Aluminium nitride ceramics

P. N. Kumta, Processing Aspects of Glass-Nicalon Fibre and Interconnected Porous Aluminium Nitride Ceramic and Glass Composites, J. Mat. Sci. 31, 6229-6240 (1996). 

The carbides and nitrides are well known for their hardness and strength, and this section will briefly compare a number of these properties with those of the pure metals. Concentration will be placed here on the first row compounds, since these constitute a complete series, and Mo and W, since these are the most commonly studied metals. As will be shown, the physical and mechanical properties of carbides and nitrides resemble those of ceramics not those of metals. Comparisons will be made with boron carbide (B4C), silicon carbide (SiC), aluminium nitride (AIN), silicon nitride (Si3N4), aluminium oxide (A1203), and diamond, as representative ceramic materials. 

Schober R, Richter HJ (1999) Composite ceramics based on silicon nitride or aluminium nitride. In Krams J (ed) Proceedings Biennial Worldwide Congress UNITECR 99, Verlag Stahleisen, Diisseldorf, p 198... 

Nieto, M.I., Martinez, R., Mazerolles, L., Baudin, C. (2004), Improvement in the thermal shock resistance of alumina through the addition of submicron-sized aluminium nitride particles , J. Eur. Ceram. Soc., 24, 2293-2301. 

M. Descamps, B. Thierry, A. Leriche, Powder characteristics influence on the properties of tape casted alumina and aluminium nitride materials. Extended abstract of International Conference on Shaping of Advanced Ceramics, April 25-27,1995, Mol, Belgium. 

The only useful materials for heat removal are metal or ceramics. The ceramics obviously can be used as a substrate material in their own right, and beryllia is the standard for this kind of application. Now, other materials such as Aluminium Nitride and Silicon Carbide are being developed to replace beryllia because of its reputation as a poisonous product. 

Aluminium nitride is an interesting and useful ceramic material. On the other hand, it is somewhat problematic, mostly due to its reactivity with water. Because of this the important issue in the aqueous processing of AIN powder is the control of the hydrolysis reactions. 

K. W. Chew, A. Sellinger, R.M. Laine, processing aluminium nitride-silicon carbide composites via polymer infiltration and pyrolysis of polymethyl silane, a precursor to stoichiometric silicon carbide, J. Am. Ceram. Soc., 82, 857-866 (1999)... 

Zientara D, Bucko MM, Lis J (2007) Dielectric properties of aluminium nitride-y-AlO materials. J Eur Ceram Soc 27 4051-4054... 

Mainly alumina and SiC particles have been considered, however other ceramic particles including zirconia, mullite, silicon nitride, silica, cordierite, chromia, titania, boron nitride, aluminium nitride and thoria particles have also been used [2,6,8-10,15,17-19,25]. 

This range of materials may be oxide ceramics usually aluminium oxide, mixed ceramics consisting of aluminium oxides and a titanium hardened material and silicon nitride ceramics. 

H.J. Choi, J.G. Lee, and Y.W. Kim, Oxidation Behaviour of Liquid-Phase Sintered Silicon Carbide with Aluminium Nitride and Rare-Earth Oxides (RerOs, where Re=Y, Er, Yb), J.Am.Ceram.Soc., 85(9), 2281-86 (2002). 

A class of variants of the ceramics related to alumina is based on the ternary Al-O-N system, which forms 13 different compounds, some of which are polyt)rpes of aluminium nitride based on the wurtzite structure. 

SiAION (silicon aluminium oxynitride) ceramics for engineering applications can be synthesised from aluminosilicates by carbothermal reduction and nitridation (CRN), in which a mixture of the aluminosilicate with carbon is fired in nitrogen at 1400 C. Composites of potassium aluminosilicate geopolymers with graphite, when fired for lOhr under these conditions, have been found to produce predominantly p-SiAlON (Figure 10) by a reaction such as ... 

MUL 95] MULLOT J., LECOMPTE J.P., JARRIGE J., High thermal conductivity aluminium nitride substrates with Y2O3 or YF3 additives . Fourth Euro Ceramics, Part II, Ed. C. Galassi, p. 235-241,1995. 

Jarrige, J., Joyeux, T., Lecompte, J. P, Labbe, J. C. (2007). Influence of oxygen on the joining between copper and aluminium nitride. Journal of the European Ceramic Society, 27, 337-341. doi 10.1016/j.jeurceramsoc.2006.02.028. 

Catalysts can be metals, oxides, sulfides, carbides, nitrides, acids, salts, virtually any type of material. Solid catalysts also come in a multitude of forms and can be loose particles, or small particles on a support. The support can be a porous powder, such as aluminium oxide particles, or a large monolithic structure, such as the ceramics used in the exhaust systems of cars. Clays and zeolites can also be solid catalysts. 

Campbell, G.H., Rtihle, M., Dagleish, B.J. and Evans, A.G. Whiskers toughening a comparison between aluminium oxide and silicon nitride toughened with silicon carbide , J. Am. Ceram. Soc., 73[3] (1990) 521-530. 

The traditional or conventional ceramics are generally in monolithic form. These include bricks, pottery, tiles and a variety of art objects. The advanced or high-performance monolithic ceramic materials represent a new and improved class of ceramic materials where, frequently, some sophisticated chemical processing route is used to obtain them. Generally, their characteristics are based on the high quality and purity of the raw materials used. Examples of these high-performance ceramics include oxides, nitrides, carbides of silicon, aluminium, titanium and zirconium, alumina, etc. 

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