Thermal and mechanical properties of cordierite, mullite and steatite produced by plasma spraying

Rohan, Pavel; Neufuss, K.; Matějíček, Jiří; Dubský, J.; Prchlík, Luboš; Holzgartner, C

doi:10.1016/j.ceramint.2003.07.004

Cited by 90 publications

(42 citation statements)

References 13 publications

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“…The mean thermal expansion coefficients of alumina, SiC and mullite are 8.4×10 −6 , 4.4×10 −6 , and 4.8× 10 −6 /K, respectively [17,18] . Since the thermal expansion coefficient of alumina is higher than those of SiC and mullite, there are tensile inter-phase microstresses in the matrix of alumina/SiC and alumina/mullite composites.…”

Section: Stress Statementioning

confidence: 99%

Prediction of fracture characteristic of particlereinforced alumina-based composites

Luo

Zhang

Wang

2008

Sci. China Ser. E-Technol. Sci.

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Residual microstresses in particle reinforced alumina/SiC and alumina/mullite composites were calculated. The results indicated that there existed a linear relation between matrix microstresses and the particle contents in the composites. The influence of stress state on crack propagating and grain boundary strengthening was analyzed. Ratios of grain boundary toughness to grain toughness of these composites were calculated in view of microstress analysis, and percentage of transgranular fracture (PTF) that increases with the microstress in the alumina matrix was then deduced. The relationship between microstructure, component, matrix microstresses, and PTF was established. Therefore, the fracture characteristic was predicted on basis of the particle content and distribution in addition to the microstructure of the composites. ceramic composite, alumina, microstress, fracture mode Particulate composites have the advantages of being isotropic, easier to be prepared and having more reliable mechanical properties compared with fiber composites and laminated composites. As a typical two-phase particulate composite, alumina/SiC nanocomposite has been intensively investigated since its excellent mechanical properties and wear resistance were discovered [1][2][3] . The tremendous improvement of properties in the ceramic composite is relevant to fracture mode transition, as generally believed, though the main reason is still in dispute [4][5][6] . An alumina/mullite composite with flexural strength and wear resistance bettered by 21% and 3 times, respectively, than monolithic alumina, was recently fabricated by utilizing the high-temperature metastable character of silicon carbide [7,8] . We found that fracture mode transition was the underlying cause.Since the thermal expansion coefficient of alumina is higher than that of mullite, the residual stress states in alumina/mullite composites are such that the second phase particles are in approximately hydrostatic compression, and there are tensile hoop stresses in the surrounding matrix [9] , the stress states in an alumina/mullite composite are similar to those of an alumina/SiC composite [10] . The tensile stresses in the alumina matrix can facilitate crack propagating in it and therefore make its toughness decrease. In the meantime, the counterforces of particle compressive stresses can be passed to the grain boundaries, resulting in toughening. The change of grain and grain boundary toughness can in turn dramatically change the crack propagating and fracture behavior of these materials [11,12] . However, change of the grain and grain boundary toughness in the composites is determined not only by residual stress but also by matrix microstructure, second phase content, size and distribution, as reported by Shi et al. [13] and Taga et al. [14] .Kim et al. [15,16] has investigated the corresponding relation between the ratio of grain boundary toughness to grain toughness and fracture mode in monolithic alumina by 2D and 3D crack propagation modeling. This method can basical...

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Section: Stress Statementioning

confidence: 99%

Prediction of fracture characteristic of particlereinforced alumina-based composites

Luo

Zhang

Wang

2008

Sci. China Ser. E-Technol. Sci.

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“…Silica-based thermal-spray coatings are rarely reported in scientific papers and their chemical, mechanical, thermal, and above all, electronic properties are not exhaustively presented in the current literature ( Ref 7,8).…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic and Mechanical Properties of Silica-Aluminosilicates Plasma Sprayed Composite Coatings

et al. 2007

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The physico-chemical and thermo-mechanical properties of aluminosilicate ceramics (high-melting point, low thermal expansion coefficient, excellent thermal shock resistance, low-density and good corrosion resistance) make this class of materials a good option for high-temperature structural applications. Al 2 O 3 -SiO 2 compounds show an excellent refractory behavior allowing a wide use as wear-resistant thermal barrier coatings, in metallurgical and glass plants and in high temperature heat exchangers. Moreover, the low values of thermal expansion coefficient and of complex permittivity allow to extend the use of this ceramic for microelectronic devices, radome for antennas and electromagnetic windows for microwaves and infrared. The present article presents the results of an extensive experimental activity carried out to produce thick aluminosilicate coatings by plasma-spray technique. The APS deposition parameters were optimized on the basis of a surface response approach, as specified by design of experiments (DoE) methodologies. Samples were tested for phase composition, total porosity, microstructure, microhardness, deposition efficiency, fracture toughness, and modulus of rupture. Finally, coatings were characterized for their particularly interesting electromagnetic properties: complex permittivity was measured at microwave frequency using a network analyzer with wave guide.

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“…The thermal conductivity of the material can be found by this experiment. The thermal resistance of the material can be found using the temperature difference, with which we can find out the effective thermal conductivity of the material [19,20]. The R-type thermocouple is used for temperature measurement.…”

Section: Experimental Analysismentioning

confidence: 99%

Analysis of Honey Comb Based Insulation for Cored Brick Heater

Sainath¹,

Kumar²,

Vineeth³

2017

SIJST

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The project deals with the insulation of a heater inside which the air is being circulated at 1800℃ and the outer shell is maintained at a temperature of less than 100℃. There are only limited materials available which can bear such high temperatures. Though some materials are available, they possess high densities: say, corundum mulliete which has higher temperature resistance but has high density. To compensate this, we use the material by making it in the shape of honeycomb. Different related studies reveal that honeycomb has more temperature drop than normal solid material. Other materials such as microsil, cera blanket, SA-516, whose thermal properties are flexible for insulation, have been used. The modelling and numerical analysis work has been carried out using various tools such as Creo 4.0, ANSYS 17.0 etc.; and, to validate the results of the numerical analysis, experimental analysis is being carried out. The experimental analysis is done by using infrared heating setup for various models by heating to specific temperatures for a certain period of time to find out the heat flow rate for the known thermal conductivity of the material. The experiment is concluded by finding out the thermal and physical properties of the material along with variations in temperature profiles that are used inside the heater for insulation by the results obtained of numerical and experimental analysis.

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Thermal and mechanical properties of cordierite, mullite and steatite produced by plasma spraying

Cited by 90 publications

References 13 publications

Prediction of fracture characteristic of particlereinforced alumina-based composites

Prediction of fracture characteristic of particlereinforced alumina-based composites

Electromagnetic and Mechanical Properties of Silica-Aluminosilicates Plasma Sprayed Composite Coatings

Analysis of Honey Comb Based Insulation for Cored Brick Heater

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