A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for preparing high-strength and high-thermal-conductivity aluminum nitride through hot pressed sintering
The invention aims to prepare an aluminum nitride ceramic material with high strength and high thermal conductivity, and belongs to the technical field of ceramic material preparation. In order to obtain the aluminum nitride ceramic with low oxygen content and fine grain structure, a novel method of pre-sintering, hot pressed sintering and high-temperature annealing is designed, wherein the pre-sintering temperature is 1400-1600 DEG C, the sintering time is 2-5 hours, the hot pressing sintering temperature is 1650-1800 DEG C, the sintering time is 0.5-3 hours, the sintering pressure is 15-45 MPa, the annealing temperature is 1750-1800 DEG C, and the annealing time is 3-8 hours. According to the method, presintering oxygen reduction and annealing deoxidation are utilized, so that the impurity oxygen content, especially the lattice oxygen content, of the aluminum nitride ceramic is effectively reduced. Therefore, under the condition of ensuring the strength, the heat conductivity of the aluminum nitride ceramic is remarkably improved, and the aluminum nitride ceramic has high practical value. The ceramic prepared by the method has the advantages of fine grains and low impurity oxygen content, the average grain size is less than 3 microns, the thermal conductivity is higher than 200W/m.k, the total oxygen content is lower than 1%, and the bending strength is higher than 350MPa.
本发明的目的是制备一种高强度高导热率的氮化铝陶瓷材料，属于陶瓷材料制备技术领域。为得到低氧含量，细晶粒组织的氮化铝陶瓷，设计出一种采用预烧结‑热压烧结‑高温退火的新方法：预烧结温度为1400～1600℃，烧结时间为2～5h；热压烧结温度为1650～1800℃，烧结时间为0.5～3h，烧结压力为15～45MPa；退火温度为1750～1800℃，退火时间为3～8h。本发明利用预烧结降氧与退火脱氧，有效的降低了氮化铝陶瓷的杂质氧含量，尤其是晶格氧含量。在保证强度的条件下，显著提升了氮化铝陶瓷的热导率，具有高的实用价值。经此方法制备出的陶瓷具有细晶、低杂质氧含量的优势，其平均晶粒尺寸小于3μm，热导率高于200W/m·k，总氧含量低于1％，抗弯强度高于350MPa。
Method for preparing high-strength and high-thermal-conductivity aluminum nitride through hot pressed sintering
The invention aims to prepare an aluminum nitride ceramic material with high strength and high thermal conductivity, and belongs to the technical field of ceramic material preparation. In order to obtain the aluminum nitride ceramic with low oxygen content and fine grain structure, a novel method of pre-sintering, hot pressed sintering and high-temperature annealing is designed, wherein the pre-sintering temperature is 1400-1600 DEG C, the sintering time is 2-5 hours, the hot pressing sintering temperature is 1650-1800 DEG C, the sintering time is 0.5-3 hours, the sintering pressure is 15-45 MPa, the annealing temperature is 1750-1800 DEG C, and the annealing time is 3-8 hours. According to the method, presintering oxygen reduction and annealing deoxidation are utilized, so that the impurity oxygen content, especially the lattice oxygen content, of the aluminum nitride ceramic is effectively reduced. Therefore, under the condition of ensuring the strength, the heat conductivity of the aluminum nitride ceramic is remarkably improved, and the aluminum nitride ceramic has high practical value. The ceramic prepared by the method has the advantages of fine grains and low impurity oxygen content, the average grain size is less than 3 microns, the thermal conductivity is higher than 200W/m.k, the total oxygen content is lower than 1%, and the bending strength is higher than 350MPa.
本发明的目的是制备一种高强度高导热率的氮化铝陶瓷材料，属于陶瓷材料制备技术领域。为得到低氧含量，细晶粒组织的氮化铝陶瓷，设计出一种采用预烧结‑热压烧结‑高温退火的新方法：预烧结温度为1400～1600℃，烧结时间为2～5h；热压烧结温度为1650～1800℃，烧结时间为0.5～3h，烧结压力为15～45MPa；退火温度为1750～1800℃，退火时间为3～8h。本发明利用预烧结降氧与退火脱氧，有效的降低了氮化铝陶瓷的杂质氧含量，尤其是晶格氧含量。在保证强度的条件下，显著提升了氮化铝陶瓷的热导率，具有高的实用价值。经此方法制备出的陶瓷具有细晶、低杂质氧含量的优势，其平均晶粒尺寸小于3μm，热导率高于200W/m·k，总氧含量低于1％，抗弯强度高于350MPa。
Method for preparing high-strength and high-thermal-conductivity aluminum nitride through hot pressed sintering
一种热压烧结制备高强度高热导率氮化铝的方法
QIN MINGLI (author) / ZHANG ZHIRUI (author) / LIU CHANG (author) / WU HAOYANG (author) / JIA BAORUI (author) / QU XUANHUI (author)
2021-05-18
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Method for preparing high-thermal-conductivity silicon nitride ceramic through hot pressed sintering
| European Patent Office | 2021
| European Patent Office | 2021
Method for preparing high-strength aluminum nitride ceramic through low-temperature sintering
| European Patent Office | 2023
| European Patent Office | 2021
| European Patent Office | 2020