Abstract: To provide an alumina-based fibrous mass having a high areal pressure and is usable as a holding material for an exhaust gas cleaners and a production process thereof; the alumina-based fibrous mass has a chemical composition containing an Al2O3 in an amount of 70% or more and less than 90% and having a total pore volume of 0.0055 mL/g or less.

Abstract: To provide an alumina-based fibrous mass having a high areal pressure and is usable as a holding material for an exhaust gas cleaners and a production process thereof; the alumina-based fibrous mass has a chemical composition containing an Al2O3 in an amount of 70% or more and less than 90% and having a total pore volume of 0.0055 mL/g or less.

Abstract: A metal matrix composite was fabricated by adding particles of calcium hexaboride to a metal of aluminum, magnesium or titanium and their alloys. The resulting metal matrix composite is light weight has improved strength, increased elastic modulus and reduced thermal coefficient of expansion, thus making the metal matrix composite more useful in industry. A metal matrix composite is also formed by mixing particles of aluminum, magnesium, titanium or combinations thereof with particles of silicon lexaboride, calcium hexaboride, silicon tetraboride, calcium tetraboride or combinations thereof. The blended particles are processed according to powder metallurgical techniques to produce a metal matrix composite material.

Abstract: Thermoplastic fibers of different melting points are present in an aqueous slurry of refractory fibers, binder and flocculant. The slurry is passed through a screen to form a wet body which is heated to dry the body and melt the thermoplastic fibers to bind the refractory fibers together.