| 摘要 |
<p>The instant invention is directed to the production of opaque glass-ceramic articles containing canasite crystals as the predominate crystal phase exhibiting strong bright colors. The desired color is obtained through the addition of a colorant system to the precursor glass composition utilized for the production the canasite glass-ceramic. Opaque glass ceramic articles exhibiting bright colors ranging from purple-to-blue-to-green are obtained through the addition of a colorant system consisting essentially, expressed in weight percent, of about 0.02%-1.5% total of at least one member selected from the group consisting of Cr2O3 and Co3O4, with the maximum amount of either member being about 1.0% Another embodiment is directed towards the production of opaque glass-ceramic articles exhibiting strong bright colors yellow-to-orange-to-red-to-brown colors. The desired color is obtained through the addition, under mildly reducing conditions, of a colorant system consisting essentially, expressed in weight percent, of about 0.1%-2,5% of at least one member selected from the group consisting of CdS, Se and CdO, with the maximum presence of each member being about 1.5%. A final embodiment is directed towards the production of opaque glass-ceramic articles exhibiting a strong bright black coloration. The desired color is obtained through the addition, under reducing conditions of a colorant system consisting essentially of about 0.01%-1.0% of NiO.</p> |
