化學(xué)配方數(shù)據(jù)庫(kù)
| 配方類(lèi)型： |
CERAMICS AND GLASS |
| 配方說(shuō)明： |
Zero-Shrinkage Ceramics |
| 配方組成： |
Spodumene/60
This body fired to 1970F. (1077C.) has zero absorption. The
shrinkage is also zero if the optimum pressure is used in fabrication
(22 tons per sq. in. using 200-mesh materials). Additions of clay up to
15% decrease the pressure required to 10 tons per sq. in. at which zero
shrinkage can be obtained. This type ceramic has a dielectric constant
of 6.4, a loss factor of 0.029 and a coefficient of linear thermal
expansion of 2.02x10^-^6 (77 to 842F., 25 to 450C.). |
| 配制方法： |
This ceramic depends on the formation of the crystalline phase of lead alumina silicate. It is dense and has zero absorption at 1700F.
(927C.). At 1950F. (1066C.) this ceramic is still dense and not overfired. thus having an unusually long firing range. There is some selfglazing at 1950F. (1066C.) and this self-glazing mechanism becomes pronounced at 1975F. (1079C.) This ceramic has zero shrinkage with the optimum forming conditions (33 tons per sq. in. using 200-mesh materials). The dielectric constant is 5.8 and the loss factor 0.006, thus affording a Grade L-5 ceramic with zero shrinkage. |
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