Effect of additions of metal submicron particles on properties of alumina matrix composites
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BUILDING ADVANCED MATERIALS VIA PARTICLE AGGREGATION AND MOLECULAR SELF-ASSEMBLY
Effect of additions of metal submicron particles on properties of alumina matrix composites Enrique Rocha-Rangel1,a) , Juan López-Hernández1, Carlos A. Calles-Arriaga1, Wilian J. Pech-Rodríguez1, Eddie N. Armendáriz-Mireles1, José A. Castillo-Robles1, José A. Rodríguez-García1 1
Universidad Politécnica de Victoria, Parque Científico y Tecnológico de Tamaulipas, Ciudad Victoria, Tamaulipas 87138, México Address all correspondence to this author. e-mail: [email protected]
a)
Received: 27 February 2019; accepted: 30 April 2019
Ceramic–metal composites are an important group of materials that have gained interest recently because of their peculiar properties. There have been numerous studies on the reinforcement of alumina through the incorporation of various ductile metals in it. However, these studies have been limited to determining the effect of the addition of metals on the mechanical properties of ceramics, without determining the effect of these metal additions on other physical properties of the resulting composite. In this way, in agreement with the obtained results, we have that because of the conductive nature of metals, there is a considerable decrease in the electrical resistivity of alumina, mainly when copper is added to it. However, in terms of optical performance, alumina matrix composites showed significant changes in absorbance in the visible spectra. The addition of iron, titanium, and yttrium enhanced the absorbance of alumina, whereas manganese addition significantly decreased the optical absorption.
Introduction Alumina ceramics are very attractive engineering materials because they present remarkable properties such as low density combined with high hardness, high strength, refractoriness, thermal and chemical stability, and wear resistance. Although their low fracture toughness limits their potential applications due to small imperfections in their structure, cracks grow rapidly, causing them to fail catastrophically when they are in service. Faced with this situation, many researchers have taken on the task of reinforcing alumina-based ceramics by adding ductile metal particles in their matrix [1]. Thus, in order to improve the fracture toughness of alumina, a good number of studies have been carried out in which various metals have been added to the alumina matrix [2, 3, 4, 5, 6, 7, 8, 9, 10]. These studies have achieved interesting results in which it was established that the reinforcement mechanism is due to the deflection of cracks when they move forward and collide with a metallic particle [11, 12, 13]. It has also been determined that the size and distribution of the reinforcing particles have a strong influence on the mechanical properties of the resulting composite.
ª Materials Research Society 2019
In addition, different processing methods and techniques have been used to produce these composite materials and include powder techniques involving either hot or cold uniaxial pressing, hot is
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