Experimental Study of Dynamic Strength of Aluminum Oxide Based Fine-Grained Ceramics Obtained by Spark Plasma Sintering
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PERIMENTAL STUDY OF DYNAMIC STRENGTH OF ALUMINUM OXIDE BASED FINE-GRAINED CERAMICS OBTAINED BY SPARK PLASMA SINTERING A. M. Bragov, V. N. Chuvil’deev, N. V. Melekhin∗ ,
UDC 536.421.5
M. S. Boldin, V. V. Balandin, A. V. Nokhrin, and A. A. Popov
Abstract: Spark plasma sintering and a standard sintering method are used to manufacture ceramic plates with a diameter of 30 mm from aluminum oxide powder with a fraction size approximately equal to 3 μm. Dynamic strength of the ceramics obtained is studied. Dynamic loading is carried out by a hardened steel impactor. It is shown that energy dissipation in a material obtained using spark plasma sintering is substantially larger than that in a material produced using standard sintering, which means that it is more resistant to dynamic loads. Keywords: alumina, oxide ceramics, spark plasma sintering, ballistic tests, hardness, crack resistance. DOI: 10.1134/S0021894420030220 INTRODUCTION Aluminum oxide is one of the most widespread ceramic materials used for protection from different dynamic impacts. This is due to a combination of high hardness, crack resistance, chemical inertness, and cheapness of this material and composites based on it with the addition of reinforcing particles SiC, ZrO2 , TiC, TiN, MgO, etc. [1–5]. The dynamic properties of aluminum oxide based ceramics and composites have been studied in a large number of works [1–14]. It is noted in [6–14] that improving the protective properties of ceramic materials is a relevant applied problem. A promising way to increase the dynamic strength of structural ceramics is to form a homogeneous finegrained structure in them. It is shown in [6, 9, 10, 14] that a decrease in the grain size in ceramics down to values smaller than 10 μm can significantly increase the dynamic strength (resistance to penetration of an elongated impactor at a collision velocity in a range of 500–800 m/s) and improve the protective properties of aluminum based ceramics. It is possible to simultaneously increase a dynamic strength and obtain a ceramic material with a given grain size using a high-rate packing method known as spark plasma sintering (SPS) [15]. An important feature of SPS that distinguishes it from other consolidation methods is high accuracy in controlling the sintering parameters and a possibility to vary them over a wide range directly in the sintering process. This allows one to change density and grain structure in many ceramic materials [16], including aluminum based ceramics [17–20].
Lobachevsky State University of Nizhny Novgorod National Research University, Nizhny Novgorod, 603950 Russia; [email protected]; [email protected]; ∗ [email protected]; [email protected]; [email protected]; [email protected]; [email protected]. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 61, No. 3, pp. 207–214, May–June, 2020. Original article submitted September 18, 2019; revision submitted November 1, 2019; accepted for publication November 25, 2019. ∗ Corresponding author. 494
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