Several binders have been evaluated to determine their effect on high frequency dielectric loss. Alumina ceramics have been powder pressed with different binder levels, sintered, and then the dielectric loss (tan δ = Q-1) has been measured at approximately 9·5 GHz. The quality factor Q was determined and significant differences were observed between samples made with different binders. The differences are caused by the different levels of residual porosity left by the different binders. In addition, differences in levels of impurities in the binders may also influence Q. Selected samples were measured for green body strength as a function of binder content.
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References
1.
BORTZMEYERD.: ‘Ceramic processing’, (ed. TerpstraR. A. et al), 102–146; 1995, London, Chapman and Hall.
2.
O'BRYANH. M., THOMSONJ., and PLOURDEJ. K.: Ber. Dt. Keram. Ges., 1978, 55, (7), 348–351.
3.
PENNS. J., ALFORDN. McN.TEMPLETONA., WANGX., XUM., REECEM., and SCHRAPELK.: J. Am. Ceram. Soc., 1997, 80, (6).
4.
ALFORDN. McN. and PENNS. J.: Int. patent publ.no. WO 97/23430, 3 July 1997.
5.
ALFORDN. McN. and PENNS. J.: J. Appl. Phys., 1996, 80, (10), 5895–5898.
6.
ALFORDN. McN. and PENNS. J.: Int. patent pub!.no. WO 97/23429, 3 July 1997.
7.
CARNEIROF.: ‘Une nouvelle methode d'essai pour determiner la resistance a la traction du beton’, Reunion des Laboratoires d'Essai de Materiaux, Paris, June 1947.
8.
KAJFEZD. and GUILLONP.: ‘Dielectric resonators’; 1986, Zurich, Artech House.
