AlN陶瓷的介电性能

着重探讨了ＡｌＮ陶瓷的极化机理，应用基本的电介质物理理论，结合ＡｌＮ陶瓷的组成特点，研究了ＡｌＮ陶瓷介电性能随测量温度、测量频率变化而变化的温度特性和频率特性，结果表明：ＡｌＮ陶瓷的主要极化机理及空间电荷极化；经典的极化理论适用于ＡｌＮ陶瓷；ＡｌＮ陶瓷因介电性能较好，导热率较高崦有望成为比Ａｌ２Ｏ３陶瘊性能更加优良的基板材料。     

AlN/W多层体共烧过程中的应力

研究了１８５０℃高温烧结ＡｌＮ／Ｗ多层体烧结应力状态和产生原因，结果表明ＡｌＮ与Ｗ在１８５０℃共烧时，不同阶段烧结应力状态有所不同，在升温阶段，Ｗ层受平面拉应力作用，Ｗ层烧结速率降低，导致表面Ｗ膜内存在的大量空洞，而内部Ｗ布线受到径向拉应力的作用，在保温阶段，与表面Ｗ焊盘接触的ＡｌＮ受到拉应力的作用，与内部Ｗ线接触的ＡｌＮ受到环向拉应力的作用，由于环向拉应力的存在，导致ＡｌＮ的烧结速度帮烧结密度显     

AlN瓷的制备方法

本实验直接采用Ａｌ２Ｏ３粉还原氮化制备ＡｌＮ瓷，以简化ＡｌＮ瓷的制备工艺，提高ＡｌＮ瓷性能，降低成本。结果表明烧结体的主晶相确定为ＡｌＮ，且瓷导热率最高可达１０４Ｗ／ｍ．Ｋ。     

冲击波对AlN粉体性能及低温烧结特性的影响

研究了冲击波对ＡｌＮ粉体性能的影响，并探索了以冲击波处理的ＡｌＮ粉体为原料，添加５％助烧结剂的低温结过程。结果表明，冲击波处理ＡｌＮ粉将使晶粒产生大量的晶格略变，从而活化了粉体。以冲击波处理的ＡｌＮ粉为原料，在１６１０℃下进行无压烧结，可得到密为３．３３ｇ／ｃｍ＾３的ＡｌＮ陶瓷。     

AlN—BN复合陶瓷的介电性能

以ＡｌＮ－ＢＮ复合陶瓷为研究对象，着重探讨了ＡｌＮ－ＢＮ复合陶瓷的极化机理，应用基本的介电介质物理理论，结合ＡｌＮ－ＢＮ复合陶瓷组成和结构特点，研究了ＡｌＮ－ＢＮ复合陶瓷介电性能（介电常数，介电损耗角正切值）随测量温度，测量频率变化而发生变化的温度特性和频率特性。     

添加剂对自蔓延高温合成AlN的影响

着重研究了添加剂对自蔓延高温合成ＡｌＮ中的含氧量增加的影响,讨论了ＡｌＮ中的氧量增加的影响,讨论了ＡｌＮ形态与含氧量之间的关系。疏松剂ＮＨ４Ｃｌ虽可使得产物疏松,易于破碎,但它增加了体系中水蒸汽量,促进ＡｌＮ中含量的增加。     

AlN—BN复合陶瓷的研究

本文用热压法烧结制备出ＡｌＮ—ＢＮ复合陶瓷，讨论了组成及烧结条件对ＡｌＮ—ＢＮ复合陶瓷性能及显微结构的影响。通过优化组成，使ＡｌＮ—ＢＮ复合陶瓷垂直于加压方向的导热率最大达１０３Ｗ／ｍ·Ｋ。ＡｌＮ—ＢＮ复合陶瓷的导热率和显微结构各向异性较显著。     

