32results about How to "Excellent and stable mechanical properties" patented technology

The invention discloses high-performance rubber for a generator shock pad and a preparation process thereof. Raw materials of the rubber comprise: natural rubber, DBD (Dibromodulcitol), 100-mesh zinc oxide, stearic acid, CTP (Cytidine Triphosphate), spraying carbon black, DCP (Dicalcium Phosphate), BMI (Bismaleimide Resin), TMTD (Thiram), CZ (Citrazinic Acid), m-phenylenediamine and bisphenol A type epoxy resin; and the preparation process comprises: premixing, mixing and vulcanizing. A rubber material is fully activated by mixing to improve the heat resistance, aging resistance and deformation resistance of the rubber material, the m-phenylenediamine and the BMI are pre-mixed before the vulcanizing procedure to improve the toughness of the BMI, the bisphenol A type epoxy resin is added with the m-phenylenediamine, the three components are compatible and perforative to improve the shearing strength and the aging resistance of the rubber, the CZ and the TMTD are added to further improve the curing speed and the scorch resistance, and the finally obtained rubber has good breaking strength and breaking elongation, proper hardness, excellent high temperature resistance and good damping effect.

The invention relates to a nitrogen-containing germanium carbon alloy membrane material and a preparation method thereof, and belongs to the technical field of membrane materials. The alloy membrane material consists of the following components in percentage by atom: 81 percent of germanium, 11 to 9 percent of carbon and 8 to 10 percent of nitrogen. A nitrogen-containing germanium carbon alloy membrane is prepared by a radio frequency magnetic control sputtering method, namely a Ge target is subjected to pre-sputtering through Ar by using monocrystalline germanium as a target and N2, CH4 and the Ar as discharging gases to remove residual pollutants; and the discharging gases are mixed to enter a vacuum reaction chamber, and are sputtered to form the membrane by controlling pressure intensity, the temperature of a substrate and radio frequency power. The nitrogen-containing germanium carbon alloy membrane has a compact structure and a smooth surface, and has the advantages of low stress, simplicity in plating thickness, infrared transparence of a nitrogen-free germanium carbon alloy membrane; and the hardness and the optical band gap of the nitrogen-containing germanium carbon alloy membrane are over 50 percent and 12 percent higher than those of the nitrogen-free germanium carbon alloy membrane, so the nitrogen-containing germanium carbon alloy membrane material is more suitable to be used as an infrared anti-reflection protective membrane material under the condition of high-speed flight service.

The invention discloses a nickel-based electrode for overhead welding with 9% Ni steel, which is composed of a welding core and a coating, the coating is coated on the outer wall of the welding core, and the coating accounts for 0.3 to 0.5 of the total weight coefficient of the welding rod; The welding core adopts nickel-chromium-iron welding core; the composition of the coating adopts high alkalinity CaCO 3 ‑MgCO 3 ‑CaF 2 Low hydrogen residue system. The invention has excellent weldability in all positions, especially in the overhead welding position, and extremely low porosity of the overhead welding film. The welding rod of the invention has excellent welding performance for overhead welding, stable arc, excellent slag removal and excellent weld formation; the welding rod has extremely low welding porosity for overhead welding, and the pass rate of high-definition radiographic flaw detection TOFD filming for overhead welding can reach more than 99.5%.

The invention discloses a flux-cored wire for electrogas welding, which comprises a steel strip and welding flux wrapped in the steel strip. The weight coefficient of the welding flux in the overall weight of the wire ranges from 0.2 to 0.3. By weight percentage, the steel strip comprises 0.010-0.055% of C (carbon), 0.01-0.03% of Si (silicon), 0.10-0.30% of Mn (manganese), 0.005-0.060% of Al (aluminum), 0.007-0.012% of P (phosphorus), 0.007-0.012% of S (sulfur) and the balance Fe (ferrum). By the overall weight of the wire, the welding flux comprises 0.2-2.0% of fluoride, 0.2-1.0% of oxide, 1.0-3.0% of Mn, 0.2-1.0% of Si, 0.4-1.2% of Ni (nickel), 0.1-1.0% of Mg (magnesium), 0.002-0.16% of Ti (titanium), 0.002-0.010% of B (boron) and the balance Fe. The flux-cored wire matched with electrogas welding is used for welding, so that welding efficiency is greatly improved, and excellent and stable mechanical performance is also obtained.

The invention relates to a compound solid propellant with a low burning rate, high energy and high mechanical property. The compound solid propellant is prepared from components in parts by weight asfollows: 6-7 parts of an adhesive, 17-19 parts of a plasticizer, 10-15 parts of an oxidizing agent, 42-47 parts of energy-containing explosive, 15-18 parts of metal fuel, 0.15-0.25 parts of a curing agent, 0.05 parts of a curing catalyst, 0.3 parts of a stabilizing agent and 0.2 parts of a bonding agent. The minimum burning rate under the pressure of 6.686 MPa can reach 7 mm / s, the standard specific impulse is stably larger than 255 s according to actual testing, the technical problems that the burning rate of a high-energy propellant is further reduced and the energy of the propellant is substantially reduced are solved, and the technical requirements of existing propellants for weapon models for high energy, lower burning rate and high mechanical property are met.

The invention relates to the technical field of aluminum alloys, in particular to a production method for an Al-Zn-Mg-Cu series aluminum alloy panel for safety shoe box toes. According to the production method for the Al-Zn-Mg-Cu series aluminum alloy panel for the safety shoe box toes, chemical components including Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti and the balance Al are adopted for casting an aluminum alloy casting ingot, the aluminum alloy casting ingot is subjected to the steps of preheating, hot rolling, cold rolling, cleaning and three-level annealing, and the aluminum alloy panel is manufactured. The obtained product has excellent and stable mechanical performance and meanwhile has high punching performance, high electric conductivity and good surface quality, and the punching using requirement for safety shoe toepiece materials can be met.

A box-in-box structure includes thermal clay, a plate and a film. The thermal clay includes a polyarysulfone material. The thermal clay is in a form of a first box and the film which has at least one side is in a form of a second box. The second box is attached to the first box in the presence of the plate so that the first box accommodates the second box to form a box-in-box structure.

The invention discloses a low-carbon low-alloy chromium-molybdenum pressure vessel steel plate and a heat treatment method thereof. On the basis of using a simple and low-cost heat treatment process such as normalizing + tempering, the thickness and composition of the steel plate are dynamically controlled to finally obtain The high-quality steel plate can not only meet the performance requirements, but also simplify the production process and reduce the production cost. The invention is based on a simple heat treatment process: normalizing + tempering, and provides a dynamic control idea to control the dynamic structure through dynamic components and obtain good performance. The invention mainly relates to steel plates for low-carbon and low-alloy chromium-molybdenum pressure vessels, including the dynamic structure and component-controlled heat treatment process of 15CrMoR and 14Cr1MoR steels.