8 results about "Lead telluride" patented technology

The invention discloses a far-infrared band optical thin film, a preparation method thereof and an optical element, and relates to a far-infrared band optical thin film technology, the far-infrared band optical thin film comprises a substrate, a front band-pass film system and a back cut-off film system; wherein the front band-pass film system is located on one side of the substrate, and the back cut-off film system is located on the other side of the substrate; the far infrared band optical thin film is prepared by alternately depositing lead telluride serving as a high-refractive-index thin film material and cadmium telluride serving as a low-refractive-index thin film material. The far infrared band optical thin film can cut off the band with the wavelength smaller than 4 microns, and the average transmittance is 0.23%; anti-reflection is carried out at the wave band of 5-50 microns; the moisture-resistant performance is excellent.

The invention discloses a front exhaust gradient waste heat power generation system of a new energy hybrid electric vehicle, and relates to the technical field of automobile energy conservation. The system comprises a gradient thermoelectric conversion module, a composite heat dissipation module, an intelligent energy management module and an elastic fixing and sealing module which are arranged in the axial direction of a front exhaust pipe. The gradient thermoelectric module adopts a lead telluride / bismuth telluride dual-material design and is respectively matched with a front exhaust high-temperature area and a front exhaust medium-temperature area; the composite heat dissipation system combines liquid cooling and air cooling to realize temperature difference stable control; the intelligent energy management module is linked with a whole vehicle system through a CAN bus and dynamically distributes electric energy; the elastic fixing mechanism solves the problems of vibration and sealing. The comprehensive conversion efficiency reaches 8%-12%, the fuel economy of the whole vehicle can be improved by 4%-6%, the system is suitable for the frequent start-stop working condition of the hybrid electric vehicle, installation and maintenance are convenient and fast, and the remarkable energy-saving effect and industrialization value are achieved.

The present invention provides a method for preparing lead telluride powder, comprising the following steps: S1, ball-milling lead powder and tellurium powder to uniformly mix to obtain a mixed raw material; the particle size of the lead powder and tellurium powder can pass through a 200-mesh sieve; S2, placing the mixed raw material in a horizontal tube furnace, introducing a protective gas into the tube furnace to replace the air; S3, after the gas replacement is completed, stopping the introduction of the protective gas, then introducing hydrogen, and heating the mixture to 270-300°C for a heat-insulating reaction; S4, after the heat-insulating reaction is completed, cooling the mixture to obtain the lead telluride powder. The preparation method of the present invention is simple to operate, and by controlling the raw material particle size and reaction temperature, a one-step synthesis reaction is performed to obtain lead telluride powder, without the need for crushing, resulting in a fast synthesis and high yield. The method is also short in process, low in cost, safe, environmentally friendly, and suitable for industrial application.

The utility model discloses a cover plate with thermoelectric performance, comprising a glass layer, the upper surface of the glass layer is provided with a zirconium rhodium layer, the upper surface of the zirconium rhodium layer is provided with a bismuth tritelluride layer, the upper surface of the bismuth tritelluride layer is provided with a lead telluride layer, and the upper surface of the lead telluride layer is provided with a silicon nitride layer. And the extension areas of the zirconium rhodium layer, the bismuth tritelluride layer and the lead telluride layer are consistent. Zirconium dirhodium is used as a bottom layer, so that good adhesiveness and stability are achieved, and a solid foundation is provided for the whole coating layer. Bismuth tritelluride is used as an intermediate layer, and the excellent thermoelectric performance of bismuth tritelluride is utilized, so that the functions of energy conversion and temperature sensing are realized. The lead telluride is used as the top layer, the thermoelectric performance of the coating layer is further enhanced, and the thickness and composition of the coating layer can be adjusted according to specific requirements. The cover plate with the thermoelectric performance not only has excellent adhesive force and stability, but also has excellent thermoelectric performance, and can be applied to energy conversion, temperature sensing and the like.

The invention relates to a thermoelectric battery based on an aerogel ultra-black material and a thermoelectric material and a preparation method of the thermoelectric battery. The battery comprises a heat absorption layer, a thermoelectric layer and an electrode layer. The heat absorption layer is made of an ultra-black material of silicon oxide aerogel suspended light absorption nanoparticles, and has high light absorptivity (gt, 98%) and excellent high-temperature-resistant stability and mechanical properties. The thermoelectric layer is made of high-performance thermoelectric materials (such as bismuth telluride (BiTe)-based materials, lead selenide (PbSe), lead telluride (PbTe), silicon germanium alloy (SiGe) and silver-based thermoelectric materials AgSe, AgSbTe and the like), and the temperature difference generated by the heat absorption layer is efficiently converted into electric energy. And the electrode layer is made of a high-conductivity material and is used for collecting and outputting electric energy. The thermoelectric cell provided by the invention has the characteristics of efficient energy conversion, broadband absorption, high temperature resistance and excellent mechanical properties, and is suitable for the fields of solar energy utilization, waste heat recovery, wearable equipment, aerospace and the like.

The invention discloses a tellurium nanowire preparation method based on a chemical vapor deposition method and application thereof, and belongs to the field of one-dimensional nano material preparation, the preparation method comprises the following steps: placing lead telluride powder in a source region of a chemical vapor deposition system, and placing a substrate in a downstream deposition region of the source region; vacuumizing the chemical vapor deposition system, and introducing inert protective gas; the source area is heated to the growth temperature, meanwhile, the temperature of a deposition area where the substrate is located is kept at a certain temperature, and heat preservation growth is carried out under the condition; and after the growth is finished, naturally cooling the chemical vapor deposition system, and obtaining the tellurium nanowire on the surface of the substrate. According to the method disclosed by the invention, the high-purity single-crystal Te nanowire can be directly and efficiently grown on the substrate.

The present invention discloses a far-infrared optical film, a preparation method, and an optical element, relating to far-infrared optical film technology. The far-infrared optical film comprises a substrate, a front bandpass film system, and a rear cutoff film system. The front bandpass film system is located on one side of the substrate, and the rear cutoff film system is located on the other side of the substrate. The far-infrared optical film is prepared by alternating deposition of lead telluride as a high-refractive-index film material and cadmium telluride as a low-refractive-index film material. The far-infrared optical film of the present invention can achieve cutoff for wavelengths less than 4 μm, with an average transmittance of 0.23%, enhances transmittance in the 5-50 μm band, and exhibits excellent moisture resistance.

A method for preparing an n-type lead telluride-based thermoelectric material with synergistically improved high-temperature stability and thermoelectric performance, using the chemical formula PbTe. 1‑x I x A composite material was prepared by introducing 0.25–0.75 wt.% micron-sized metallic Mo powder into an n-type iodine-doped PbTe matrix, followed by ball milling and spark plasma sintering (SPS). Utilizing the high melting point of Mo powder and its chemical affinity for Te, a physical barrier was constructed at the grain boundaries, forming Mo-Te bonds that effectively suppressed Te volatilization at high temperatures. Simultaneously, the matching thermal expansion coefficients of Mo and PbTe prevented the formation of microcracks during thermal cycling. Experiments showed that the sample with 0.5 wt.% Mo exhibited significantly improved thermoelectric performance retention after long-term aging at 750 K without sacrificing the room-temperature thermoelectric figure of merit. This invention features a simple and low-cost process, significantly improving the high-temperature service stability of n-type PbTe materials, and is suitable for the field of thermoelectric power generation.