
the alkaline metal impurities contained in the ceramic powder are
removed when the method in this invention is performed. Furthermore,
although dilute acetic acid was employed in the aforementioned
examples, other acids, such as dilute hydrochloric acid,
dilute nitric acid, etc, can be used. Moreover, although only
the case where BaTiO 3 , CaZrO 3 and BaSnO 3 were used was shown,
the method in this invention can be used on powders for
electronic parts with a composite perovskite structure made from
other titanates, stannates, and zirconates, such as SrTiO 3 , CaTiO3,
PbTiO 3 , BaZrO 3 , SrZr0 3 , PbZr() 31 SrSnO 3 , and CaSnO3.
Akaline metals can be removed from ceramic powder for
electronic parts with the method in this invention. Therefore,
commercial ceramic powders can be easily and inexpensively
obtained with a high degree of purity. Moreover, there is
an advantage with this invention in that the cost of the
electronic part is also reduced. Consequently, this invention
is useful from an industrial viewpoint.


A method for purifying ceramic powder for electronic parts

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