A kind of preparation method of boron nitride coating on the surface of hot wire
A technology of boron nitride and coating, which is applied in the field of preparing boron nitride film coating on the surface of hot wire by electrophoretic deposition, which can solve the problems of test voltage signal distortion, leakage current, and polarization of hot wire surface, etc., and achieve the goal of device equipment The effect of low requirements, prevention of leakage current, and excellent insulation performance
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[0019] The invention relates to a method for preparing a boron nitride coating on the surface of a hot wire. By electrophoretic deposition, a suspension made by mixing boron nitride powder and an organic solvent is used to measure the thermal conductivity of a conductive medium. A boron nitride coating was prepared on the surface of the wire. Boron nitride is a high thermal conductivity insulating material, which can effectively prevent the "leakage current" phenomenon when measuring the thermal conductivity of conductive media, and can ensure the accuracy of measurement data. The preparation method of the present invention has low requirements on devices and equipment, and a high-purity and high-density boron nitride coating can be electrophoretically deposited at room temperature through a self-built experimental device, and the operation is simple and the cost is low. The hot wire in the present invention refers to the hot wire used to measure the thermal conductivity of th...
Embodiment 1
[0035] Electrophoretic deposition method is used to coat the high thermal conductivity insulating boron nitride layer on the fixed hot wire
[0036] 1) Preparation of suspension
[0037] Put the proportioned boron nitride, absolute ethanol and a small amount of dispersant into a beaker, and ultrasonically disperse under ultrasonic waves for 2 to 3 hours to form a stable suspension. The solid content of boron nitride is 2vol%;
[0038] 2) Cleaning of platinum wire
[0039] Polish the surface of the platinum wire with fine sandpaper, ultrasonically clean it with deionized water, acetone, ethanol, and deionized water for 20 minutes in an ultrasonic wave, and dry it in an oven at 80 °C for 2 hours after cleaning;
[0040]3) Electrophoretic deposition coating
[0041] Put the platinum wire into the self-made electrophoretic deposition device, control the distance between the two electrodes to be 10mm, the deposition voltage is 150V, and the deposition time is 10min to obtain a un...
Embodiment 2
[0048] Electrophoretic deposition method is used to coat the high thermal conductivity insulating boron nitride layer on the fixed hot wire
[0049] 1) Preparation of suspension
[0050] Put the proportioned boron nitride, absolute ethanol and a small amount of dispersant into a beaker, and ultrasonically disperse under ultrasonic waves for 2 to 3 hours to form a stable suspension. The solid content of boron nitride is 5vol%;
[0051] 2) Cleaning of platinum wire
[0052] Polish the surface of the platinum wire with fine sandpaper, ultrasonically clean it with deionized water, acetone, ethanol, and deionized water for 20 minutes in an ultrasonic wave, and dry it in an oven at 80 °C for 2 hours after cleaning;
[0053] 3) Electrophoretic deposition coating
[0054] Put the platinum wire into the self-made electrophoretic deposition device, control the distance between the two electrodes to be 15mm, the deposition voltage is 60V, and the deposition time is 10min to obtain a un...
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