Method for controlling diameters of microcrystalline mineral fib

Details Method for controlling diameters of microcrystalline mineral fib Method for controlling diameters of microcrystalline mineral fib

1977-06-23

1978-08-01

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 62, 264 66, 264DIG19, D02G 300

Patent

active

041043952

ABSTRACT:
An improved method of making microcrystalline mineral fibers using a generally known technique of impregnating precursor organic fibers with salts of desired minerals dissolved in a solvent which is readily absorbed by the fibers, and subsequently heating and calcining the precursor fibers to leave mineral fibers comprising compounds of said impregnating salts which have diameters which in the prior art process are about half the diameter of the precursor fibers, the improvement involving controlling the diameters of the mineral fibers to reduce them greatly below the above-mentioned prior art diameters by impregnating the precursor fibers with a solution whose salt concentration is very small as compared with the high concentrations used in the prior art while taking steps to control the uniformity of the impregnation prior to calcining, the microcrystalline structures of some of the mineral fibers being improved by a final sintering step at higher temperatures than are used in the prior art.

REFERENCES:
patent: 3311689 (1967-03-01), Kelsey
patent: 3385915 (1968-05-01), Hamling
patent: 3652749 (1972-03-01), Sobel
patent: 3832451 (1974-08-01), Abrams et al.
patent: 3899555 (1975-08-01), Takao et al.

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