scholarly journals Anisotropy analysis of low cement concrete by ultrasonic measurements and image analysis

2016 ◽  
Vol 48 (1) ◽  
pp. 57-70 ◽  
Author(s):  
Sanja Martinovic ◽  
Milica Vlahovic ◽  
Jelena Majstorovic ◽  
Tatjana Volkov-Husovic
Keyword(s):  
Image Analysis ◽  
Thermal Shock ◽  
High Alumina ◽  
Cement Concrete ◽  
Structural Anisotropy ◽  
Ultrasonic Measurements ◽  
Water Quench ◽  
Different Temperatures ◽  
Shock Resistance ◽  
Quench Test

The analized material was high alumina low cement castable sintered at three different temperatures. Influence of initial material anisotropy on the thermal shock resistance as well as changes of anisotropy level during the thermal shock were studied. Water quench test was used as an experimental method for the thermal stability testing. Surface anisotropy was analysed by image analysis and structural anisotropy using ultrasonic measurements. The results pointed out that the highest homogeinity and the lowest surface and structural anisotropy was for the samples sintered at 1600?C. Surface anistoropy had prevailing infuence on behavior of material during the thermal shock, but the structural anisotropy should not be neglected.

scholarly journals Influence of the damage level during quenching on thermal shock behavior of low cement castable

2010 ◽  
Vol 42 (2) ◽  
pp. 211-219 ◽  
Author(s):  
S. Martinovic ◽  
J. Majstorovic ◽  
V. Vidojkovic ◽  
T. Volkov-Husovic
Keyword(s):  
Image Analysis ◽  
Thermal Shock ◽  
Young Modulus ◽  
High Alumina ◽  
Strength Deterioration ◽  
Damage Level ◽  
Ultrasonic Measurements ◽  
Water Quench ◽  
Thermal Shock Behavior ◽  
Quench Test

In the recent decades, the use of unshaped monolithic refractories has been increasing greatly because of their significant advantages over other shaped refractory bricks of the same class. A low cement high alumina castable was synthetised and sintered at 1300?C in order to investigate thermal and mechanical properties, as well as thermal shock behavior. The water quench test was applied as an experimental method for thermal stability testing. Modification of the water quench test was performed by additional monitoring of the samples behavior during the water quench test such as implementation of image analysis and ultrasonic measurements. The image analysis program was applied on samples in order to measure the level of surface damage before and during the water quench test. Ultrasonic measurements were performed with the aim to measure the Young modulus of elasticity during the testing. Strength deterioration of the samples was calculated by the model based on ultrasonic velocity changes during the water quench test. The influence of monitoring the damage level before and during the quench experiment and its influence on thermal shock behavior will be discussed.

scholarly journals Thermal shock properties of glass-ceramics synthesized from a glass frit

2017 ◽  
Vol 49 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Mira Cocic ◽  
Branko Matovic ◽  
Milica Posarac ◽  
Tatjana Volkov-Husovic ◽  
Jelena Majstorovic ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Glass Ceramics ◽  
Glass Frit ◽  
Test Image ◽  
X Ray ◽  
Ultrasonic Measurements ◽  
Water Quench ◽  
Shock Resistance ◽  
Quench Test

In this study, the behavior of glass-ceramics synthesized from a glass frit of FFW (Final Flotation Waste) originated from the RTB Bor Company was investigated. Thermal shock resistance was monitored in order to assess the possibility of application of such waste material. Thermal shock of the samples was conducted using water quench test. Image analysis and ultrasonic measurements were used as nondestructive methods for quantification of thermal shock damage at the surface and in the bulk of the specimens. Phase composition of samples was determined by X-ray powder diffraction (XRPD). The degradation level of samples was about 43 % after 20 cycles of water quench tests. The results pointed out that glass-ceramic material exhibited good thermal shock resistance.

Water Quench Test for Thermal Shock Resistance of Porous Ceramics

2003 ◽  
Vol 2003 (0) ◽  
pp. 701-702
Author(s):  
Akihiko SUZUKI ◽  
Toshio SAKUMA ◽  
Nagatoshi OKABE ◽  
Masahiro ASAYAMA ◽  
Takuma MAKINO ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Porous Ceramics ◽  
Water Quench ◽  
Shock Resistance ◽  
Quench Test

scholarly journals Thermal shock resistance of ceramic fibre composites characterized by non-destructive methods

2008 ◽  
Vol 2 (2) ◽  
pp. 115-119 ◽  
Author(s):  
M. Dimitrijevic ◽  
M. Posarac ◽  
R. Jancic-Heinemman ◽  
J. Majstorovic ◽  
T. Volkov-Husovic ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Young Modulus ◽  
Test Surface ◽  
Composite Ceramics ◽  
Fibre Composites ◽  
Water Quench ◽  
Before And After ◽  
Shock Resistance ◽  
Non Destructive ◽  
Quench Test

Alumina based ceramic fibres and alumina based ceramic were used to produce composite material. Behaviour of composite ceramics after thermal shock treatments was investigated. Thermal shock of the samples was evaluated using water quench test. Surface deterioration level of samples was monitored by image analysis before and after a number of quenching cycles. Ultrasonic measurements were done on samples after quench tests. Dynamic Young modulus of elasticity and strength degradation were calculated using measured values of ultrasonic velocities. Strengths deterioration was calculated using the non-destructive measurements and correlated to degradation of surface area and number of quenches. The addition of small amount of ceramic fibres improves the strengths and diminishes the loss of mechanical properties of samples during thermal shock experiments.

