36results about How to "Consistent coefficient of thermal expansion" patented technology

The invention provides a curved mirror reflector (2), which comprises a flat glass structure (6), a middle bonding layer (7) and a flat glass mirror (8), wherein the flat glass structure (6) and the flat glass mirror (8) are processed by non-edging and/or non-tempered common glass; the middle bonding layer (7) is located between the flat glass structure (6) and the flat glass mirror (8), and is bent and deformed under support of a mould through a mechanical manner, and the bent and deformed flat glass structure (6), the middle bonding layer (7) and the flat glass mirror (8) are solidified and bonded to a composite curved surface structure through a heating and/or normal-temperature solidification manner. The curved mirror reflector (2), provided by the invention, can be widely applied in all kinds of fields of solar thermal collection and focus and solar thermal power generation.

The invention discloses crystal silicon solar cell aluminum paste with high conductivity. The crystal silicon solar cell aluminum paste comprises the following formula components in percentage by weight: 65%-78% of aluminum powder, 1%-5% of lead-free glass powder, 15%-30% of an inorganic carrier, 0.5%-3% of a warp-resistant additive and 0.1%-3% of an assistant, wherein the oxygen content of the aluminum powder is less than 0.4% in percentage by weight. After the solar cell aluminum paste prepared from the formula components is subjected to silk-screen printing and high-temperature sintering, the open-circuit voltage can be improved; and the photoelectric conversion efficiency of a cell slice is improved. Meanwhile, the solar cell slice is good in appearance; and an aluminum film is smooth, does not generate an alumina bead or an aluminum bract, is small in warping degree and good in boiling resistance, and completely conforms to the requirements on the crystal silicon solar cell aluminum paste on the market.

The invention relates to a repairing process and a repairing tool for excircle crack conquassation of tires and carrier rollers of a rotary kiln. According to the invention, a flux-cored wire, of which the tensile strength is 585, is used for padding and isolating; padding, isolating and cladding are conducted twice on a circle of a plano-concave groove, wherein the current is 190, the voltage is 22, and the welding seam is required to be 10 mm higher than the upper part of a groove base metal; then a solid core wire, of which the yield strength is 580, is used for replacing the flux-cored wire to caulk and restore the size, wherein the integral appearance of a concave welding bead is required to be kept during the build-up welding process; segmental welding is adopted on the basis to restore the size; finally, a temper bead is additionally capped; when the size is restored through build-up welding, the internal stress can be lowered to the minimum value, and build-up welding is fulfilled; and on-site heat treatment is carried out immediately. Therefore, the repairing process and the repairing tool have the advantages that the integration of welding material and base metal can be better; the distribution of metallographic structures and hardness is uniform; impact of vertical welding is avoided; the construction is fast; the welding strength is high; the ductility and the toughness are good; wear-resistant, corrosion-resistant, heat-proof, shock-proof and crack-resistant capabilities are excellent; stop time in cement enterprises is reduced; and the production efficiency is improved.

The invention belongs to the technical field of ceramic joining and discloses a method for joining a nano-impregnated transient eutectic phase with SiC ceramic. The method comprises the following steps: taking mixed powder A of SiC powder and Al2O3-MxOy as a joining material, wherein MxOy is Ho2O3 or CeO2; adding a solvent and a ball milling medium into the mixed powder A for mixing and drying, then spreading powder obtained by granulating obtained mixed powder B between two pieces of polished SiC to form a sandwich structure; then carrying out isostatic cool pressing treatment, and pressurizing to 0.01 to 0.1MPa in a vacuum or atmosphere protection; raising the temperature to 600 to 1000 DEG C and insulating I; raising the temperature again to 1450 to 1600 DEG C and insulating II at the pressure of 200 to 500 MPa, and joining to obtain the nano-impregnated transient eutectic phase joined SiC ceramic. The method disclosed by the invention realizes low-temperature and low-pressure joining of the SiC ceramic, and the leak rate of the joining part reaches 0 to 1*10<-8> Pa.L/s.

