35results about How to "Increased mechanical engagement" patented technology

The invention discloses a preparation method of a titanium and titanium alloy surface black protective film for surgical implantation, comprising the following steps: step 1: carrying out micro-arc oxidation coloring processing on titanium and titanium alloy surface to be processed, in the process, firstly, preparing a micro-arc oxidation electrolysing solution, and then carrying out the micro-arc oxidation coloring processing; and step 2: carrying out subsequent processing on the micro-arc oxidation film, wherein the subsequent processing comprises the following steps: firstly, preparing a mixed solution for hydro-thermal processing, completely dipping the titanium and titanium alloy after micro-arc oxidation shading processing in the mixed solution, carrying out the hydro-thermal processing on the surface by adopting a hydro-thermal method, drying the titanium and titanium alloy under the condition of low temperature when the hydro-thermal processing is completed, and generating a layer of pure black micro-arc oxidation film with uniform and plump surface on the titanium and titanium alloy surface. The invention has simple and convenient operation, economy, high production efficiency, and high bonding strength between a generated ceramic film, i.e. the micro-arc oxidation film and a substrate, and the invention can effectively overcome various defects and deficiencies which exist in the prior coating processing techniques.

A pot support adapted to be secured on the ground for receiving and maintaining a pot therein in a desired position in respect with the ground is presented. The pot support comprising including a ground-securing member adapted to secure the pot support to the ground. A kit thereof is also presented.

The invention discloses a method of grafting hexamine on a carbon fiber surface in supercritical methanol and relates to a carbon fiber surface modification method. The method aims at solving the problems that few groups are grafted onto a carbon fiber and distributed on the carbon fiber nonuniformly, and the bonding strength of the modified carbon fiber with resin is low for the existing carbon fiber surface modification method. The method of grafting hexamine on the carbon fiber surface in supercritical methanol comprises the steps: I, cleaning, II, oxidizing, III, acylating chlorination, IV, alcoholysis, and V, grafting of hexamine in supercritical methanol to form the carbon fiber with hexamine grafted on the surface. Interfacial shear strength of the carbon fiber with hexamine grafted on the surface is improved to 106.1MPa from 64.9MPa of a precursor fiber by 63.5%.The method of grafting hexamine on the carbon fiber surface in supercritical methanol can be obtained.

The invention discloses a high-conductivity dispersed copper-based high-temperature self-lubricating composite. The high-conductivity dispersed copper-based high-temperature self-lubricating composite comprises oxygen-free copper powder and the following components of, by mass, 30%-50% of aluminum oxide dispersion copper powder, 0-2% of molybdenum disulfide powder and 6%-8% of graphite. When the temperature of the friction surface increases, the friction coefficient cannot decrease obviously, the recovery capability of reusing after cooling is high, the friction coefficient in each temperature range is kept between 0.130 and 0.140, a stable frictional characteristic is achieved, the characteristics of a low expansion coefficient, a high conductivity and heat conducting rate, high strength and toughness and the like are achieved, the anti-declining property is high, high-temperature lubrication, wear resistance and electrical conductivity can be achieved simultaneously, and the low friction coefficient and the low wearing capacity under the working condition of high speed sliding can be ensured by the self-lubricating composite, the self-lubricating composite is suitable for the fields of aviation, spaceflight, high speed railways, radar communication and the like, and particularly suitable for the fields of high speed railway pantograph pans, radar electric brushes, high speed printing elements and the like.

