Ceramics Processing Laboratory

Japanese Page

Outline

The properties of sintered bodies after some ceramics processing largely depend on the ceramic starting materials. From this viewpoint, we are conducting research which contributes to the creation of hyperfunctional ceramics material through synthesizing high performance ceramic raw materials.

Projects

1. Property evaluations on the high temperature material of composite by interface control
   (1998 - 2000 FY)
2. Evaluation of ultra high pure oxide ceramics with high corrosion resistance at high temperatures
   (1994 - 1998 FY)
3. Development and evaluation of new function of particle systems by simultaneously controlling morphology and structure
   (1997 - 1999 FY)
4. Ceramics composite particles
   (1994 - 1998 FY)
5. Research and development on synergy ceramics
   (1994 - 1998 FY)
6. Research on super conductivity
   (1998 - 2002 FY)
7. Fabrication process of functional ceramic fibers
   (1999 - 2001 FY)
8. Research and development on synergy ceramics
   (1999 - 2003 FY)
9. Design of ceramics materials
   (1999 - 2000 FY)

Staffs

Research Manager	Mutsuo SANDO	msando@nirin.go.jp
	Kazuo NAKAMURA
	Masanobu AWANO
	Shoji KAWAKAMI
	Atsuya TOWATA
	Yasumasa TAKAO
	Yoshinobu FUJISHIRO

Summary of laboratory

Ceramics are manufactured by forming raw materials such as inorganic powders and so on, and consolidating at high temperatures. Performance of resulting ceramics varies according to the properties of starting raw materials. Properties of the raw materials are decided by the composition of the materials, purity, morphology, size, inner structure, surface property of the raw materials. We are conducting research on the synthesis of ceramic raw materials of which properties are artificially controlled in order to improve the performance of resulting ceramics. The following are recent topics of our research activities.

• Impurities are condensed at the grain boundary, and cause the degradation of creep resistance and corrosion resistance. To prepare ultra high pure alumina raw material, a study on a refinement method by zone melting of a stable organic metal with low melting temperature is carried out.
• Ceramics sensor has variable properties according to the addition of sensitizer and the control of porous structure. Development of a multi layered sensor with high selectivity was undertaken. A composite powder was prepared, by charging semiconductor particles and sensitizer particles with the opposite polarity, and mixing each other. The composite powder was accumulated on a substrate by electrostatic force.
• Ceramic nano-composite, having nano level particles dispersed in a ceramics matrix, has high creep resistance at high temperatures. A ceramic fiber with nano-composite structure was developed. The stringy liquid was prepared from aluminum alkoxide and yttrium alkoxide, and alumina matrix and YAG dispersoid were in situ synthesized from the liquid by sintering. Alpha-alumina fine particles were mixed into the liquid, the resulting matrix grain in the fiber became finer. The strength of fiber was appreciably improved.
• An engineering ceramics in which second phase particles of nano size is dispersed can drastically improve strength and can obtain functional ability of second phase. An engineering ceramics with stress sensing ability was developed by dispersing magnetostrictive nano particles which change magnetization according to stress.

 

 

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