The invention relates to a method for growing a crystal optical fiber core in a crystal cladding layer. The method comprises the following steps: (1) obtaining a microporous crystal with a length of 40 to 160 mm by adopting a microporous crystal growing method, wherein the inner diameter of the microporous crystal is less than or equal to 1 mm, or obtaining the microporous crystal provided with micropores by perforating the center of a crystal rod with a machining method; (2) mounting the microporous crystal obtained in the step (1) on a micro pull-down furnace seed rod; (3) putting 1 to 2 g of a raw material into a crucible; (4) heating and melting the raw material in the crucible; (5) lifting up the seed rod to enable the microporous crystal to be in contact with a small hole in the bottom of the crucible, and allowing a melt in the crucible to enter the holes of the microporous crystal under the action of the gravity and the capillary action; (6) controlling the temperature of a post-heater to be reduced to room temperature at a cooling rate of 100 to 300 DEG C/h, so as to complete the whole crystal growing process. Compared with the prior art, the method has the advantages thata crystal core and the crystal cladding layer are seamlessly connected to obtain uniform refractive index distribution, so that a high-power crystal optical fiber laser device can be obtained.

The invention discloses a high radiant ceramic coating for a heating furnace tube as well as a preparation method and a using method thereof. The high radiant ceramic coating for the heating furnace tube comprises a component A and a component B, wherein the component A is a metallic oxide mixture which is 30-35% of the total amount and the component B is a temperature resistant bonder which is 65-70% of the total amount. The high radiant ceramic coating provided by the invention has the functions of anti-high temperature oxidation and anticorrosion, prolongs the service life of the furnace tube, increases the heat transfer on the surface of the furnace tube, increases the heat exchange efficiency, reduces the fuel consumption of the heating furnace and reaches the energy saving purpose; under the condition of not changing the device structure, the high radiant ceramic coating reinforces the radiative transfer, is few in investment, rapid in effect, simple in construction and good for industrial popularization.

The invention discloses a method for integrally forming C sandwich panel antenna housing. The method comprises the following steps: (1), preparing prepregs; (2), carrying out die pretreatment; (3), laying and pasting an outer skin; (4), laying and pasting honeycombs and a middle skin; (5), laying and pasting honeycombs and an inner skin; (6), curing; (7), demolding; and (8), machining and formingholes. According to the method for integrally forming the C sandwich panel antenna housing is simple; mixed materials with glass fibers or quartz fibers and epoxy resin or cyanic acid resin or bismaleimide resin are used as prepregs; aramid paper honeycombs and same-system adhesive films are used as main raw materials; a pre-compaction step is added after the skins are laid and pasted; bubbles among the prepregs are completely eliminated; meanwhile, resin fusion is more sufficient; curing is carried out after three layers of skins and two layers of honeycombs are laid and pasted; the thermal expansion coefficients of the prepregs are consistent; the stress in the curing process is small; the planeness of the panel antenna housing can be guaranteed; the method has few operation steps; the usage of autoclaves can be reduced; the energy consumption is reduced; and the production cost is reduced.

Provided is a packaging method for a while-drilling acoustic wave transducer. The while-drilling acoustic wave transducer comprises a rubber layer, an outer shell, a piezoelectric ceramic crystal and an electric connector, wherein the piezoelectric ceramic crystal and the electric connector are packaged in the outer shell. The packaging method comprises the following steps that (1), an electrode of the piezoelectric ceramic crystal and the electric connector are connected with each other through a lead and placed in a mold; (2), packaging materials are prepared, and the packaging materials are identical with the piezoelectric ceramic crystal in thermal expansion coefficient; (3), the mold is filled with the packaging materials which are heated to the melting point, the outer shell is formed after the packaging materials are cooled and solidified, and the packaging materials, the piezoelectric ceramic crystal and the electric connector are made to be packaged into a whole; and (4), the rubber layer is laid on the outer side of the outer shell. By means of the packaging method, it is guaranteed that the piezoelectric ceramic crystal in the transducer cannot be damaged in the packaging process, the rubber layer is laid on the outer side of the outer shell of the while-drilling acoustic wave transducer so as to resist vibration, and installation of the transducer is facilitated.

