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1148 results about "Embrittlement" patented technology

Embrittlement is a loss of ductility of a material, making it brittle. Embrittlement is used for any phenomena where a hostile environment compromises a stressed material's mechanical performance. Various materials have different mechanisms of embrittlement. Due to these various mechanisms, embrittlement manifests in a variety of ways, from slow crack growth to a reduction of tensile ductility and toughness. Often, cyclical stresses or environments lead to embrittlement.

Centrifugal casting high-speed steel composite roll and manufacture method thereof

The invention relates to a centrifugal casting high-speed steel composite roll and a manufacture method thereof and belongs to the field of casting. The composite roll is composed of outer layer high-speed steel, middle layer graphitic steel and core high-strength nodular cast iron by centrifugal compounding. The centrifugal casting high-speed steel composite roll is based on the conventional high-carbon high-vanadium high-speed steel roll, the content of vanadium is appropriately reduced, niobium is added at the same time, and the Nb / V is controlled to be 0.3 to 0.5 so that Nb and V form complex carbide (V, Nb) C so as to avoid forming segregation under the action of centrifugal force. A roll core of the high-speed steel composite roll adopts high-strength nodular cast iron, and a multivariate graphite steel middle layer is poured between an outer layer and the roll core for preventing interfusing elements of Cr, B, and the like which cause embrittlement when the nodular cast iron is poured to be fused with the outer layer high-speed steel. Microalloying processing for refining the organization is carried out on a roll surface high-speed steel material and the middle layer graphitic steel so as to achieve the purpose of improving the thermal cracking capacity of the roll material. The centrifugal casting high-speed steel composite roll has high overall performance, long service life and good economic benefits.
Owner:BEIJING UNIV OF TECH

Method and device for cleaning high-voltage carrying installation component parts

InactiveUS6863594B2Without endangering safetyProtected installationBlast gunsPipeline systemsEngineeringCleaning methods
A cleaning method and a corresponding cleaning device offer adequate protection to individuals, devices and installations, for cleaning component parts of installations that carry an electrical high-voltage and which are not disconnected during cleaning. Towards this end, the component parts to be cleaned are subjected to the action of a two-phase particle stream (PS) consisting of a compressed gas (DGA) serving as a carrier medium and of carbon dioxide ice particles (TP) carried therein. Possible superficial accumulations of dirt are removed from the component parts by way of low-temperature embrittlement and by the kinetic energy of the impacting carbon dioxide particles. The carbon dioxide ice particles themselves sublimate without leaving residues. A sufficiently safe distance of cleaning personnel from the high-voltage carrying insulation component parts is ensured by the provision of an electrically insulating distance mechanism (L, SFR) that is provided approximately in the form of a lance (L) or of a stream guided tube (SFR). A further increase in protection is offered by monitoring the quantity of moisture of compressed gas and / or ambient air, whereby the cleaning device is immediately shut off when predetermined limiting values are exceeded.
Owner:PREISING PAUL ERIC

Preparation method of continuous filament of asphalt-based carbon fiber

The invention discloses a preparation method of a continuous filament of an asphalt-based carbon fiber, and belongs to the field of carbon fiber production. The preparation method solves the problems that the existing spinning speed is lower, the fiber bundle damage is large, the infusibility efficiency is low, and doubling and embrittlement are easy. The preparation method comprises the specific process steps that a, spinning asphalt is extruded into fines by spinning position fusion, humidified, oiled and bundled to form a protogenic asphalt fiber bundle; b, double roller stranding and tensioning are conducted; c, the asphalt fiber bundle is wound on a spinning roller sleeve; d, an asphalt fiber reel is immersed in an oxidability liquid phase, and a liquid-phase oxidized fiber bundle reel is obtained; e, the reel is immersed in a high-temperature-resistant oil solution; the filament is unreeled and rollers are removed at a low speed; the oxidized fiber bundle continuously enters a continuous infusible furnace and a continuous low-temperature pre-carbonization furnace to form a pre-carbonization fiber bundle reel; and f, drawing heat treatment is conducted through a continuous carbon-fiber high-temperature carbonization furnace and a graphitization furnace, and then the continuous filament of the asphalt-based carbon fiber is obtained.
Owner:SICHUAN CHUANGYUE CARBON MATERIAL

