448results about How to "Guaranteed dimensional stability" patented technology

The invention provides a preparation method for SiC particle reinforced aluminum-based composite material. The preparation method comprises the steps as follows: step 1, the Al-Si-Mg alloy is placed into a homemade dry pot resistance furnace, after the Al-Si-Mg alloy is completely melted, 1-17 parts of intermediate alloy Al-R by weight, which is prepared in advance, is added into the melt, wherein the intermediate alloy is prepared in advance through a surface modification technology; step 2, the melt is stirred to enable rare-earth elements to be uniformly distributed into the melt; step 3, SiC is added into the melt; step 4, the melt is poured into a metal mould for formation; step 5, quenching is performed in water with the temperature of 50-60 DEG C; step 6, quenching is performed in water with the temperature of 70-80 DEG C; step 7, air cooling is performed after aging thermal insulation is performed for 6.5-7.5 h at the temperature of 165-175 DEG C. The thermal shock performance of the aluminum-based composite material can be greatly enhanced, the dimensional stability of the material is maintained when the material is used in temperature varying places, the service life of the material is prolonged, and the material has a broad market prospect when being applied to parts requiring weight reduction and excellent abrasion resistance.

The invention discloses a method for manufacturing a copper base alloy bearing bush wear-resisting layer and relates to a bead weld method. The method for manufacturing the copper base alloy bearing bush wear-resisting layer aims at solving the problems that an existing bearing bush coating is low in combining strength, poor in coating performance and short in service life. The method includes the first step of polishing, the second step of cleaning, the third step of tin coating, the fourth step of bead weld of babbit metal on the surface of a bearing bush by a CMT welding machine and the fifth step of turning or scraping. The method is used for improving the combining strength of the wear-resisting coating and a copper base bearing bush base body, optimizing a coating organization, prolonging service life, improving the machining precision of the bearing bush and manufacturing the copper base alloy bearing bush wear-resisting layer.

The invention relates to a textile artificial blood vessel with a tube wall of a double-layer woven structure, which is composed of an outer fabric tube (1) and an inner fabric tube (2). The outer layer fabric tube (1) is coaxially nested on the inner layer fabric tube (2) and passes through the connection point in the direction of the outer wall of the inner layer fabric tube (2) and the inner layer fabric tube (2) is formed by the binding yarn of the fabric Connection (3a) or sewing connection (3b). The invention can realize the matching with the radial compliance of the host blood vessel of the human body, which is beneficial to the recovery of human body functions and facilitates the development of blood vessel transplantation operations.

The invention relates to an EVA (ethylene vinyl acetate) adhesive film for solar cells, which comprise ethylene vinyl acetate copolymer, silane coupling agent, cross-linked curing agent, cross-linking curing accelerator, thermal stabilizer, tackifier, antioxidant, ultraviolet absorbent, and hindered amine light stabilizer. Compared with the prior art and similar products, the EVA adhesive film for solar cells has great competition potential in terms of various indexes such as production formula, production process, properties and the like. A novel formula is used to prolong service life of the EVA adhesive film firstly, quick curing performance of the EVA adhesive film is improved so that production efficiency of cell package is benefited, using novel solvent to dissolve aids solves the quality problem caused by uneven mixing of the aids and particles in production, and by using the produced low-contraction-ratio EVA adhesive film, possibility of cell breakage in cell packaging can be lowered.

The invention discloses a PVC (Polyvinyl Chloride) / modified PBT (Polybutylece Terephthalate) lining material composite section and a preparation method. The PVC / modified PBT lining material composite section is characterized in that PBT is reinforced and modified, is extruded with a PVC section in a cavity together and is compositely formed to substitute a reinforced section. Compounding with the PVC section can be realized through a co-extrusion process, so that mounting steps of a metal lining are simplified, the effect is improved, and the production cost is greatly reduced. A modified material comprises the following components in parts by weight: 75-84 parts of PBT resin, 15-30 parts of glass fiber reinforcing agent, 0.1-0.3 part of lubricating agent, 1.0-1.4 parts of dispersant, 0.5-1 part of processing flow modifier (AMS), 0.5-0.7 part of anti-aging agent and 1-3 parts of low-temperature modified toughening agent.