The invention relates to the field of optical communication, in particular to a mounting and welding method for controlling tracking errors of coaxial optical devices. The mounting and welding methodfor controlling the tracking errors of the coaxial optical devices comprises the following steps of (1), mounting the optical devices; (2), mounting an isolator; (3), welding a pipe body; and (4), welding a plug pin. On the premise of ensuring correct mounting operation, a laser coupling welding process of the pipe body and the plug pin is adjusted, spot welding is adopted, each group of three welding spots are respectively welded by three welding guns, energy is uniformly distributed, stress pulling is consistent so that light path deviation cannot be caused, the welding spots welded by the plug pin are distributed in a plum blossom shape, welding symmetry can be increased, and sufficient stress release is guaranteed, so that performance of the devices is greatly improved, the power variation range along with the external environment temperature is reduced, the high-low temperature power errors of the coaxial devices are better controlled within the standard range, the rejection rateis reduced, the cost is low, and thus the mounting and welding method is suitable for batch production of coaxial products.

The invention discloses a solid oxide fuel cell stack and a preparation method thereof, and relates to the technical field of fuel cells. An electrolyte membrane layer and a ceramic connector membrane layer are formed by coating a porous ceramic framework, then back-to-back hot-pressing stacking is performed, and alternate impregnation is performed to obtain a negative electrode and a positive electrode, so that each repetitive unit of the cell stack comprises a negative electrode layer, an electrolyte membrane layer and a positive electrode layer which are sequentially arranged; and the anode layer in each repeating unit is connected with the cathode layer in the adjacent repeating unit through the ceramic connector film layer to form a cell stack structure in which the anode layers and the cathode layers are alternately stacked. The structure has abundant three-phase interfaces, the electrochemical performance of the cell is outstanding, the electrolyte and the connector are both compact ceramic films, the ohmic impedance is small, and the power output of the cell stack is high; and the ceramic connector with the thermal expansion coefficient consistent with that of the porous ceramic framework is adopted, the thermal stress is small, the thermal cycle performance of the cell stack is good, the oxidation corrosion problem does not exist, and the long-term stability of the cell stack can be improved.

The invention discloses a movable spring assembly of a relay and an electromagnetic relay, the movable spring assembly comprises at least two movable spring sheets, a movable spring leading-out sheet and a movable contact, the at least two movable spring sheets are stacked together, one end of each movable spring sheet is fixedly connected with the movable spring leading-out sheet, and the other end of each movable spring sheet is fixedly connected with the movable contact. The other ends of the at least two movable reeds are fixedly connected with the movable contact respectively; and the shapes and the unfolding sizes of the at least two movable reeds are consistent or basically consistent. According to the invention, the at least two movable reeds can share one blanking die during punch forming, the thermal expansion coefficients of the movable reeds are consistent, and the mechanical stress and thermal stress are small, so that the action and release parameters of the relay are stable.

The present invention discloses a steam sampling pipe device which is characterized in that a columnar hole and a circular boss which are communicated with each other are formed in the side wall of an alloy steel pipeline from outside to inside, and columnar hole internal threads are formed in the inner wall of the columnar hole; the alloy steel steam sampling pipe comprises a steam sampling pipe connecting pipe, an upper large-diameter cylindrical body which is positioned at the upper part of a cylindrical hole in the side wall of the alloy steel pipeline, is welded and connected by adopting a same steel fillet weld and is provided with a single V-shaped groove at the bottom, a middle small-diameter cylindrical body which is positioned in the cylindrical hole in the side wall of the alloy steel pipeline and is provided with an external thread, a cone-shaped body having the lower part being in contact with the circular boss of the alloy steel pipeline in an abutting manner, and a cylindrical body which is provided with a steam sampling hole and extends into the alloy steel pipeline; and the steam sampling pipe connecting pipe is connected with a steam sampling pipe system. The device is high in rigidity and not prone to vibration, and influences of weak interfaces of dissimilar steel weld joints and axial pressure of threads in the middle of the alloy steel steam sampling pipe on fillet weld joints of the alloy steel pipeline and the alloy steel steam sampling pipe are eliminated.