Method for preparing polyacrylate/nano-SiO2 compound coating agent by using reactive emulsifier

The invention relates to a method for preparing polyacrylate/nano-SiO2 compound coating agent which is suitable for bottom layer coating in clothing leathers and instep leathers, by using a reactive emulsifier. The polyacrylate has excellent optical stability, chemical resistance and favorable adhesive property and is widely used as an adhesive, a coating film-forming agent, a functional film, and a medical polymer and in the fields of water treatment and the like, but polyacrylate emulsion has the defects of embrittlement at low temperature, stickiness and strength loss at high temperature, easy after tack and the like, which restrict the application range and the use value of the polyacrylate emulsion. In the invention, the polyacrylate/nano-SiO2 compound coating agent is prepared by substituting conventional emulsifier with reactive emulsifier by utilizing the nanometer effect of an inorganic nanometer material and synchronously adopting a conventional emulsion polymerization method and a sol-gel method. The compound coating agent prepared by the invention has fine granules, excellent adhesive force, good filling capacity, strong water resistance and flexible and transparent formed film, and meanwhile, the damages to the human body and the environment, which are caused by the use of large amount of emulsifiers, are reduced.
Owner:SHAANXI UNIV OF SCI & TECH

Bubble-free yellowing resistant polyurethane electronic potting adhesive composition and preparation method thereof

The invention relates to a bubble-free yellowing resistant polyurethane electronic potting adhesive composition and a preparation method thereof. The raw material of the composition is a double-component system which mainly comprises a polyatomic alcohol compound, a polyisocyanate compound and other accessory agents with favorable weather resistance; and the proportion of the mole equivalent weight of an isocyanate group to the mole equivalent weight of an active hydrogen compound component in the system is 1.0:0.8-1.0:1.5. The composition disclosed by the invention solves the problems of yellowing, embrittlement, hardening, breakage, and the like which are generated after long-term use, of the traditional transparent potting adhesive; the potting adhesive composition is produced by adopting the raw materials with favorable weather resistance and a special synthesis process; the composition also has excellent weather resistance, and the product can not generate the adverse phenomena after long-term use; and the composition can be applied to a flexible printed circuit board LED soft strip light bar products with extremely high requirements on bending performance and yellowing resistant performance and can be also greatly applied to the industries of optical devices, photoelectric and solar cell panels, and the like in quantity.
Owner:厦门誉匠复合材料有限公司

Method for manufacturing soi substrate

It is an object to provide a method for, after a semiconductor film is separated, reprocessing a separated bond substrate into a reprocessed bond substrate which can be used for manufacturing an SOI substrate. The method for, after a semiconductor film is separated, reprocessing a separated bond substrate into a reprocessed bond substrate which can be used for manufacturing an SOI substrate includes the steps of forming an insulating film over a bond substrate; adding ions from a surface of the bond substrate to form an embrittlement layer; bonding the bond substrate to a glass substrate with the insulating film interposed therebetween; separating, at the embrittlement layer, the bond substrate into a semiconductor film which is bonded to the glass substrate with the insulating film interposed therebetween and a separated bond substrate; performing first wet etching using a solution containing hydrofluoric acid as an etchant on the separated bond substrate; performing second wet etching using an organic alkaline aqueous solution as an etchant on the separated bond substrate; performing thermal oxidation treatment on the separated bond substrate in an oxidizing atmosphere to which a gas containing halogen is added to form an oxide film on a surface of the separated bond substrate; performing third wet etching using a solution containing hydrofluoric acid as an etchant on the oxide film; and forming a reprocessed bond substrate by performing polishing on the separated bond substrate.
Owner:SEMICON ENERGY LAB CO LTD
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