Abstract:
Compositions, articles and methods for making such articles are disclosed. The compositions, articles and methods include calcium aluminate materials consisting essentially of a main phase of CaAl 4 0 7 and having a low coefficient of thermal expansion produced by utilizing an additive and firing to temperatures below about 1600° C.
Abstract:
Crystallizable glasses, glass ceramics, IXable glass ceramics, and IX glass ceramics are disclosed. The glass ceramics exhibit β spodumene ss as the predominant crystalline phase. These glasses and glass ceramics, in mole%, include: 62-75 Si O 2 ; 10.5-17 Al 2 O 3 ; 5-13 Li 2 O; 0-4 ZnO; 0-8 MgO; 2-5 TiO 2 ; 0-4 B2O 3 ; 0-5 Na 2 O; 0-4 K 2 O; 0-2 ZrO 2 ; 0-7 P 2 O 5 ; 0-0.3 Fe 2 O 3 ; 0-2 MnOx; and 0.05-0.2 SnO 2 . Additionally, these glasses and glass ceramics exhibit the following criteria a ratio: [Li 2 O+Na 2 O+K 2 O+MgO+ZnO] [Al 2 O 3 +B 2 O 3 ] between 0.7 to 1.5; a ratio: [TiO 2 +SnO 2 ] [SiO 2 +B 2 O 3 ] greater than 0.04. Furthermore, the glass ceramics exhibit an opacity ≥ about 85% over the wavelength range of 400-700nm for an about 0.8mm thickness and colors an observer angle of 10° and a CIE illuminant F02 determined with specular reflectance included of a* between -3 and +3, b* between -6 and +6, and L* between 88 and 97.
Abstract translation:公开了可结晶玻璃,玻璃陶瓷,IXable玻璃陶瓷和IX玻璃陶瓷。 玻璃陶瓷显示出β锂辉石为主要结晶相。 这些玻璃和玻璃陶瓷(摩尔%)包括:62-75SiO 2; 10.5-17 Al2O3; 5-13 Li2O; 0-4 ZnO; 0-8 MgO; 2-5 TiO2; 0-4 B2O3; 0-5 Na2O; 0-4 K2O; 0-2 ZrO2; 0-7 P2O5; 0-0.3 Fe2O3; 0-2 MnOx; 和0.05-0.2 SnO2。 另外,这些玻璃和玻璃陶瓷的比例为:0.7〜1.5的[Li 2 O + Na 2 O + K 2 O + MgO + ZnO] [Al 2 O 3 + B 2 O 3] 比例:[TiO 2 + SnO 2] [SiO 2 + B 2 O 3]大于0.04。 此外,玻璃陶瓷在400-700nm的波长范围内表现出大约85%的不透明度,厚度约为0.8mm,并且观察角度为10°,CIE照明物F02由包含a * 3和+3,b *在-6和+6之间,L *在88和97之间。
Abstract:
T This disclosure teaches the use of low density, "open"-structure glasses as backing glasses, behind glass-ceramic strike-faces, in transparent armor composite windows. These low density "open-structure ' glasses are sometimes referred to as "anomalous" glasses. For transparent armor applications both silica, including fused silica, and borosilicate glasses can be used as backing glass. These backing glasses provide improved ballistics performance over that of standard commercial soda lime backing glass. These glasses should be used either in their as-formed state (e.g. float surfaces) or should be finished using a process designed for minimizing sub-surface damage.
Abstract:
The invention relates glass ceramic articles suitable for use as electronic device housing or enclosures which comprise a glass-ceramic material. Particularly, a glass-ceramic article housing/enclosure comprising a glass-ceramic material exhibiting both radio and microwave frequency transparency, as defined by a loss tangent of less than 0.5 and at a frequency range of between 15 MHz to 3.0 GHz, a fracture toughness of greater than 1.5 MPa⋅m ½ , an equibiaxial flexural strength (ROR strength) of greater than 100 MPa, a Knoop hardness of at least 400 kg/mm 2 , a thermal conductivity of less than 4 W/m°C and a porosity of less than 0.1 %.
Abstract:
Methods and apparatus for producing a gallium nitride semiconductor on insulator structure include: bonding a single crystal silicon layer to a transparent substrate; and growing a single crystal gallium nitride layer on the single crystal silicon layer.
Abstract:
The invention is directed to direct bonding of a glass-ceramic to one or a plurality glass layers to form a transparent laminate, thereby eliminating one or more of the polymer interlayers between the glass-ceramic and glass layer, and between the individual glass layers of the transparent laminate when more than one glass layer is present. The direct bonding eliminates or minimizes any deleterious effects of temperature and humidity that can occur when polymer interlayers are used to effect glass-ceramic/glass and/or glass/glass bonding in transparent laminates. The bonding is carried out in ambient atmosphere at a temperature between the softening and strain points of the "softer" or "lower softening point" material, typically the glass material, and is carried out without the use a polymer interlayer or adhesive, or the application of a voltage. The glass-ceramic/glass laminates can be used in transparent armor applications, particularly when combined with a spall catcher layer that is bonded to the glass layer furthest from the glass-ceramic layer.
Abstract:
The invention is directed to transparent glass-ceramic materials for use in transparent armor systems. Applications include armor systems for ground vehicles and aircraft as well as personal protective equipment. The glass-ceramic materials according to the invention exhibit a ballistic limit vs. areal density line slope of as least 1.0, preferably 1.1 or greater, and more preferably 1.2 or greater.
Abstract:
The invention is directed to highly crystalline, frit sintered glass ceramic compositions having a coefficient of thermal expansion in the range of 85 115 x 10 -7 °C. The primary crystal phases of the glass ceramics of the invention possess a cyclosilicate structure. The glass ceramic of the invention are useful as metal to metal, metal to ceramic and ceramic to ceramic sealing agents, and also as high performance coating for metals and ceramics. In their broadest composition the glass ceramic contain, in weight percent, 30-55% SiO 2 , 5-40% CaO, 0-50% BaO, 0.1-10% Al 2 O 3 , and 0 40% SrO, wherein the sum of CaO + BaO + SrO is in the range of 35-65 wt. %. Optionally, the glass ceramic compositions may contain at least one from the group of >0 15 wt. % MgO and >0 10 wt. % ZnO. Also optionally, the glass ceramic compositions may contain >0 10 wt. % of at least one transition metal or rare earth metal oxide.
Abstract:
The invention is directed to highly crystalline, frit sintered glass ceramic materials and seals made using them that are suitable for solid oxide fuel cell applications. The seals have a coefficient of thermal expansion in the range of 70-130 x 10 -7 °C, preferably 85-115 x 10 -7 °C. The glass ceramic materials have a crystalline component and a glass component, the crystalline component being >50% of the glass ceramic and the glass component being 75%. Regarding the crystalline component only, >50% of the crystals in the crystalline component of the glass ceramic has a structure selected from the structural groups represented by walstromite, cyclowollastonite, µ (Ca,Sr)SiO 3 , kalsilite, kaliophilite and wollastonite (the primary crystalline phase) and the remaining
Abstract:
A semiconductor-on-insulator structure including first and second layers which are attached to one another either directly or through one or more intermediate layers. The first layer includes a substantially single crystal germanium semiconductor material while the second layer comprises a glass or a glass-ceramic material having a linear coefficient thermal of expansion (25-300°C) which is within the range of +/- 20x10 -7 /°C of the linear coefficient thermal of expansion of the germanium first layer.