The invention discloses a high-temperature-resistant polymer modified ceramic diaphragm and an application thereof. The high-temperature-resistant polymer modified ceramic diaphragm comprises a porousbase membrane, and at least one surface of the porous base membrane is coated with a ceramic layer; and a high-temperature-resistant polymer layer is arranged on the surface and in the interior of pores of the ceramic layer, in the interior of pores of the porous base membrane, and on the surface not coated with the ceramic layer in an in-situ polymerization manner. The high-temperature-resistantpolymer modified ceramic diaphragm has relatively high thermal stability. Through the in-situ polymerization method of pyrrole, the thiophene and the aniline monomer, a high-temperature-resistant polymer protection layer is formed on the surface and in the interior of pores of the ceramic layer, on the surface of the porous base membrane, and in the pores in an in-situ coating manner, so that theceramic layer, the polymer layer and the base membrane form an organic integrated body; therefore, the thermal size stability of the modified ceramic diaphragm is improved, and the modified ceramic diaphragm does not contract at a high temperature of 200 DEG C; and in addition, relatively high mechanical performance is still kept, positive and negative electrode contact can be effectively obstructed, and the safety performance of the battery can be guaranteed.

The invention relates to a high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy and a casting method thereof. The high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy is composed of the following components including, by weight, 9%-13% of Si, 0.2%-3% of Mg, 1%-6% of Cu, 1%-4% of Ni, 0.6%-1.0% of Fe, 0.6%-1.0% of Mn, 0.05%-1.2% of Zr, 0.05%-1.2% of V, 1%-25% of TiB2 particles, and the balance Al. After the high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy is subjected to pressure casting, the tensile strength is larger than or equal to 235 MPa at the temperature of 300 DEG C, the tensile strength is larger than or equal to 150 MPa at the temperature of 350 DEG C, and the coefficient of linear expansion within the temperature interval of 300 DEG C to 400 DEG C is (14-21)*10<-6> / DEG C; the casting property of the alloy is improved, the high-temperature (300 DEG C and 350 DEG C) tensile strength of the alloy is improved substantially, the coefficient of linear expansion of the alloy is reduced, and the application range of traditional cocrystallized Al-Si alloys is widened; and the high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy is particularly applicable to parts such as pistons of gasoline engines and diesel engines with quite high requirements for high temperature mechanical properties and for dimensional stability in the high-temperature working range.

The invention relates to an additive manufacturing method for parts with a thin wall structure based on an SLM process, and belongs to the technical field of laser advanced additive manufacturing. According to the additive manufacturing method, the problem that aluminum alloy or titanium alloy thin wall structural components printed by an existing additive manufacturing method are difficult to form, prone to deforming and prone to breaking due to large stress can be solved; the cost of additive manufacturing can be reduced, the success of additive manufacturing of the aluminum alloy thin wallstructural components is ensured, and a practical and reliable process support design method for the additive manufacturing of the aluminum alloy or titanium alloy thin wall structural components is provided.

A protection element for preventing over-current and over-voltage, comprising a base substrate (1), a pair of electrodes (4, 5) formed on the base substrate (1), and a low-melting-point metal element (2) connected between the pair of electrodes (4, 5) to cut off a current running between the electrodes (4, 5) by being fused. An insulation cover plate (13) is positioned and fixed while being kept in contact with the electrodes (4, 5) as spacer members.

The invention provides a container rear frame assembly tyre; the rear frame comprises an upper crossbeam, a lower crossbeam, a left corner column, a right corner column and a corner fittings which is formed by welding the left corner column and the right corner column together; the upper crossbeam, the lower crossbeam, the left corner column and the right corner column are connected with each other; the rear frame assembly tyre comprises an underframe which is used for arranging all parts of the rear frame which comprises two end beams and two side beams, a vertical positioning block which is arranged on the underframe and used for limiting the positions of the upper crossbeam, the lower crossbeam, the left corner column and the right corner column in the vertical direction, and a horizontal positioning block which is arranged on the underframe and used for limiting the positions of the upper crossbeam, the lower crossbeam, the left corner column and the right corner column in the horizontal direction; the rear frame assembly tyre also comprises an internal positioning device which is arranged at the middle part of the underframe; the internal positioning device comprises four groups of push-press devices which are respectively corresponding to the two end beams and the two side beams of the underframe; each group comprises at least a push-press device; each push-press device comprises a mainbody which is fixed on the underframe and a pushing rod which can extend out of the main body facing the corresponding end beam or side beam of the underframe.