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公开(公告)号：US5256601A
公开(公告)日：1993-10-26
申请号：US957359
申请日：1992-10-07
摘要： A silver halide photochromic glass hasa. a clear luminous transmittance of about 90%,b. A darkened luminous transmittance at 20.degree. C. below about 25%.c. A fading rate at 20.degree. C. such that, after a five minute fading interval, the glass exhibits a percent faded luminous transmittance that is no more than the darkened luminous transmittance percentage plus 15. The glass has an R.sub.2 O--Al.sub.2 O.sub.3 --B.sub.2 O.sub.3 --SiO.sub.2 base composition, contains as additives, in percent by weight, 0.1-0.3% Ag, 0.25-1.0% Cl, 0-0.2% Br, 0.25-1.0% Cl+Br, the ratio of Ag:(Cl+Br) being 0.15-0.65, 0.003-0.015% CuO and 0.1-1.0% PbO and the total R.sub.2 O content is 8-13.5%, wherein R.sub.2 O consists of Li.sub.2 O+Na.sub.2 O +K.sub.2 O.
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公开(公告)号：US6071563A
公开(公告)日：2000-06-06
申请号：US50770
申请日：1998-03-30
CPC分类号： C23D5/00
摘要： A method of protecting a metal against embrittlement when the metal is exposed to carbon or sulfur at an elevated temperature, the method comprising forming a thin, adherent, continuous coating of a glass on the surface of the metal prior to exposure to carbon or sulfur at an elevated temperature.
摘要翻译： 当金属在高温下暴露于碳或硫时，保护金属免受脆化的方法，该方法包括在暴露于碳或硫之前在金属表面上形成薄的，粘附的连续的玻璃涂层 温度升高。
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公开(公告)号：US3936287A
公开(公告)日：1976-02-03
申请号：US437008
申请日：1974-01-28
CPC分类号： C03C10/0045 , C03C21/00
摘要： This invention is concerned with glass-ceramic articles having compositions within a very narrowly-delimited area of the MgO-Al.sub.2 O.sub.3 -B.sub.2 O.sub.3 -SiO.sub.2 field and having alpha-quartz and sapphirine as the principal crystal phases, resulting from nucleation through a combination of TiO.sub.2 and ZrO.sub.2. Upon contacting such articles with lithium ions at an elevated temperature, said lithium ions will replace magnesium ions on a two Li.sup.+-for-one Mg.sup..sup.+2 basis within the crystal structures, thereby providing a unitary glass-ceramic article having an integral surface layer wherein the principal crystal phase is a lithium-stuffed beta-quartz solid solution. That transformation of crystal phases results in compressive stresses being set up within the surface layer as the articles are cooled. Through the careful control of composition, crystallization treatment, and the parameters of the replacement reaction in the crystal structures, a tremendous degree of stored elastic energy can be developed within the articles such that they will demonstrate frangibility when fractured but will not exhibit undesirable spontaneous breakage and/or spalling.
摘要翻译： 本发明涉及具有在MgO-Al2O3-B2O3-SiO2领域的非常狭窄的区域内的组成的玻璃陶瓷制品，并且具有α-石英和蓝宝石作为主要晶相，这是由于通过TiO 2和 ZrO2。 在升高的温度下使这些物品与锂离子接触时，所述锂离子将在晶体结构内以两个Li +一Mg ++取代镁离子，从而提供一种单一的玻璃陶瓷制品，其具有 其中主晶相是锂填充的β-石英固溶体的整体表面层。 晶体相的转变导致当制品被冷却时在表面层内形成压应力。 通过仔细控制组合物，结晶处理和晶体结构中的置换反应参数，可以在制品内形成大量储存的弹性能，使其在断裂时显示脆性，但不会显示出不希望的自发断裂 和/或剥落。
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