| 摘要 |
<p>The invention refers to glass compositions for the production of lead-free crystals, having a density greater than 2.4g/cm3, a refractory index of at least 1.51 and high resistance to chemical attack, characterized by comprising, by weight: from about 50% to about 75% of SiO2; from about 0,1% to about 1% of As2O3; from about 5% to about 15% of K2O; from about 2% to about 6% of Na2O; from about 3% to about 12% of CaO; from about 0,1% to about 5% of BaO; from about 0,1% to about 10% of Nb2O5; and, up to 5% of other elements.</p> |
| 申请人 |
COMPANHIA BRASILEIRA DE METALURGIA E MINERACAO;PEREIRA, ANTONIO, TELHADO;MENEZES, ANDREIA, DUARTE;STRAUSS, FREDERICO, WERNER;DA SILVA, DEBORA |
发明人 |
PEREIRA, ANTONIO, TELHADO;MENEZES, ANDREIA, DUARTE;STRAUSS, FREDERICO, WERNER;DA SILVA, DEBORA |
