3results about How to "Relief Concentration" patented technology

The present application relates to a kind of lightweight biomimetic discontinuous fiber spiral composite protective structure, belong to lightweight protective structure design technical field.The lightweight high-strength high-toughness biomimetic discontinuous fiber spiral composite protective structure of the present application is stacked by unit intermittent fiber fabric according to different arrangement angles and arrangement ways, under the condition of local stress concentration in relaxation layer, shear stress is distributed to the intermittent connecting part in each layer, the concentration of interlaminar shear stress is relieved, using the interlaminar shear stress distribution mechanism of the composite material makes crack frequently deflect when it bears load, can delay material failure and destruction, greatly improve the bearing and energy absorption capacity of the composite protective structure.

The application provides an enhanced HEMT power tube device and a preparation method thereof, wherein a four-layer composite structure of a GaN protection-charge regulation layer, an AlN first etching stop layer, a P-type GaN main body layer and a P-type AlGaN top layer barrier layer is sequentially arranged from bottom to top, the P-type AlGaN top layer barrier layer is used to increase the Schottky barrier height, inhibit the positive forward current of the gate and improve the gate voltage resistance; the P-type GaN main body layer is used to realize the enhanced characteristics of the device by depleting the two-dimensional electron gas below, and the threshold voltage is controlled; the Al-F strong bond energy characteristics are used in the AlN first etching stop layer to realize etching self-stop, and the etching damage to the AlGaN barrier layer is reduced by the joint action of the GaN protection-charge regulation layer; the GaN protection-charge regulation layer is used to reduce the interface state density, reduce the dynamic on-resistance and reduce the occurrence of current collapse, and meanwhile, the gate edge electric field distribution is smoothed, and the breakdown voltage is improved. In addition, a first passivation layer, a source field plate, a second passivation layer and a floating field plate can be further formed, and the GaN protection-charge regulation layer is used to jointly act to relieve the electric field concentration, improve the voltage resistance and reliability of the gate.

The invention relates to a preparation method of a carbon fiber reinforced aluminum / glass bead composite metal material. According to the method, nickel-plated carbon fibers are added into aluminum / glass bead powder turbid liquid in a stirring state, and then hot pressed sintering is performed in a graphite mold, so that nickel and aluminum on the surfaces of the nickel-plated carbon fibers tend to form a continuous and uniform Al3Ni thin-film-shaped interface layer at an interface, generation of an Al4C3 brittle phase is hindered, and the performance of the nickel-plated carbon fibers is improved. And the transition of the load from the matrix to the carbon fiber is realized. The proportion of the nickel-plated carbon fibers, the aluminum powder and the glass beads can be properly adjusted according to different purposes, and the material obtained after hot pressing sintering is uniform in component distribution and excellent in performance.