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ean Reference Materials  LGC, Unit

Development of reference materials for thermophysical properties of fine ceramics.

Accession number;00A0747414

Title;Development of reference materials for thermophysical properties of fine ceramics.

Author;OGAWA MITSUE(Jfcc)   MUKAI KAZUO(Jfcc)   FUKUI TAKEHISA(Jfcc)  

Journal Title;Thermophys Prop

Journal Code:X0031A

ISSN:0911-1743

VOL.20th;NO.;PAGE.511-514(1999)

Figure&Table&Reference;FIG.6, TBL.1, REF.5

Pub. Country;Japan

Language;Japanese

Abstract;Fine ceramics are expected as high temperature structural materials because of their stability at high temperature. If the fine ceramics are used at high temperature, the high accuracy evaluation of thermophysical properties is necessary. Then a reference material is indispensable for high accuracy measurement. However reference materials for thermophysical properties are very few and the development of them is expected. Japan Fine Ceramics Center(JFCC) has been studying to establish thermophysical reference materials. We already developed a thermal diffusivity reference material named "TD-AL"(Al2O3) in collaboration with National Research Laboratory of Metrology, which has been supplied to industry and scientific community from 1998. It is not enough as only a thermal diffusivity reference material for the high accuracy evaluation of thermophysical properties. In this study it is considered the silicon nitride is candidate for thermal diffusivity reference material and the alumina for the thermal expansion reference material. Then the homogeneity and the stability of these materials were evaluated. We are studying REFERCERAM SN1(Si3N4) as a candidate for the thermal diffusivity reference material. Table 1 shows the basic properties of SN1. The homogeneity of the thermophysical properties in the sintered body is primarily important for a reference material. The specimens were cut out from a plate as shown in fig.1. Thermal diffusivity of each specimen was measured at room temperature using an advanced laser flash apparatus with several new technologies in order to measure with smaller uncertainty. The deviations of thermal diffusivity from mean value are plotted in fig.2 and fig.3. The deviation was within .+-.2.5% and small enough for qualified to a reference material.... (author abst.)

High-temperature stability in yttria-stabilized zirconia

Mitsue Ogawa

Materials Research and Development Laboratory, Japan Fine Ceramics Center, Japan

Funded by:

 Japanese National Project Nanotechnology Program - Nanotechnology Material Metrology Project supported by the New Energy and Industrial Technology Development Organization (NEDO), and the Japanese National Project Research on measurement technology and reference materials for thermophysical properties of solids supported by Special Coordination Funds for Promoting Science and Technology.