AlN瓷TiN—Mo金属化方法研究

以Ｍｏ，ＴｉＮ为主要原料，采用金属粉末烧结法在ＡｌＮ瓷表面实现了金属化。探讨了金属化的工艺条件，运用ＸＰＳ，ＸＲＤ，ＳＥＭ等现代化分析技术研究了界面及粘附机理。研究表明，液相的扩散，渗透，特别是ＡｌＮ瓷坯中的液相向金属化层的渗透是金属化层与ＡｌＮ瓷结合的主要原因。     

SiCw—AlN复合材料工艺因素的研究

本文了工艺因素对ＳｉＣｗ－ＡｌＮ复合材料的影响。结果表明，１８５０℃是较合适的复合材料烧结温度，复合材料力学性能与添加剂组成和含量有密切关系。Ｙ２Ｏ３与ＳｉＯ２在烧结中起的作用下不同，Ｙ２Ｏ３与ＡｌＮ表面的Ａｌ２Ｏ３形成液相，是一种良好的烧结添加剂，而ＳｉＯ２由于与ＡｌＮ形成２７ＲＳｉａｌｏｎ多形体，反而阻碍材料致密化。     

应用前景广阔的氮化铝

氮化铝（ＡｌＮ）是非氧化性高功能的陶瓷材料，有许多优异的物理化学性质，日益被人们所重视。简要介绍ＡｌＮ国内外概述、各种物理化学性质、用途和生产工艺。     

DENSIFICATION OF ALUMINUM NITRIDE-BASED CERAMIC MATERIALS SYNTHESIZED BY COMBUSTION OF ALUMINUM IN AIR

Aluminum nitride based materials were synthesized by combustion of aluminum powder in air. When aluminum nitride powder is used as a diluent, mostly aluminum nitride product with small amount of alumina was obtained. For reactant mixtures consisting of 33 wt% of aluminum and 67 w% of alumina, materials with a high content of aluminum oxynitride (AION) were formed. Synthesized aluminum nitride based powders with and without in-situ added sintering aids were characterized and tested for their sintering ability. Densification characteristics of combustion synthesized powders by pressureless sintering in nitrogen atmosphere are also reported.     

氮化铝粉体工程的研究进展

电子技术微型化、轻型化、高集成和大功率的发展,对基板和封装材料提出更高要求。氮化铝陶瓷具有高导热性、绝缘性、热膨胀系数与半导体硅相近、机械强度高、化学稳定性好、无毒无害等优良特性,是理想的基板材料之一,具有很好的发展前景。高质量氮化铝粉体是制备高性能氮化铝陶瓷的关键。本文分别归纳介绍了微米/纳米氮化铝合成的新技术、新方法及其研究进展,并展望了氮化铝粉体合成的发展趋势。     

Preparation of nano-AlN powder by sol–gel foaming and its sintering properties

Uniformly dispersed nano-sized aluminum nitride powders were prepared by the sol–gel foaming method using aluminum nitrate as the aluminum source, sucrose as the carbon source, and ammonium chloride as the foaming agent. The effects of ammonium chloride content on the particle size and the sintering properties of aluminum nitride were investigated. The results showed that when the molar ratio of ammonium chloride to aluminum nitrate was .5, the colloidal foams were uniform, large, and fluffy, and amorphous alumina precursors with uniform particles could be prepared. Aluminum nitride powder with a particle size of 22–27 nm can be obtained by calcining these precursors in nitrogen atmosphere at 1400°C for 2 h. At the same time, aluminum nitride bulk material with a relative density of 95% can be obtained by sintering the compact samples in nitrogen atmosphere at 1700°C for 2 h.     

Synthesis of Aluminum Nitride/Boron Nitride Composite Materials

Aluminum nitride/boron nitride composite was synthesized by using boric acid, urea, and aluminum chloride (or aluminum lactate) as the starting compounds. The starting materials were dissolved in water and mixed homogeneously. Ammonolysis of this aqueous solution resulted in the formation of a precomposite gel, which converted into the aluminum nitride/boron nitride composite on further heat treatment. Characterization of both the precomposite and the composite powders included powder X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Analysis of the composite revealed that the aluminum nitride phase had a hexagonal structure, and the boron nitride phase a turbostratic structures.     