The invention discloses a supercritical fluid technology-based carbon fiber surface grafting method, and relates to a carbon fiber surface modifying method. The purpose of the invention is to solve the problems of few reaction sites of grafted micro-molecular substances, easy cross-linking of graft copolymers, and low bonding strength between modified carbon fibers and resin of present carbon fiber surface modifying methods. The method disclosed in the invention comprises the following steps: removing an epoxy coating layer on the surface of the carbon fibers; 2, oxidizing the carbon fibers; 3, carrying out acylchlorination on the carbon fibers; and 4, grafting the surface of the carbon fibers with melamine. The surface of the carbon fibers is grafted with melamine, and the quantity of reaction sites is large, so convenience is provided for a next step grafting reaction. The molecular weight of melamine is small, and melamine and polymers are difficult to cross-link, so melamine has very good dispersion, and undergoes a grafting reaction with good homogeneity on the surface of the carbon fibers in order to facilitate improvement of the interface performances of a composite material. The method is used for surface modification of the carbon fibers.

The invention discloses a composite internal curing shrinkage-reducing and anti-cracking agent for concrete and a production method thereof, belonging to a concrete additive. In parts by weight, including: modified expansion agent, acrylic modified polypropylene fiber, graphene oxide and polycarboxylate water reducing agent. In the present invention, by using graphene oxide as the adsorption point, acrylic modified polypropylene fiber is adsorbed to form a three-dimensional network dendritic capillary structure, and numerous uniformly distributed micro-reservoirs are formed inside the concrete, so as to promote the cementation material to the greatest extent. hydration reaction, and significantly improve the deformation properties, crack resistance and durability of concrete.

The invention belongs to the technical field of wood-based panel manufacturing, in particular to a surface control process for PB cold-laminated panels, which solves the problem that in the prior art, the veneering treatment of PB panels has high requirements on process parameters, and the veneered PB panels produced are subject to the level of production technology. Restriction, problems such as glue opening, blistering, and low bonding strength are prone to occur. The surface control process of the PB cold veneer, the PB cold veneer, in the order from top to bottom, is composed of composite veneer-plain board-composite veneer The surfaces are connected by the adhesive I, and finally cold-pressed and formed after post-processing. In the present invention, the composite veneer, the plain board and the adhesive I are prepared, and the composite veneer-plain board-composite veneer is connected by the adhesive I, and finally the PB cold veneer is prepared by cold pressing; the preparation method of the invention is simple, and cold pressing is adopted. The molding and cold-pressing solidification process has low requirements on process parameters, simple production operation, low preparation cost, and is suitable for industrial production.

The invention discloses a comprehensive electrical loss curing method of a carbon fiber reinforced resin-based composite material. According to the method, paired metal sheets are respectively spreadalong the fiber direction and the direction vertical to fibers in each layer of the carbon fiber reinforced resin-based composite material; independently applying an alternating electric field havingcontinuous changing waveform, frequency and current density among each pair of sheets, and vertical to the fiber direction; vertical to the fiber direction, carbon fibers are the same as a plane-parallel capacitor, polarization loss, leakage conductance loss, free loss and other dielectric loss are generated from a fiber clearance matrix; along the fiber direction, conductance loss is generated bythe fibers under the current effect, and the material is integrally heated and finally cured into a composite material component under the comprehensive effect of lost heat with various modes. The method can realize high efficiency and low energy consumption curing of a large-sized large-thickness carbon fiber composite material component, improving the temperature uniformity of the component ineach direction in the curing process and improving the curing quality of large-sized components.

A molding apparatus includes two mold tools that define and bound a mold cavity therebetween, for three-dimensionally press-molding a trim component. To minimize or avoid shrinkage or pull-back recession of the edge of the trim component during the molding process, at least one of the mold tools, on its molding surface bounding an end portion of the mold cavity, includes at least one grip-enhancing structure that provides increased grip on an edge portion of the trim component. The grip-enhancing structure may be or include a rough surface, a geometric configured surface, a geometric gripping edge, a surface coating, or mechanical engagement members. The grip-enhancing structure provides increased grip on the edge portion of the trim component by narrowing the mold cavity space, by increasing the surface friction or adhesion, and / or by mechanically engaging the material of the trim component. Thereby, the edge of the trim component is held in place while the three-dimensional molding proceeds and until the molded contour of the component is fixed.