A kind of method for preparing boron phosphide with high thermal conductivity by molten salt method

Abstract

The invention discloses a method for preparing boron phosphide with high thermal conductivity by a molten salt method; step 1: cleaning the crucible, performing ultrasonic treatment on the crucible and drying it for standby; mixing magnesium powder, boron phosphate and molten salt medium evenly, and placing the crucible in the crucible ; Step 2: Put the crucible into the reaction furnace, pass through the protective gas to raise the temperature to 750°C-850°C and keep it warm for 1h; Step 3: Soak the sample obtained in Step 2 with concentrated hydrochloric acid at room temperature, and heat it in a water bath heat preservation, then wash with deionized water to neutrality, and obtain BP after drying; this method has the advantages of simple process, low synthesis temperature, short heat preservation time, good crystal morphology of synthesized BP powder, and high phase purity; The preparation method is easy to operate, does not require complex process conditions, the process is relatively simple and safe, the cycle is short, and the boron phosphide produced has good quality and high yield.

Description

technical field [0001] The invention belongs to the technical field of preparation of high thermal conductivity thermal management materials, and in particular relates to a method for preparing boron phosphide with high thermal conductivity by a molten salt method. Background technique [0002] Heat dissipation is one of the key factors determining the performance, life and stability of electronic devices. With the miniaturization, integration, and functionalization of electronic devices, and the emergence of new applications such as three-dimensional chip stack structures, flexible electronic devices, and light-emitting diodes, the issue of efficient heat conduction and heat dissipation has attracted more and more attention. At present, the most researched materials with high thermal conductivity and low dielectric loss are AlN and h-BN. However, AlN is easy to hydrolyze, and h-BN has low mechanical properties, low interlayer thermal conductivity, and large thermal expansi...

AI Technical Summary

Problems solved by technology

For the mechanochemical reaction method, the BPO 4 , Mg and NaCl are placed in a stainless steel ball milling tank, and WC is used as a grinding ball, and BP can be obtained by running at a speed of 100-700rpm for 1-5min, but the morphology of the product prepared by this method is not easy to control, the particle size is small, and the purity is low. And it is easy to produce many defects, which will greatly reduce the thermal conductivity of BP

For the high-temperature self-propagating method, BP is synthesized by using the self-heating and self-conduction of the high chemical reaction heat between boron phosphate and metal magnesium. 12 P 2 generation

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