氮化铝陶瓷的研制及应用

氮化铝 (AlN)因具有高热导率、低介电常数、与硅相匹配的热膨胀系数及其他优良的物理特性 ,在新材料领域越来越引起人们的关注。此文主要介绍并分析了AlN粉体合成、烧结、性能结构、AlN陶瓷的应用与前景     

Improvement of piezoresistance properties of silicon carbide ceramics through co-doping of aluminum nitride and nitrogen

The piezoresistance coefficient was measured on co-doped silicon carbide ceramics. Evaluation samples of -silicon carbide ceramics were first fabricated by glass capsule HIP method using powder mixture of silicon carbide and aluminum nitride with various ratios. The resultant aluminum nitride added silicon carbide ceramics were doped with nitrogen by changing the post-HIP nitrogen gas pressure. The lattice parameter increased with the amount of adding aluminum nitride indicating that the incorporated aluminum substituted smaller silicon atoms. After post-HIP treatment, lattice parameter then decreased with nitrogen gas pressure. The piezoresistive coefficient increased with the addition of aluminum nitride, it further increased with the nitrogen doping pressure.     

Ceramics based on boron nitride obtained by reaction-based sintering

Reaction-based sintering of ceramics based on hexagonal boron nitride is investigated. It is found that the use of presintered aluminum nitride milled to the particle size of 45 – 125 μm is significantly more efficient than using finely disperse boron nitride or coarsely disperse aluminum nitride as the inert filling agent. Translated from Steklo i Keramika, No. 1, pp. 14–17, January, 1999.     

AlN and intermetallic compound layers formed between aluminum and austenitic stainless steel using barrel nitriding

Recently, a new nitriding process was proposed to produce the aluminum nitride on an aluminum surface using a barrel. After barrel nitriding, AlN nitride layer is formed on the aluminum surface and the surface hardness can be improved remarkably. In this study, barrel nitriding was performed to investigate the interface between aluminum substrate, with SUS304 austenitic stainless steel used for a physical catalyst. The barrel nitriding was carried out at 893 K for 18 ks, 25.2 ks and 36 ks, respectively with aluminum and aluminum–magnesium alloy powder. After barrel nitriding, aluminum nitride layer and Fe–Al intermetallic compound layers were formed at the interface between pure aluminum and austenitic stainless steel at the same time. The thickness of the aluminum nitride layer and intermetallic layer was increased by increasing the treatment time.     

Self-Combustion Reactions Induced by Mechanical Activation: Formation of Aluminum Nitride from Aluminum–Graphite Powder Mixture

The powders of aluminum metal and natural graphite mixed in various molar ratios (Al/C = 7/0–0/7) were ground in a planetary ball mill. When the mixtures thus activated mechanically were exposed to air, exothermic reactions spontaneously occurred in two successive steps, evolving red heat initially and then white heat. The main product was aluminum carbide in the first step and aluminum nitride as well as carbide in the second step. From the measurements of XPS spectra and the lattice constants, it was concluded that the aluminum nitride obtained is solid solution with the composition of (Al₂OC)_1–x(AlN)_x. The effects of mixing ratio of Al to C, grinding time, and gas atmosphere on the formation of aluminum nitride are discussed.     

AlN改善Al2O3陶瓷导热性能的研究

本文选用导热系数较高的AlN来改善Al2O3陶瓷的导热性能;并借助SEM和XRD对材料的微观结构和物相进行了分析.结果表明：AlN/Al2O3基复合材料的导热性能随AlN含量的增加呈现先增大后减小的有规律变化,并在AlN的外加量达到7%时具有最佳值;另外,探讨了AlN的加入导致主晶相Al2O3的晶胞参数、晶粒大小、烧结气孔率的变化及它们对材料导热性的影响规律.