Qualify the fracture and specification in refractories and ceramics with ultrasonic velocity testing method

Especially in the last century as a result of technology development, the whole metallurgy industry leading iron-steel increased expectation from refractory materials. The research of unshaped (monolithic) refractories have gained importance, with understood of high physical, chemical and mechanical properties had not been met from the shaped refractory materials. In these researches, also the effect of high purity raw materials, the effect of chemical binders on properties were observed and it is required that application of various chemical binders for several demands. Therefore chemical binders in monolithic refractories the effect on properties and installation variety, chemical binders in monolithic refractory classifies. In the last few years furnace capacities and furnace lifetime is increased. Because of that reason it is going to be an obligation to determine the quality of used materials. Ultrasonic testing method is one the most effective method. As much as we are sure about the quality of used materials, as much as we could lower the quantity of used materials. The velocity of ultrasonic pulses travelling in a solid material depends on the density and elastic properties of castable refractories and timbers. The quality of these materials is sometimes related to their elastic stiffness so that measurement of ultrasonic pulse velocity in such materials can often be used to indicate their quality as well as to determine their elastic properties. Ultrasonic scanning is a recognized non-destructive evaluation test to qualitatively asses the homogeneity and integrity of concrete. The ultrasonic tester devices are used for measuring the velocity of ultrasonic pulses through a concrete section providing in formations on cracks, voids, strength, and giving quick estimates of dynamic modulus of elasticity on site or in the laboratory. This unit has also been modified to suit the special needs of ceramics users. In this study various chemical binders in monolithic refractories the effect of on installation and their properties are explained. Also it is explained that the effect on the installation of calcium aluminate cement which is widespread chemical binder in monolithic refractories. In experiments, it is investigated that how the amount of water added to calcium aluminate cement changes the properties of refractory materials. Also conformable amount of water adding and mechanical properties of various specimen with different amount water are determined. 3 different percentage of aggregates used in trials and analyse effect to material strength and ultrasonic velocity. There is a relationship between the ultrasonic velocity and compression strength. Ultrasonic testing was found to be an effective method for determining compression strength and water percentage (weight) in castable refractory. Since this method can be used as a quality control test for checking castable refractory while and during production, we also made 2 different fracture test with woods. With test results, it is obvious that if there is a fracture, crack or missing part in the material, it could be easily understood by getting lower pulse velocity.