Aluminum-4 mass%Copper/Alumina Composites Produced from Aluminum Copper and Rice Husk Ash Silica Powders by Powder Forging

Abstract

This research demonstrated simple but effective process to produce Al-4 mass%Cu/Al 2 O 3 composites, by powder metallurgy method. The starting powders were aluminum, copper, and rice husk ash silica. Processing was by sintering at 650 C for 3.6 ks, hot forging of sintered billet at 600 C under 660 MPa pressure, followed by heat treatment. Hot forging of sintered billet induced plastic deformation of the matrix as well as fractured the porous silica, thus created ultimate contact between the two phases. The following heat treatment produced alumina, which was the reinforcement phase, by chemical reaction between fractured rice husk ash silica and aluminum matrix. The fabricated composite containedand -alumina, and elemental silicon in matrix of aluminum solid solution. Addition of copper facilitated sintering by formation of liquid phase, as well as yielding a matrix material which can be strengthened by precipitation hardening. Maximum hardness obtained was 44 HRA, for composite material using 15 vol% rice hush ash silica. Peak hardness of the matrix was in range of 130-136 HV, after aging for 28.8 to 43.2 ks.

Review on the physicochemical treatments of rice husk for production of advanced materials

“…It is also expected that the SiC whiskers and particles in the preforms will remain intact and will preserve their properties in the composites.It is intended that by the reaction with Si, the addition of Mo gives place to MoSi 2 formation, which would be advantageous to the overall properties of the composites. This is because MoSi 2 is a less brittle phase compared with Si and has a high melting point (2030 ºC), thus favoring the high-temperature performance of the composite [88].A summary of different fabrication routes and types of ceramicand metal-matrix composites, starting from rice husk is presented in Table 3 [83][84][85][89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106].…”

Materiales vitrocerámicos del sistema MgO-Al₂O₃-SiO₂ a partir de ceniza de cáscara de arroz

“…La ceniza de cáscara de arroz está compuesta fundamentalmente por sílice que, dependiendo de las condiciones de combustión, se encuentra en forma amorfa o cristalina. Por su composición, la CCA se utiliza como fuente de sílice en la industria siderúrgica [1] y como material puzolánico en la industria del cemento [2,3]. En el sector de los materiales cerámicos, en los últimos años se han realizado diferentes estudios de valorización de residuos industriales en pastas cerámicas [4][5][6] y en concreto, se ha investigado el uso de esta ceniza como materia prima secundaria en la fabricación de productos de loza [7], pigmentos [8], vidriados [9,10], ladrillería [11] En este trabajo se muestran los resultados de un estudio cuyo objetivo es la valorización de la ceniza de cáscara de arroz como materia prima en la obtención de materiales vitrocerámicos con propiedades adecuadas para ser utilizados como materiales de construcción.…”

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

“…Worldwide, approximately 120 Mt of rice husk are produced annually, which gives rise to a global production of 21 Mt/year of RHA [35]. In general, RHA is dumped as a waste [36,37]; however, because of its composition, it may be used as a source of silica in the steel industry [38] and as a pozzolanic material for the cement industry [39,40]. In the ceramic sector, several studies have been conducted in recent M.I.…”