摘要:
A ceramic fiber composite structure particularly suitable for use as a hot gas cleanup ceramic fiber composite filter and method of making same from ceramic composite material has a structure which provides for increased strength and toughness in high temperature environments. The ceramic fiber composite structure or filter is made by a process in which a continuous ceramic fiber is intimately surrounded by discontinuous chopped ceramic fibers during manufacture to produce a ceramic fiber composite preform which is then bonded using various ceramic binders. The ceramic fiber composite preform is then fired to create a bond phase at the fiber contact points. Parameters such as fiber tension, spacing, and the relative proportions of the continuous ceramic fiber and chopped ceramic fibers can be varied as the continuous ceramic fiber and chopped ceramic fiber are simultaneously formed on the porous vacuum mandrel to obtain a desired distribution of the continuous ceramic fiber and the chopped ceramic fiber in the ceramic fiber composite structure or filter.
摘要:
Ceramic composites containing weak interfacial boundaries included for the purposes of providing avenues for crack deflection with a resulting toughening of a ceramic body. Weak interfacial boundaries are created between constituents of the composite, such as matrix phases and any continuous and/or particulate reinforcements, and tungstate, molybdate, tantalate, and niobate compounds of the general formula ABO4. For tungstate and molybdate compounds of the general formula ABO4, B represents tungsten or molybdenum, and A represents a divalent cation. For tantalate and niobate compounds of the general formula ABO4, B represents tantalum or niobium, and A represents a trivalent lanthanide series cation. The ABO4 tungstate, molybdate, tantalate, and niobate compounds may exist as barrier phases between the matrix and the reinforcements of the composite, or the ceramic body may contain discrete particulates, laminae, fibers, or whiskers of the ABO4 tungstate, molybdate, tantalate, and niobate compounds. In a preferred embodiment, the reinforcing phases of the composite is a continuous single or polycrystalline fiber; however, particulate or whisker reinforcements will also benefit by being separated from the matrix phases by an interphase of an ABO4 tungstate, molybdate, tantalate, or niobate. A non-brittle material may also be fabricated by creating multilayer laminar composites containing alternating lamina of the ABO4 compound and a second phase.
摘要:
A method of densifying glass-composite structures using a superplastically deformed foil to partially encapsulate a glass-composite part and a part holding die. The die and part are contained in a rigid box held in a press. The foil is deformed over the die and part. Heat and pressure are applied to the die and part, through the rigid box, to soften the glass matrix of the part and to cause the glass to flow into the voids of the part.
摘要:
A method for coating ceramic fibers such as Al.sub.2 O.sub.3 fibers includes immersing the Al.sub.2 O.sub.3 fibers in a polyelectrolyte solution. After the polyelectrolyte is allowed to adsorb on the fibers, the unabsorbed polyelectrolyte is washed from the fibers with a distilled water. The fibers are then deposited in an oxide solution such as SnO.sub.2. The SnO.sub.2 is allowed to adsorb on the fibers, and then the unabsorbed SnO.sub.2 is washed from the fibers with the distilled water. The fibers are then sintered at a temperature ranging from 400.degree. C. to 1200.degree. C.
摘要翻译:用于涂覆陶瓷纤维如Al 2 O 3纤维的方法包括将Al 2 O 3纤维浸入聚电解质溶液中。 将聚电解质吸附在纤维上之后,用蒸馏水从纤维中洗涤未吸收的聚电解质。 然后将纤维沉积在诸如SnO 2的氧化物溶液中。 使SnO 2吸附在纤维上,然后用蒸馏水从纤维中洗涤未吸收的SnO 2。 然后将纤维在400℃至1200℃的温度下烧结。