摘要:
This invention relates to the use of an open, plain Leno Aramid fiber weave wrapped around the armor base plate in such a fashion that the wrap on the strike face surface is bonded with a thermoset resin while the continuous fibers around the back are left resin-free and able to distort, allowing localized deformation while keeping the remainder of the “wrap” holding tight. This wrap technique keeps the composite backing tight to the strike surface while allowing all of the benefits of localized fiber movement and tensile failure on the backside of the target. Other high performance fibers, such as fiberglass, also woven in a Leno weave and applied in the same method will yield similar results. This invention also relates to the placement of a “slip layer” between the fiber surface and the polymer coating of an armor system. This layer, consists of Teflon, silicone, or other low friction, bonding resistant materials, and prevents intimate bonding of the polymer coating to the fiber back and allows a low friction slip surface that isolates the polymer from the trauma of fiber deformation and breakage.
摘要:
A method of increasing mean time between cleans of a plasma etch chamber and chamber parts lifetimes is provided. Semiconductor substrates are plasma etched in the chamber while using at least one sintered silicon nitride component exposed to ion bombardment and/or ionized halogen gas. The sintered silicon nitride component includes high purity silicon nitride and a sintering aid consisting of silicon dioxide. A plasma processing chamber is provided including the sintered silicon nitride component. A method of reducing metallic contamination on the surface of a silicon substrate during plasma processing is provided with a plasma processing apparatus including one or more sintered silicon nitride components. A method of manufacturing a component exposed to ion bombardment and/or plasma erosion in a plasma etch chamber, comprising shaping a powder composition consisting of high purity silicon nitride and silicon dioxide and densifying the shaped component.
摘要:
This invention relates to the use of an open, plain Leno Aramid fiber weave wrapped around the armor base plate in such a fashion that the wrap on the strike face surface is bonded with a thermoset resin while the continuous fibers around the back are left resin-free and able to distort, allowing localized deformation while keeping the remainder of the “wrap” holding tight. This wrap technique keeps the composite backing tight to the strike surface while allowing all of the benefits of localized fiber movement and tensile failure on the backside of the target. Other high performance fibers, such as fiberglass, also woven in a Leno weave and applied in the same method will yield similar results. This invention also relates to the placement of a “slip layer” between the fiber surface and the polymer coating of an armor system. This layer, consists of Teflon, silicone, or other low friction, bonding resistant materials, and prevents intimate bonding of the polymer coating to the fiber back and allows a low friction slip surface that isolates the polymer from the trauma of fiber deformation and breakage.
摘要:
A thrust bearing assembly comprising a rotating bearing runner and a stationary bearing carrier, the carrier defining a plurality of thrust pad sites annularly around the carrier, with a thrust pad disposed at a site and with the carrier constraining movement of the thrust pad in a direction generally radial to the longitudinal axis of the runner while allowing the thrust pad to move in a direction generally parallel to the longitudinal axis. An embodiment comprises a rotating bearing runner having a wear resistant face and a stationary bearing carrier defining cavities disposed annularly around the carrier. A deflection element (e.g., Belleville washer) is disposed in a cavity and a pad is disposed over the deflection element. The pad is at least partially disposed within the cavity. The wear resistant face contacts the pad. Another embodiment rigidly connects pads disposed on opposite sides of a stationary bearing carrier.
摘要:
In the spring assisted articulating window armor system invention, lightweight opaque armor is stored in the down position when not needed. When the armor is needed, a locking pin is released and two air cylinders or gas springs move the armor into the protected position. Then the upper half is hinged to the lower half and the upper armor is raised into position and the locking pin is reinstalled to hold the armor in position. The system in the down position allows for a complete unobstructed viewing area. In the semi-deployed or partial up position, the system provides partial ballistic coverage for the occupant, and still allows for some occupant vision capability. In the fully deployed, or full up position, the system provides full ballistic coverage for the occupant.
摘要:
The adjustable louvered armor window system invention comprises angled louvers made of the lightweight opaque armor. For the front window a viewing window of ballistic glass can be installed, the rear or sides could be solid armor. The louvers have overlaps to provide for gap protection. When no threat is present, the louvers are in the full open position. Once a threat is detected, then the louvers are closed. The movement of the louvers can be accomplished by a push/pull cable, hydraulic pressure, air pressure or other means. The system in the fully open position allows for a complete unobstructed viewing area. In the semi-deployed or partial down position, the system provides partial ballistic coverage for the occupant, and still allows for some occupant vision capability. In the fully deployed, or fully closed position, the system provides full ballistic coverage for the occupant, with a small viewing area or port, which is made of ballistic grade transparent armor.
摘要:
This disclosure describes sintered bodies comprising about 90 wt % to about 99 wt % of boron carbide, having a B:C atomic ratio ranging from 3.8 to 4.5:1; 0 to 1 wt % free carbon; 0 to 1 wt % BN or AlN, remainder an oxide binder phase; said sintered body having a uniform microstructure composed of substantially equiaxed grains of said boron carbide; the oxide binder phase comprising at least a rare earth aluminate and optionally Al2O3 or other ternary or binary phases of rare earth oxide-alumina systems; the binder phase being present in form of pockets at the multiple grain junctions and the density of no more than 2.6 g/cm3. Also described is a manufacturing process for the above described substantially pore-free, sintered boron carbide materials with high strength and fracture toughness, which can be used for production of large-area parts. This is achieved by liquid phase low temperature-low pressure hot pressing of boron carbide in an argon atmosphere.
摘要翻译:本公开内容描述了包含约90重量%至约99重量%的碳化硼的烧结体,其具有3.8至4.5:1的B:C原子比; 0至1重量%游离碳; 0至1wt%的BN或AlN,余下为氧化物粘结相; 所述烧结体具有由所述碳化硼的基本上等轴晶粒组成的均匀微观结构; 所述氧化物粘结相包含至少稀土铝酸盐和任选的Al 2 O 3 3或稀土氧化物 - 氧化铝体系的其它三元或二元相; 粘结相以多个晶界处的凹穴形式存在,密度不超过2.6g / cm 3。 还描述了上述基本上无孔的烧结碳化硼材料的制造方法,其具有高强度和断裂韧性,可用于生产大面积部件。 这是通过在氩气氛中的液相低温低压热压碳化硼来实现的。
摘要:
A pigmented silicon nitride composition suitable for hot pressing into near shape articles of manufacture having a cosmetically uniform color. The composition comprises high purity, sub-micrometer, alpha silicon nitride powder mixed with a sintering aid and a pigmenting material. In a preferred embodiment the pigmenting material comprises molybdenum carbide, although carbides of other elements are applicable as well. The resulting hot pressed article is cosmetically superior to non-pigmented silicon nitride. Such articles are especially useful for processing semiconductor components where appearance in the form of color uniformity is a strict requirement for the manufacturer and the customer.
摘要:
An orthodontic bracket includes a ceramic body having an elongated channel, and a metallic archwire slot liner that is received in the channel. The liner is affixed to the ceramic body by a brazing process using a brazing material such as platinum, silver, an active metal or a mixture of molybdenum and manganese. Alternatively, the liner is formed in situ in the bracket body.
摘要:
A process for soldering without using flux and producing a void-free joint comprises the steps of melting the solder in a reducing gas atmosphere such as hydrogen, evacuating the gas to permit the solder joint to expell any trapped gas, then reintroducing the reducing gas and cooling the solder joint. The reducing gas obviates the use of flux to avoid oxidation from interfering with the wetting of the materials to be joined. The materials may be metalized prior to soldering to permit wetting of certain materials such as ceramic.