Properties of high-porosity materials from refractory compound fibers
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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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- 1.I. N. Frantsevich and D. M. Karpinos, (eds.) Composite Materials of Fibrous Structure [in Russian], Naukova Dumka, Kiev (1970).Google Scholar
- 2.C. Z. Carroll-Porczynski, Advanced Materials, Astex Guildford, England (1962).Google Scholar
- 3.V. A. Shpirnov, Cast Wire [in Russian], Znanie, Moscow (1966).Google Scholar
- 4.M. Yu. Bal'shin, in: Powder Metallurgy in Modern Technology [in Russian], Nauka, Moscow (1968), p. 13.Google Scholar
- 5.O. B. Belyavskaya, in: Powder Metallurgy in Modern Technology [in Russian], Nauka, Moscow (1968), p. 36.Google Scholar
- 6.A. S. Berkman, Porous Permeable Ceramics [in Russian], Gosstroiizdat, Moscow (1959).Google Scholar
- 7.R. A. Andrievskii, Porous Sintered Materials [in Russian], Metallurgizdat, Moscow (1964).Google Scholar
- 8.B. F. Shibryaev, Poroshkovaya Met., No. 4 (1963).Google Scholar
- 9.S. M. Solonin, N. P. Sleptsova, and L. I. Chernyshev, Poroshkovaya Met., No. 1 (1971).Google Scholar
- 10.G. V. Samsonov and V. E. Matsera, Powder Met. Intern.,5, No. 3, 133 (1973).Google Scholar
- 11.A. G. Kostornov and M. S. Shevchuk, Poroshkovaya Met., No. 9 (1973).Google Scholar
- 12.E. Ryschkewitch, J. Am. Ceram. Soc.,39, 65 (1953).Google Scholar