Method for producing spherical silicon nitride powder

    公开(公告)号:US10384941B2

    公开(公告)日:2019-08-20

    申请号:US15839995

    申请日:2017-12-13

    Abstract: A method utilizes easily obtained carbon as carbon source for sintering, followed by high energy ball milling process with planetary ball mill for high energy homogenous mixing of the carbon source, solvent and nano-level silicon dioxide powder, along with a high energy ball milling process repeatedly performed using different sized ball mill beads, so as to formulate a spray granulation slurry with the optimal viscosity, to complete the process of micronization of carbon source evenly encapsulated by silicon dioxide powders. The optimal ratio of C/SiO2 is 1-2.5 to produce a spherical silicon dioxide powder (40-50 μm) evenly encapsulated by the carbon source. The powder is then subjected to a high temperature (1450□) sintering process under nitrogen gas. Lastly, the sintered silicon nitride powder is subjected to homogenizing carbon removal process in a rotational high temperature furnace to complete the fabricating process.

    Optical housing for high power fiber components

    公开(公告)号:US10365442B2

    公开(公告)日:2019-07-30

    申请号:US16112842

    申请日:2018-08-27

    Abstract: An optical housing for high power fiber components includes an upper cover, a lower base, and two isolating members. The upper cover includes a light-reflecting portion for containing the optical fiber and receiving and reflecting the light therefrom. The lower base is connected with the upper cover and includes a light-receiving portion which corresponds to the light-reflecting portion in position and surrounds the optical fiber, thereby receives the light from the light-reflecting portion. The isolating members are disposed between the upper cover and the lower base and located on two sides of the optical housing to prevent the leakage of light from the optical fiber.

    Array antenna communication system and method therefor

    公开(公告)号:US10355354B2

    公开(公告)日:2019-07-16

    申请号:US15641396

    申请日:2017-07-05

    Abstract: Array antenna communication system is introduced, which is a communication system that receives a location signal generated by a mobile communication apparatus and accordingly transfers a communication signal with a corresponding phase direction. The system includes an array antenna module and a beamforming circuit. The array antenna module includes a plurality of antenna units arranged in array form. The beamforming circuit is used for receiving a plurality of location signals, a plurality of phase control signals, and transferring a plurality of output signals, wherein the beamforming circuit receives the location signal and accordingly generates the corresponding control signal, and controls the corresponding antenna unit of the array antenna module, so as to enable the antenna unit to move to a position corresponding to a phase and to transfer the plurality of output signals, thereby achieving communication signal enhancement.

    Measurement, calibration and compensation system and method for machine tool

    公开(公告)号:US10189133B2

    公开(公告)日:2019-01-29

    申请号:US15388496

    申请日:2016-12-22

    Abstract: A measurement, calibration and compensation system for machine tool includes a first positioning base; two first speckle image sensors for sensing speckle positions of an object holding unit at a first XY plane and a first XZ plane of the first positioning base before and after the machine tool is started for machining; a second positioning base; two second speckle image sensors for sensing speckle positions of a cutter holding unit at a second XY plane and a second YZ plane of the second positioning base before and after the machine tool is started for machining. Thus, the thermal expansion at all axes of the machine tool can be measured in a simplified and low-cost way, and the absolute positioning coordinates of all axes of the machine tool can be calibrated in real time to avoid reduced positioning accuracy due to the thermal expansion of the multi-axis machine tool.

    Battery active balancing system
    138.
    发明授权

    公开(公告)号:US10063070B2

    公开(公告)日:2018-08-28

    申请号:US15361321

    申请日:2016-11-25

    Abstract: A battery active-balancing system comprises an external balancing power; a buck converter having a first side-winding and a second side-winding induced thereby, the first side-winding and the second side-winding each having a positive terminal and a negative terminal; a battery comprising series-connected cell-units each having a positive terminal and a negative terminal; a cell voltage-sensing unit coupled to the battery to sense a voltage of each cell unit of the series-connected cell-units; a main switch component coupled to the first side-winding and the battery in an ON state, or coupled to the first side-winding and the external balancing power in an OFF state; a cell-switch unit comprising first cell-switch components and second cell-switch components, wherein each of the first cell-switch components is coupled to the positive terminal of corresponding one cell-unit and the positive terminal of the second side-winding, and each of the second cell-switch components is coupled to the negative terminal of corresponding one cell-unit and the negative terminal of the second side-winding; and a microcontroller for controlling the main switch component and the cell-switch unit, and determining a voltage level fed back from the cell voltage-sensing unit.

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