氮化铝陶瓷的主要性能与备制方法简介

Brief introduction of main properties and preparation methods of aluminium nitride ceramics

氮化铝陶瓷是近年来备受关注的一种特种陶瓷材料，在许多行业都有着广泛的应用场景，同时氧化铝陶瓷具备的优秀的热学性能、电学性能与机械性能使得它在电子材料领域的应用市场十分广泛；那么佳日丰泰今天带大家一起来了解氮化铝陶瓷的主要性能与它的备制方法：

Aluminum nitride ceramics are a kind of special ceramics which have attracted much attention in recent years. They have a wide range of applications in many industries. At the same time, the excellent thermal, electrical and mechanical properties of alumina ceramics make it widely used in the field of electronic materials. So Jiarifengtai today brings you together to understand the main properties and preparation of aluminium nitride ceramics. Methods:

热学性能包括热导率和热膨胀系数，理论上氮化铝的导热系数高达到320w.m-k,但是实际上氧化铝陶瓷片成品的导热系数已经达到200w.m-k，其导热系数为氧化铝陶瓷的2~3倍；在室温200℃的环境下，它的热膨胀系数为4.5×10-6℃，与Si和GaAs相接近；

Thermal properties include thermal conductivity and thermal expansion coefficient. Theoretically, the thermal conductivity of aluminium nitride is as high as 320w.m-k, but in fact, the thermal conductivity of alumina ceramics has reached 200w.m-k, which is 2-3 times of that of alumina ceramics.

氮化铝陶瓷是一款很好的绝缘材料，在电学性能方面，当室温电阻＞10^16Ω.m-1;介电常数可以达到8.01MHz以上，其绝缘性能与氧化铝陶瓷性能相当；

Aluminum nitride ceramics is a good insulating material. In terms of electrical properties, when the room temperature resistance is greater than 10 ^ 16_.m-1, the dielectric constant can reach more than 8.01 MHz, and its insulation performance is equivalent to that of alumina ceramics.

机械性能分为室温机械性能和高温机械性能，它的抗折强度在380以上，抗折强度要远远高于氧化铝和氧化铍陶瓷，当温度达到1300℃时氮化铝的抗折弯性能要下降20%.

Mechanical properties can be divided into room temperature mechanical properties and high temperature mechanical properties. Its flexural strength is more than 380, which is much higher than that of alumina and beryllium oxide ceramics. When the temperature reaches 1300 C, the flexural strength of aluminium nitride decreases by 20%.

氧化铝粉体的常用制备方法包括直接氮化法、自蔓延法、碳热还原法、有机盐裂法和气相法。

The common preparation methods of alumina powder include direct nitriding, self-propagating, carbothermal reduction, organic salt cracking and gas phase method.