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At this time, the standard temperature cone bent to the test cone at the same time The representative temperature is the fire resistance of the test cone(brown fused aluminum oxide manufacturers). There are two methods to determine the load softening temperature of refractory products: differential heating method and non differential heating method, it shows the structural strength of products under the same service conditions(20 mesh aluminium oxide grit). 

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The basic factor determining the refractoriness is the chemical mineral composition and distribution of the material(brown aluminum oxide 80 grit). The refractoriness of refractories is usually indicated by the cone number of standard temperature measuring cone. The load applied on the sample is 0.2MPa(white fused alumina abrasives). When the heating rate is less than 1000 ℃, it is 4-5 ℃ / min and more than 1000 (when it is 5-10 ℃ / min), will seriously reduce the refractoriness of products.

Refractoriness refers to the resistance of refractories to high temperature without load without melting(white aluminum oxide 80 grit). The refractoriness is the basis of judging whether the material can be used as refractories. According to the international organization for standardization, inorganic non-metallic materials with a fire resistance of more than 1500 ℃ are defined as refractories(white corundum price). The refractoriness cannot be used as the service temperature of refractories.

The meaning of refractoriness is different from melting point. High temperature compression creep is commonly used(brown aluminium oxide grit). The significance of creep measurement of refractories lies in that all kinds of impurities, especially those with strong flux effect(brown alumina abrasive). Therefore, the main way to improve the refractoriness of refractories is to take appropriate measures to ensure and improve the purity of raw materials, with a diameter of 50 mm.

The Chinese standard (GB / t7322-1997) and the international standard (iso528) stipulate the refractory test method(best alumium oxide for glass blasting). The key point is to make the tested material into a truncated triangular cone with the same shape and size as the standard temperature cone(white fused aluminum oxide refractory). Under the specified heating conditions, compare it with the bending of the standard temperature cone, until the top of the test cone is bent to contact the chassis.

The load softening temperature of refractories refers to the temperature at which refractories bear constant load and produce deformation under the condition of continuous temperature rise(wilson abrasive). It shows the ability of refractory products to resist both high temperature and load, to some extent(brown fused alumina micro). The main factors affecting the load softening temperature of refractory products are their chemical mineral composition and microstructure.

Increasing the purity of raw materials, reducing the content of low melting matter or flux, increasing the forming pressure, and making high density bricks bad can significantly improve the load softening temperature of products(arc fused alumina). According to international standard (1s01893) and Chinese standard (GB / t5989-1998), the load softening temperature of refractory products is measured by differential temperature rise method(white aluminium oxide blasting media).

The principle is to heat the cylinder sample under the specified constant pressure load and heating rate until the sample produces the specified compression deformation(white aluminium oxide 180/220), record the deformation of the sample during heating, and measure the corresponding temperature when the specified deformation variable is reached(aluminum oxide blasting grit). The sample used is a cylinder with a central hole, a height of 50 mm and a central hole diameter of 12-13 mm.