The effect of adding stainless steel needle fibers to different castables
Adding stainless steel needle fibers to the refractory castable can enhance the toughness of the castable. And it can enhance the wear degree and mechanical impact of the castable, and more importantly, improve the thermal shock stability of the castable.
The temperature critical point of adding stainless steel needle fibers to the castable is at 1350℃. If the temperature exceeds 1350℃, the stainless steel needle fibers will not play their due role. Like some castables used in places exceeding 1400℃, there is no need to add stainless steel. No matter how much needle fiber is added, it will not have any effect, but it will increase the cost of the castable.
Like cement rotary kiln, white ash rotary kiln, pellet rotary kiln, the front and rear kiln mouths can all use refractory castables with stainless steel needle fiber. Because the front and back kiln mouths have many castings, refractory bricks cannot be used for masonry. Use stainless steel needle fibers. Refractory castables are not only resistant to tension and compression, but also resistant to fatigue and abrasion.
Not only the stainless steel needle fiber is added to the refractory castable, but also an appropriate amount of stainless steel needle fiber can be added to the plastic and ramming material to improve the crack resistance and peeling resistance. And in the curing process, adding stainless steel needle fiber can prevent the linear shrinkage of the castable.
However, the amount of stainless steel needle fiber added should not be too large, which will cause the internal change of the castable. After the castable is sintered at high temperature, the expansion coefficient will increase and the thermal conductivity will also increase. Especially during construction, excessive addition of stainless steel needle fiber will cause unnecessary troubles for construction.
There are many kinds of refractory castables with stainless steel needle fibers, and there are many grade categories, high aluminum plus stainless steel needle fibers, corundum plus stainless steel needle fibers, mullite plus stainless steel needle fibers, silicon carbide stainless steel needles Fiber, these are composite refractory castables. It's just adding different proportions under different circumstances.
However, the amount of addition is a technical field, but the stainless steel needle fiber should not be added if the temperature exceeds 1350°C, which is not only ineffective. On the contrary, the increase in cost also adds inconvenience to the construction
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