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Spark plasma sintering of transparent aluminum oxynitride

Name
Nikita
Surname
Rubinkovskiy
Scientific organization
National Research Nuclear University "MEPhI"
Academic degree
No
Position
Postgraduate
Scientific discipline
New materials, Manufacturing technologies & Processes
Topic
Spark plasma sintering of transparent aluminum oxynitride
Abstract
We studied the possibility of spark-plasma sintering aluminum oxynitride , the optimal modes and parameters of compaction . Plotted the properties of sintered samples of the temperature , pressure and dwell time . Effect of the composition on the physical and mechanical characteristics of the samples were determined . Detected factors affecting the transparency of the finished products , and the ways that allow to obtain a high light transmittance .
Keywords
aluminum oxynitride , ALON , spark -plasma sintering, transparency, structural condition , micro-hardness , mechanical properties
Summary

Development and modernization of small arms for the army makes it necessary to develop means of body armor. In particular, improved mechanical properties required of transparent armor materials used as armored glass. The most promising material for transparent ceramic armor is based on aluminum oxynitride (ALON).

Ranked among presented in the present time of ceramics, with an average density of aluminum oxynitride has a sufficiently high strength comparable to the YAG (yttrium aluminum garnet) and cubic zirconia (stabilized zirconia). And the most important characteristic for body armor - toughness - ALON surpasses all transparent materials (including quartz glass - fused quartz, spinel and leucosapphire).

Typically made from aluminum oxynitride powder mixtures of aluminum oxide and aluminum nitride. To obtain the required mechanical and physical properties of the resulting material required density, as close as possible to the theoretical. It is also important to obtain a single-phase structure. Any inhomogeneity and second phases prevent light transmission.

To achieve the desired properties is also very important to make the preparation of raw material: powders of Al2O3 and AlN. In preparation for sintering powders may include: grinding in ball mills, and other, stirring, in a liquid dispersion and drying. Also important is the initial state and powder parameters such as particle size, purity, etc.

In this paper, attention is paid to the use of spark-plasma sintering to obtain transparent ceramics based on aluminum oxynitride, as well as the study of powder sintering cooking modes.