Abstract:
Friction material pads for use in a brake system with an aluminum-metal matrix composite rotor wherein a brake application can create operational temperatures that approach 450 DEG C. The formulation of the composition for the friction pads is generically a basic non-asbestos organic formula modified to include a high abrasive content, solid lubricant package, and a porous copper powder. The porous copper powder which makes up from 2-18 percent by weight the friction pads has a nominal diameter of 0.20 mm. The porous copper powder proportionally responds to temperature and mechanical forces generated during a brake application by deforming and smearing to aid in the formation of a glaze between the engaging surfaces of the friction pads and aluminum-metal matrix composite rotor. This glaze prevents scoring of the aluminum-based rotor while at the same time maintaining a substantial stable coefficient of friction of approximately 0.6 during brake applications over a wide range of speeds and deceleration rates.
Abstract:
The present invention provides a process for recovering arsenic acid from a starting mixture comprising sulfuric and arsenic acids and water. In step (a), the starting mixture is treated with a sulfur (IV) compound which will reduce the arsenic acid to arsenic (III) compound under conditions sufficient to substantially convert the arsenic acid to arsenic (III) wherein the resulting mixture comprises arsenic (III) compound, the sulfur (IV) compound, sulfuric acid, and water. In step (b), the resulting mixture is purged with inert gas to substantially remove the sulfur (IV) compound from the mixture wherein the purged mixture comprises the arsenic (III) compounds, sulfuric acid, and water. In step (c), the purged mixture is treated under conditions sufficient to substantially separate the arsenic (III) compounds from the purged mixture. In step (d), the separated arsenic (III) compound is reacted with an oxidizing agent to substantially convert arsenic (III) compound to arsenic acid wherein the final mixture comprises arsenic acid, unreacted oxidizing agent, and water. In step (e), impurities are removed from the final mixture to provide substantially pure aqueous arsenic acid. The recovered arsenic acid may be used for example as a raw material for the production of CCA wood preservative. The purged mixture which is sulfuric acid may be reused for example in the process of commonly assigned U.S. Patent 5,089,241.
Abstract:
This invention relates to a blend comprising a polyester, polycarbonate and an amine functionalized elastomer and optionally an effective amount of an effective graft coupling agent.
Abstract:
This invention relates to polymers having non-linear optical properties which polymers include fluorene moieties having at least one electron accepting group and at least one electron donating group substituted to different phenyl rings of the fluorene moiety (I), wherein: A is an electron withdrawing substituent; D is an electron donating substituent; R and R are the same or different and are divalent conjugated organic or inorganic moiety; m, n and p are the same or different at each occurrence and are integers from 1 to 4 wherein the sum of p and n, as well as the sum of p and m, is equal to 4; k and o are the same or different at each occurrence and are integers from 1 to 5 wherein the sum of k and o is equal to 5; i and j are the same or different and are 0 or an integer from 1 to 5; R is the same or different at each occurrence and is any substituent which does not adversely affect the non-linear optical properties of the polymer unduly; x and y are the same or different and are 0 or an integer from 1 to about 10; T and Z chosen to have general structures of polyesters, polycarbonates, polyamides, polyethers, polyurethanes, polyimides, epoxyresins.
Abstract translation:本发明涉及具有非线性光学性质的聚合物,该聚合物包括具有至少一个电子接受基团的芴部分和至少一个被芴部分(I)的不同苯环取代的给电子基团,其中:A是吸电子 取代基; D是给电子取代基; R 1和R 2相同或不同,为二价共轭有机或无机部分; m,n和p在每次出现时相同或不同,为1〜4的整数,其中p和n之和以及p和m之和等于4; k和o在每次出现时相同或不同,并且是1至5的整数,其中k和o的和等于5; i和j相同或不同,为0或1至5的整数; R 3在每次出现时相同或不同,是不适当地不利地影响聚合物的非线性光学性质的任何取代基; x和y相同或不同,为0或1〜10的整数; 选择T和Z具有聚酯,聚碳酸酯,聚酰胺,聚醚,聚氨酯,聚酰亚胺,环氧树脂的一般结构。
Abstract:
An improved flexible composite of manufacture especially suitable for use as a ballistic resistant body armor, said improved penetration resistant composite of the type comprising at least two penetration resistant layers, each layer comprising a flexible fibrous substrate comprising a fibrous network having a plurality of penetration resistant elements on a surface thereof, wherein at least one of the inner layers further comprising a fibrous element comprising fibrous network positioned between said substrate and said penetration resistance element.
Abstract:
A device having a thin ceramic layer (204) therein, is made by preparing a mixture of ceramic particles, a binder, and a plasticizer, and forming the mixture into a ceramic layer (204). A second layer (206) is placed adjacent to the ceramic layer (204) to form a composite layered structure. The thickness of the composite layered structure is reduced, preferably by rolling, until the ceramic layer portion (204) of the composite layered structure has a preselected small thickness. If desired, the thickness of the ceramic layer (204) can be reduced to an arbitrarily small value by stacking the reduced composite layered structures (or one of the layered structures with another structure) and repeating the reducing operation on the stack. The ceramic layer (204) having the preselected thickness is assembled into a device (214). Devices that can be prepared by this approach, for example, multilayer capacitors, solid oxide fuel cells, and solid-electrolyte electrochemical storage cells.
Abstract:
A rapidly solidified amorphous metallic alloy is composed of iron, boron, silicon and carbon. The alloy exhibits in combination high saturation induction, high Curie temperature, high crystallization temperature, low core loss and low exciting power at line frequencies and is particularly suited for use in cores of transformers for an electrical power distribution network.
Abstract:
An accelerometer (2) formed from a semiconducting substrate (32) and first (31) and second (33) active layers coupled to the opposite surfaces (27, 29) of the substrate (32). The substrate (32) has a frame (4, 6, 8) and a proof mass (18) suspended from the frame (8) by one or more flexures (14, 16) for rotation about an input axis (20) in response to an applied force. The active layers (31, 33) each include a vibratory force transducer (22, 24) mechanically coupled to the proof mass (18) for detecting a force applied to the proof mass (18). With this configuration, the transducers (22, 24) are located on either side of the substrate (32), which improves the differential design symmetry of the force detecting apparatus. This reduces the common mode non-linear response characteristics of the accelerometer (2), particularly in high dynamics applications, where high performance is required.
Abstract:
The invention provides a process for production of 1,1,1,2,3,3,3-heptafluoropropane, HFC-227ea. In particular, the invention provides an inexpensive process for producing HFC-227ea in good yield by reacting 1,1,1,3,3,3-hexafluoropropane, HFC-236fa, with elemental fluorine in an inert gas.
Abstract:
The present invention relates to a process for recovering sulfur hexafluoride ("SF6"). More specifically, the invention provides a pressure swing adsorption - desorption process for recovering SF6 from a gas stream using zeolites, activated carbons, or silicalites to adsorb the SF6.