Effect of Thermal Shock and Additions of Clay on the Properties of a Mullite-Zirconia Ceramic

Abstract

A study is made of the effect of additions of clay and Y 2 O 3 and the temperature difference in the range 1000/20 -1500/20°C on the growth of the crystalline phases in ceramic specimens obtained by the conventional sintering of component mixtures at 1300 and 1500°C. The effects of these additions and the temperature difference on the dimensions of the crystals, elastic modulus, ultimate flexural strength s bnd , and the linear correlation between elastic modulus and s bnd are also examined. The rate of crystallization of the mullite phase and tetragonal Zr 2 O 3 and the associated increase in crystal size are greatest in specimens sintered at 1300°C and subjected to thermal shock with temperature differences of 1400/20 and 1500/20°C. Such specimens have the highest values for elastic modulus and s bnd and are characterized by the existence of a linear correlation between elastic modulus and s bnd .

RETRACTED: Mechanical properties analysis and microstructure of ceramic materials of mullite ceramic material

“…The existence of pore and microcrack may reduce the strength and creep resistance of materials, but enhances the stability of thermal shock resistance. 9 Not only does the existence of pore accommodate the volume deformation of thermal shock so as to relieve thermal stress, but also the pore plays a passivation role in the crack tip. However, only if the uniformly distributed pore is good for improving the thermal shock resistance of materials.…”

“…The corrective strain displacement matrix in 'equation' (3) can be updated using shear stiffness correction as C 1111 , C 2222 , and C 3333 in the same dimension is the same as 'equation' (9). Thus, the calculation form of C 1111 , C 2222 , and…”

“…Compared with aluminum silicate with corundum as the main crystalline phase, it has small coefficient of thermal expansion and better stability of thermal shock resistance. 6–9 However, the refractory products (such as kiln furniture, heat exchanger for industrial use) worked on the operating condition where the thermal shock resistance is highly required could not reach the operating requirement. 10–13…”

“…College of Vanadium and Titanium, Panzhihua University, Panzhihua, China it has small coefficient of thermal expansion and better stability of thermal shock resistance. [6][7][8][9] However, the refractory products (such as kiln furniture, heat exchanger for industrial use) worked on the operating condition where the thermal shock resistance is highly required could not reach the operating requirement. [10][11][12][13] In recent years, enlightened by high-performance biological materials in the natural world, the thought of imitating biological material structure to prepare high-tenacity ceramic material has been proposed in the material world.…”

Elaboration and characterization of mullite-anorthite-albite porous ceramics prepared from Algerian kaolin

“…Many works [17][18][19] have proved that porous mulliteceramics, obtained from clays, are useful refractory materials for water treatment, high-temperature applications due to their high porosity, low thermal expansion coefficient, high creep resistance and corrosion resistance. Indeed, low cost alumina-mullite composites have been produced in [20] via reactive sintering of kaolinite clay and aluminum hydroxide with flexural strength reaching 70 MPa for a sintering at 1600 °C.…”