The impact of the particle shape of organic additives on the anisotropy of a clay ceramic and its thermal and mechanical properties

Abstract

This research investigated the impact of the particle shape of organic additives on the anisotropy of a clay ceramic and its thermal and mechanical properties. The impact of the particle shape was elucidated by addition in the clay ceramic mixture of Olive Stone Flour (OSF) in the form of powder and Wheat Straw (WS) in the form of fibers. The OSF powder reduced the clay ceramic anisotropy with a formation of round shape pores during the firing process. The flexural strength of the clay ceramic was improved by 13% in case of an 8 wt% addition of OSF. On the other hand, the WS fibers increased the anisotropy by the formation of orientated pores along the extrusion plane. The thermal diffusivity of the clay ceramic was improved by 41% in the direction of the thermal gradient of the walls in case of an 8 wt% addition of WS. Hence, this study proved the particle shape of the organic additives as a useful parameter to control the anisotropy of clay ceramics and improve their thermal and mechanical properties.

The Impact of the Particle Size Distribution of Organic Additives on the Microstructure of a Clay Ceramic and Its Thermal and Mechanical Properties

“…The clay ceramic was produced from different mixtures of clay with organic additives and water. The percentage of organic additives was determined from the results of Korah et al (2016) to investigate the impact of the particle size distribution of the organic additives with yet an optimization of the percentage of addition for the thermal and the mechanical properties. Hence, the mixtures were prepared by mixing 10 kg of clay with 6% by weight of organic additives (MB 10 or MB 50 ).…”

“…The clay ceramic without organic additives has a microstructure of clay with porosity sheets. As shown by Korah et al (2016), the clay is compressed in the form of sheets during the extrusion. The air remaining in the clay mixture is then compressed as porosity sheets between the sheets of clay.…”

“…The loss of strength is a major issue for such materials. However, Korah et al (2016) have shown in a recent study that the addition of organic additives with smaller particles can result in the formation of smaller pores. These small pores resulting from the combustion of the organic additives may act as minor defects and prevent the loss of strength, as shown by Nigay et al (2017) for the small pores resulting from mineralogical transformations of the clay.…”

Investigation of ceramic brick rods with blackened materials inside

“…In spite of the clay minerals are used by thousand years their study and examination are in the focus of research in several segments of science [3][4][5][6][7][8][9][10] and industry [11][12][13][14][15][16][17][18] until today. In our days the brick and ceramic roof tiles industries are the largest user of the conventional brick clays [19][20][21][22][23][24][25][26][27][28][29]. In spite of the large production volume of brick and ceramic roof tile industries and intensive research of the conventional brick clays the drying sensitivity and material structure inhomogeneity can be reason of the scrap formations and quality defaults.…”

Investigation of mineralogical composition and technological properties of conventional brick clays

“…In our days the conventional brick clays are playing very important role in production of ceramic bricks and roof tiles [1][2][3][4][5][6][7][8][9][10][11][12][13][14] but they are wildly used also in different segments of industry [15][16][17]. Their mineralogical composition, grain size distribution, moisture and specific surface are influencing very strong not only on color and quality of the final products but on the technological properties and parameters also [18][19][20].…”