Preparation of Yttria with Elongated Grains and Micro-Pores

2011 ◽  
Vol 197-198 ◽  
pp. 425-428
Author(s):  
Wen Bin Dai ◽  
Xin Li Wang ◽  
Peng Zhao ◽  
Jing Kun Yu
Keyword(s):  
Solid Solution ◽  
Thermal Shock ◽  
Grain Growth ◽  
Thermal Shock Resistance ◽  
Soaking Time ◽  
Water Quench ◽  
Shock Resistance ◽  
Quench Test

The effect of 1mol% calcia additive on sintering of yttria was investigated, and a yttria with elongated grains and micro-pores was developed in present work. The results showed that in calcia added samples heated at 1600°C, calcia contained yttria solid solution grains were formed and distributed among pure yttria grains. With the prolonging soaking time, they were concentrated into rod- or plate-like elongated grains and some of them were embedded into pure coarse yttria grains. Furthermore, in calcia added samples, grain growth was much faster and lots of micro-pores were left in coarse pure yttria grains. Water quench test revealed that thermal shock resistance of calcia added sample was greatly improved by elongated grains and micro-pores.

Thermal Shock Resistance of Cordierite-Mullite Refractory Composites

2005 ◽  
Vol 290 ◽  
pp. 260-263 ◽  
Author(s):  
Zdeněk Chlup ◽  
Ivo Dlouhý ◽  
Aldo Roberto Boccaccini ◽  
D.N. Boccaccini ◽  
Cristina Leonelli ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Fracture Behaviour ◽  
Notched Specimen ◽  
Composite Systems ◽  
Microstructural Damage ◽  
Component Systems ◽  
Water Quench ◽  
Mullite Refractory ◽  
Shock Resistance ◽  
Points Of View

The design of composite materials leads to the development of multi-component systems where each constituent has a specific function in the material, from technological and/or application points of view. Examples of such composite systems are the cordierite-mullite refractory materials investigated in this contribution. Two different commercially available compositions were selected for evaluation of the influence of microstructure on fracture behaviour under thermal shock conditions. The materials were exposed to water-quench tests from 1250°C and subsequently the fracture toughness was evaluated using the chevron notched specimen technique. The results were compared to those obtained on as-received materials. Microstructural damage was also studied applying fractographic techniques with the aim to gain knowledge on the thermal shock damage mechanisms acting in the materials.

Thermal Shock Resistance of Silicon Nitrides Using an Indentation-Quench Test

2004 ◽  
Vol 85 (1) ◽  
pp. 279-281 ◽  
Author(s):  
Seung Kun Lee ◽  
James D. Moretti ◽  
Michael J. Readey ◽  
Brian R. Lawn
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Silicon Nitrides ◽  
Shock Resistance ◽  
Quench Test

Thermal shock behavior of alumina based refractories: fracture resistance parameters and water quench test

1999 ◽  
Vol 38 (5) ◽  
pp. 372-378 ◽  
Author(s):  
T Volkov-Husović ◽  
R.M Jančić ◽  
M Cvetković ◽  
D Mitraković ◽  
Z Popović
Keyword(s):  
Thermal Shock ◽  
Fracture Resistance ◽  
Water Quench ◽  
Thermal Shock Behavior ◽  
Quench Test

Using the Image Analysis Program for Prediction of Thermal Stability Behavior of Refractory Specimen

2005 ◽  
Vol 492-493 ◽  
pp. 561-566 ◽  
Author(s):  
Tatjana Volkov-Husović ◽  
R.M. Jančić ◽  
D. Mitraković
Keyword(s):  
Thermal Stability ◽  
Image Analysis ◽  
Mechanical Characteristics ◽  
Laboratory Procedure ◽  
Stability Behavior ◽  
Water Quench ◽  
Before And After ◽  
Quench Test ◽  
Thermal Stability Of ◽  
Refractory Specimen

Most important properties which are usually measured for refractories are work temperature and thermal stability. Thermal stability of the alumina based samples was measured using a standard laboratory procedure, the water quench test ( JUS.B.D.8.319.). ImagePro Plus Program was used for image analysis of microphotographs of the samples before, during and after water quench test. Changes at the surface before, and after cycling were given. Mechanical characteristics were considered such as compressive strength, and dynamic modulus of elasticity. It was measured by resonance frequency measurements, as well as ultrasonic velocity. In this work the correlation between microstructure, ulatrasonic velosity and strength on thermal stability of the sample were investigated. The obtained results were used for validation of the model to predict the thermal stability of the refractory specimen.

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