33 results about "Platinum-iridium alloy" patented technology

The invention discloses a graphene cladded copper-base biological material as well as a preparation method and an application thereof. The graphene-packaged composite material contains copper and graphene, wherein the surface of copper is totally packaged with graphene. The material has a good cladding effect, the toxin introduced by copper can be eliminated, and the death of cells and the necrosis and edema of tissues are avoided. The material can be taken as an electrode, particularly a neural electrode and can be applied to an in vivo or in vitro signal recording such as the signal recording of neuronal discharging and / or local field potential change. The material and a commercial platinum-iridium alloy electrode do not generate an artifact in a nuclear magnetic resonance imaging technique, and the observation of the quality and an implementation position of a nuclear magnetic resonance is greatly assisted.

The invention relates to a membrane electrode with a bimetallic layer positive electrode for electrolysis water and a preparation method of the membrane electrode. The membrane electrode is formed by combining a cathode catalyst layer, an anode catalyst layer and a proton exchange membrane, wherein the cathode catalyst layer comprises thin-layer platinum, the anode catalyst layer comprises a bimetallic layer composed of a platinum metal thin layer and a iridium metal thin layer, the proton exchange membrane is a Nafion115 membrane, the cathode catalyst layer and the anode catalyst layer are formed by sequentially reducing and depositing metal ions on the proton exchange membrane by an ion exchange-reduction deposition method, the cathode catalyst layer is a pure platinum metal layer, and the anode catalyst layer is a Pt / Ir bimetallic layer. The membrane electrode prepared according to the technology of the invention has the advantages that the catalyst layers and a solid electrolyte are tightly and firmly combined, the activity of electrolysis water is high and the electrode stability is high. The overpotential of the electrolysis water of the bimetallic layer positive electrode prepared according to the invention is remarkably lower than those of a monometallic layer positive electrode and a platinum-iridium alloy positive electrode.

The invention discloses a high-resonant-frequency scanner for a scanning tunneling microscope. The scanner comprises a micron-order pinpoint and a micro-cantilever, wherein the micron-order pinpoint and the micro-cantilever are integrally formed through the micro-nano machining technology, the pinpoint is located on the narrow surface of the micro-cantilever, the included angle between the direction of the pinpoint and the normal of the narrow surface of the micro-cantilever is not larger than 45 degrees, and the pinpoint and the micro-cantilever are both made of monocrystalline silicon or monocrystal silicon dioxide and are both plated with platinum-iridium alloy, gold, cobalt, chromium or nickel. According to the scanner, the pinpoint with a curvature radius of 2 nm manufactured with the photolithography and corrosion sharpening technology is suitable for an STM, and the manufactured high-Q-factor high-resonant-frequency micro-cantilever provided with the pinpoint can serve as the scanner of the STM.

The invention discloses a novel platinum alloy electrical contact material and a preparation method thereof, belonging to the electrical contact material. The platinum-iridium alloy comprises the following chemical compositions by weight percent: 5.0-30.0% of Ir, 0.1-5.0% of Nb, 0.1-5.0% of Zr, 0.1-5.0% of Mo, 0.1-5.0% of Ta, 0.1-5.0% of Yb, 0.1-5.0% of Gd, 0.1-5.0% of Tb and the the balance Pt. The preparation method comprises the following steps: proportioning with the metal elemets such as Pt, Ir, Nb, Zr, Mo, Ta, Yb, Gd and Tb according to the design formulation of the chemical compositions, preparing PtIrNbZrMoTaYbGdTb alloy containing nine elemets in a high frequency melting furnace or a medium frequency melting furnace, and adopting rolling, drawing, heat treatment and other technologies to process the alloy and finally obtain the finished product which is shaped like a sheet, a rod, a contact or the like. The alloy material is characterized by high melting point and hardness, corrosion resistance, low contact resistance, high fusion welding resistance and arc ablation resistance and the like, is an electrical contact material with good performance and has wide application prospect in the fields such as aviation, aerospace, ships, automobiles, electrical and mechanical, electric appliances, electronics and communication.

The invention relates to an integrated coated branched vascular stent and a conveying system thereof. A main body and branches of the stent are of an integrated design, and the main body and branches of the stent each is coated with an integrated coating material, so that the incidence rate of internal leakage caused after the stent is implanted can be reduced; the front end of the main body of the stent is a bare stent portion, so that anchoring can be strengthened; the stent edge of the stent main body of the stent and connections between the main body stent and branch stents are provided with platinum-iridium alloy developing points, so that the position of the stent can be dynamically monitored during the release of the stent, and the aim of accurately locating and releasing the stent is achieved. The stent is fixed and released by adopting a binding design, so that the stent can be in a compressive state and firmly fixed to the maximum, the diameter of a conveyor is reduced, and distant-range conveying and operating are facilitated; the conveying system adopts a staged release manner, so that the problem that the existing stents are prone to displacement during release and cannot be readjusted is solved, and the conveying system has a very good market application prospect.

The invention relates to an electrode array manufacturing method. The method includes the following steps of stamping platinum sheets to form platinum electrode wafers, sizing platinum-iridium alloy wires through a wire winding machine to form platinum-iridium electrode lead wires, welding one end of each platinum-iridium electrode lead wire to the center of the corresponding platinum electrode wafer through the electric resistance welding technology to form an electrode, plating the surfaces of the electrodes with insulating layers through the vacuum coating technology to form electrodes with the insulating surfaces, sequentially loading the multiple electrodes with the insulating surfaces onto an electrode array die with silica-gel carriers, conducting thermal processing on the electrode array die to form a solidified blank piece of an electrode array, and trimming the blank piece to form the electrode array. The electrodes are made of safe and stable materials, and therefore biological safety of the electrode array is improved; the vacuum coating technology is adopted, and therefore interference of electric fields between every two adjacent electrodes is reduced, and effectiveness of stimulation is improved.

The invention provides a high-temperature heat flow sensor based on HTCC and its preparation method. According to the sensitive mechanism of the thermopile heat flow sensor, a plurality of filling holes are set on the aluminum nitride green ceramic belt to integrate a plurality of thermocouples, which increases the thermoelectricity. The arrangement density of the couple increases the output potential of the thermocouple, and at the same time greatly improves the test sensitivity of the sensor; according to the difference in the thermal conductivity of the high-temperature resistant material, aluminum nitride is selected as the substrate of the sensor structure and the dielectric material of the middle layer. The choice of aluminum nitride material, platinum / 15% iridium alloy, and palladium gold greatly improves the response time of the sensor; the manufacturing process is simple, the sensitivity is high, the response block is good, the stability is good, and the installation is relatively convenient, which can realize Detection of heat flow in high temperature and large heat flow environments such as aerospace vehicles and engine interiors.