4results about How to "Stable temperature coefficient" patented technology

This invention provides a microwave dielectric ceramic material and its preparation method for low ESR capacitors, belonging to the field of ceramic materials technology. By optimizing the composition and ratio of the main material, sintering aid, and modifying additives, this invention achieves both low dielectric constant and low ESR (high Q value) while maintaining an extremely stable temperature coefficient, effectively solving the problem of simultaneously achieving dielectric performance and temperature stability in existing technologies. The microwave dielectric ceramic material provided by this invention can be sintered in a reducing atmosphere and can be used to prepare low ESR, high Q value, and narrow temperature coefficient copper electrode multilayer ceramic capacitors, avoiding silver migration phenomenon in silver-internal electrode MLCCs, effectively improving device reliability and lifespan. It has broad application prospects in high-end fields such as communication base stations, radar, medical equipment, military industry, and AI servers, and the microwave capacitors prepared from it have significant practical value and market application prospects.

The invention relates to an integrated high-voltage semiconductor device structure and a manufacturing method thereof. The device comprises an N-type epitaxial layer on an N-type substrate, drain electrode metal is arranged on the back surface of the N-type epitaxial layer, the structure of the device is divided into an M1 device region, an M2 device region and an isolation region, P-type columns are arranged in the N-type epitaxial layer, and a P-type body region is arranged above the P-type columns and is connected with N-type and P-type source electrodes with different doping; an M2 device region is provided with a threshold adjustment region, and the surface of the device is covered with a gate oxide layer and a polycrystalline silicon gate; the dielectric layers are respectively distributed in each region; the M1 source electrode metal and the M2 source electrode metal are connected with the source electrode of the P-type body region; the isolation region is provided with a diode, anode metal is connected with an N-type source electrode, cathode metal is connected with a P-type source electrode, or second grid polycrystalline silicon is arranged and is respectively connected with heavily-doped N-type polycrystalline silicon, heavily-doped P-type polycrystalline silicon and cathode and anode metal. According to the invention, the loss of circuit topology is reduced, and the system efficiency and integration are improved.

The invention discloses a barium titanate ceramic capacitor material and a preparation method thereof, the composition of the barium titanate ceramic capacitor material is represented as (1-a-b-c-d-e) BaTiO3-aNb2O5-bGd2O3-cB2O3-dSiO2-eMn3O4, a = 0.008-0.012, b = 0.002-0.005, c = 0.001-0.004, d = 0.001-0.004, and e = 0.002-0.004, the preparation method comprises the following steps: (1) mixing Nb2O5, Gd2O3, B2O3, SiO2 and Mn3O4 according to a ratio, carrying out mixing, ball milling and sieving, and then carrying out first sintering treatment; (2) adding BaTiO3 into the material prepared in the step (1), mixing and ball-milling, and drying; and (3) carrying out compression molding on the material obtained in the step (2), and then carrying out secondary sintering treatment. The barium titanate ceramic capacitor material disclosed by the invention realizes low loss and high temperature stability while keeping relatively high dielectric.

The utility model discloses an embodiment provides a kind of measuring head, the measuring head includes main body, main body includes at least one spring parallelogram assembly, spring parallelogram assembly includes the plate body that is arranged in parallel along first direction, the connecting plate being arranged between plate body and the spring leaf of connecting adjacent plate body and connecting plate, and spring parallelogram assembly further includes the displacement sensor being arranged along first direction, displacement sensor includes the coil with inner hole and the magnet bar being inserted in inner hole, this structure is not sensitive to dust, oil stain, cutting fluid etc. due to coil and magnet bar, expand the environmental adaptability of three coordinate measuring machine, simultaneously, relatively insensitive to mechanical vibration, and coil and magnet bar between it can be set larger gap, reduce the control difficulty of three coordinate measuring machine and improve detection precision, in addition, the temperature coefficient of magnet and coil material is relatively stable, and there is no physical contact between magnet bar and coil, precision will not be reduced due to mechanical wear.