Properties of high-porosity materials from refractory compound fibers
A study was made of the hydraulic properties, pore sizes, pore channel tortuosity, and compressive strength of high-porosity materials from extruded titanium carbide fibers.
So far as the quantity q and itsdependence onvarious factors are concerned, the materials investigated approach wire filters atθ=40–70% and filters from nonspherical powders atθ<28–30%.
The parameters Dmax, Dhydr, andβ substantially grow with increase inθ and d, but are less strongly affected by changes in the lengthl. Dmax is not a unique characteristic of the stopping power of a porous fiber material. The greater the surface roughness of the fibers, the higher is the value ofβ at a constant value of Dmax.
The variation ofσp withθ is quite accurately described by the equation σp=σb(1-θ)m. The values of the exponent m (m=3–5) for the materials investigated approach those for sintered powder materials.
The variation ofσp as a function of fiber diameter is almost linear, the actual degree of the influence exerted by d onσp being determined by the porosityθ. The fiber length affectsσp up to a certain value ofl, above whichσp remains virtually unchanged.
KeywordsCompressive Strength Fiber Length Dmax Titanium Carbide Refractory Compound
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