Definition and testing of high temperature load softening creep
The load softening temperature refers to the temperature at which refractory products deform under constant compressive load under specified heating conditions. It indicates the product's resistance to the simultaneous effects of high temperature and load, and to a certain extent, indicates the structural strength of the product under similar service conditions. It also indicates that at this temperature, the product has obvious plastic deformation, and is an important quality indicator of performance.
Influencing factors
The level of load softening temperature of refractory products mainly depends on their chemical mineral composition and microstructure. When the crystalline phase forms a network skeleton, the load softening temperature of the material is high; when it is dispersed in the liquid phase in an isolated island shape, its load softening temperature is determined by the content of the liquid phase and its viscosity. For example, the more liquid phase or the smaller the viscosity, the lower the load softening temperature. The interaction between the crystalline phase and the liquid phase will also change the quantity and properties of the liquid phase. The density of the product also has a certain influence on the level of load softening temperature. The phase composition of silica bricks is mainly tridymite crystals and cristobalite crystals. Tridymite is a spearhead-shaped twin crystal that interweaves with each other during rotation to form a network skeleton. There is only 10% to 15% of the liquid phase, and its viscosity is high. Tridymite crystals are not dissolved and destroyed by the presence of liquid phase to destroy the skeleton, but only when it is close to its melting point, the skeleton is destroyed by melting, causing the softening and collapse of the brick. Therefore, the load softening temperature of silica brick is high, the difference between the initial softening temperature and the final temperature is only 10~20℃, and the difference with its refractoriness is only 60~70℃, sometimes or less. The phase composition of magnesia brick is mainly periclase crystals, which are cemented together by binders, so the load softening temperature of magnesia brick depends on the properties of the binder. The binder in magnesia brick is generally a low melting point silicate phase such as calcium forsterite and magnesium rhodonite. Although the melting point phase of periclase crystal exists and its viscosity is low at high temperature, magnesia brick shows a low load softening temperature, which is more than 1000℃ different from its refractoriness.
Ultra-high temperature load softening creep tester RUL706 (high temperature load softening measurement) measures the deformation behavior of refractory ceramic products under elevated temperature conditions and a certain load. CIC (compression creep test) refers to the shrinkage rate of refractory material samples under high temperature and constant temperature for a long time and under a certain load.
Standards that the equipment meets:
The ultra-high temperature load softening creep testing machine mainly adopts the differential-heating method/non-differential-heating method, which meets the test standards of YB/T370, GB/T5989, GB/T5073, GB/T7320, ISO1893, and ISO3187. It is used to test the load softening temperature, compressive creep, and thermal expansion performance of various refractory products and amorphous materials.
For specific technical parameters of the ultra-high temperature load softening creep testing machine, please consult the supplier or manufacturer. This equipment can also add expansion test function, or increase the number of test samples, etc.
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