Ultradźwiękowe pomiary porowatości technicznych tworzyw glinokrzemianowych

• Autorzy: Ranachowski P. , Malecki I.

Warianty tytułu

EN

Evaluation of ceramic materials porosity by measurements of velocity of ultrasound longitudinal waves

• Języki publikacji: EN

Abstrakty

EN

The general relations between the elastic modules and velocity of longitudinal acoustic wave ' continuous loss-less medium were used as the reference point for the analysis. The attenuat ition of the ultrasound wave was expressed by the density o fthe cross-sections caused by the inclusions. The porous material was treated as the continuous substitute medium with the elastic modules being the function of the properties of the carrier non-porous material and the parameters of the porosity. The following parameters were taken into account: the degree of porosity as ratio of the porous and carrier materials densities, the distribution o fpores size, the shape of t spheroidal por es. The velocity o fpropagation of the longitudinal acoustic wave was presented by the complex formula related with the elastic properties of the substitute medium and the carrier material. The influence of the attenuation on the wave propagation velocity was neglected. Several ceramics were investigated. The parameters of the porosity were evaluated by the optical,m icroscopic observation. The elastic modules of the nonporous carrier materials are well known. The velocity of ultrasound wave was measured with the usual acoustical methods. The results of the measurements confirm the theoretical investigation concerning the influence of the porosity on the mechanical properties of the ceramics.

• Wydawca: Silesian Division of Polish Acoustical Society
• Czasopismo: Molecular and Quantum Acoustics
• Rocznik: 1998
• Tom: Vol. 19
• Strony: 239--250
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Ranachowski P.

autor

Malecki I.