The new metal film future The material or will be used to manufacture sensors and other micro-electromechanical systems (MEMS) equipment, its tensile strength, heat resistance, high temperature performance Sensor than silicon strong. Today's technology is changing, both the car, the Internet of things, the engine or the public facilities are inseparable from the micro-sensor support and promotion. The problem, however, is that such sensors are usually made of silicon, but the lack of physical properties of silicon limits its future use. Kevin J. Hemker, a material scientist and mechanical engineer at Johns Hopkins University, has been successful in researching new materials that will help ensure that such sensors continue to meet future technology requirements.
Most micro-electromechanical devices MEMS internal structure is complex, its size is smaller than the width of human hair, the main component of silicon. At room temperature, the equipment works well, but after a moderate heat (heating several hundred degrees Celsius), the material will lead to its loss of strength and electronic signal transmission capacity. In addition, silicon is brittle and fragile. Silicon was once the core of micro-electromechanical systems technology, its products after several generations without failure. However, today Fuel Rail Pressure Sensor the material is not the ideal choice for manufacturers, the future of such MEMS equipment will be used in the Internet of things related equipment, such equipment on the material of high temperature, high pressure requirements are high. Obviously, silicon can not do the job.
This requires researchers to develop strength and density greater, conductive, thermal conductivity more advanced materials. In addition, the requirements for shape maintenance are also higher, its production and shaping must meet the micro standard. For the development of such new materials, the researchers consider the use of nickel-containing metal, which is a commonly used advanced structural materials. For example, nickel-based superalloys are used to make jet engines. In view of the stability of the appearance of the demand, the researchers made a lot of experiments, they will metal molybdenum, tungsten, trying to enhance the thermal expansion of pure nickel corresponding to the temperature limit. Johns Hopkins University's research team used a larger test equipment, similar to the refrigerator, the team used ions to hit the target, the alloy gas and maintain the atomic state, so that the accumulation of the surface or substrate , And then produced a peelable film, and ultimately produced Temperature Sensor a separate alloy film, the average thickness of 29 microns, smaller than the human hair. Structure of the alloy film to the comprehensive performance of a very strong balance of the material properties. The film is extremely resistant to high temperature, thermal stability and mechanical stability. The atomic arrangement of the internal crystal structure of the alloy, the strength of the material is particularly high. This structure enhances the strength of the material and does not affect the electrical conductivity of the material.
This type of independent film has superior characteristics. The film exhibits a strong tensile strength during the tensile test, which means that the shape retention ability is extremely strong and does not deform or break, and its tensile strength is three times that of high strength steel. Although Speed Sensor a very small number of other materials also have similar tensile strength, but those materials are neither high temperature, can not easily process forming and manufacturing MEMS components. The alloy will help to enhance its strength and heat resistance.