Abstract:
A ceramic plugging paste useful to make plugs having through holes (partial plugs) in a ceramic honeycomb filter in which the plugging paste is comprised of a ceramic particulate and fluid carrier, wherein the ceramic particulate has at least 90% by number of the particulates being less than 50 micrometers and the fluid carrier is present in an amount sufficient such that the plugging paste is fluid enough to be inserted into a ceramic honeycomb channel and be retained in said channel without any other support other than the walls of the honeycomb defining the channel. Such a paste may be easily injected in the same manner as regular pastes. Such pastes and methods advantageously realize plugs having a through hole resulting in honeycomb filters having low pressure drop while still retaining effective particulate filtration.
Abstract:
Fiber reinforced composites are made by infusing a mass of reinforcing fibers with a resin composition. The resin composition includes a liquid phase and a small amount of dispersed filler particles. The dispersed filler particles are small in at least one dimension, compared to the diameter of the reinforcing fibers. The resin composition is subsequently hardened to form the composite. This method produces a composite having a very smooth surface. Print-out of the reinforcing fiber is greatly reduced without the need to mask it through the application of thick coatings or additional layers of material.
Abstract:
The present invention relates to a reactive formulation used to make a polyurethane foam which is particularly suited for use in under the hood vehicle applications which require sound deadening and vibration management and a process to make said foam. In particular, the polyurethane foam is made from a reactive formulation comprising an A side comprising (i) one or more organic isocyanate and a B side comprising (ii) one or more isocyanate-reactive component, (iii) a carbon nanofiller; and (iv) one or more additional component selected from a catalyst, a blowing agent, a cell opener, a surfactant, a crosslinker, a chain extender, a filler, a colorant, a pigment, an antistatic agent, reinforcing fibers, an antioxidant, a preservative, or an acid scavenger.
Abstract:
A ceramic honeycomb structure comprised of at least two separate smaller ceramic honeycombs that have been adhered together by a cement comprised of inorganic fibers and a binding phase wherein the smaller honeycombs and fibers are bonded together by the binding phase which is comprised of an amorphous silicate, aluminate or alumino-silicate glass and the cement has at most about 5% by volume of other inorganic particles. The cement may be made in the absence of other inorganic and organic additives while achieving a shear thinning cement, for example, by mixing oppositely charged inorganic binders in water together so as to make a useful cement for applying to the smaller honeycombs to be cemented.
Abstract:
Fiber reinforced composites are made by infusing a mass of reinforcing fibers with a resin composition (11). A thin sheet (6) of nano-sized monofilaments (7) is applied on at least one major surface of a fiber mass. The resin composition (11) is subsequently hardened to form the composite. This method produces a composite having a very smooth surface. Printout of the reinforcing fiber is greatly reduced without the need to mask it through the application of thick coatings or additional layers of material.
Abstract:
Ceramic honeycomb assemblies are made from ceramic honeycomb sections arranged sequentially in an axial direction. The plugging patterns of the cells in the various sections are varied so that a portion of a fluid entering the assemblies can pass through upstream section(s) of the assembly without being filtered. One or more downstream sections capture particulate matter that has passed through the upstream sections without being filtered. This design reduces “ring-off” cracking, and high filtration capacity, with little increase in pressure drop during operation.
Abstract:
A porous ceramic body useful for making particulate filters is comprised of acicular mullite grains bound together by a ceramic grain boundary phase, wherein said porous acicular mullite body has a bulk carbon content from 0.005% to 10% by weight of the body. The porous body may be made by forming a mixture of mullite precursors (e.g., alumina and silica) and a compound that is inorganic carbon (graphitic or amorphous), inorganic compound that contains carbon (e.g., metal carbide) or an organic compound that decomposes to form inorganic carbon or an inorganic compound that contains carbon and heating in an atmosphere containing fluorine to form the acicular mullite body and removing the fluorine.
Abstract:
Skins and/or adhesive layers are formed on a porous ceramic honeycomb by applying a layer of a cement composition to a surface of the honeycomb and firing the cement composition. The cement composition contains inorganic filler particles, a carrier fluid and a clay material rather than the colloidal alumina and/or silica materials that are conventionally used in such cements. The cement compositions resist permeation into the porous walls of the ceramic honeycomb. As a result, lower temperature gradients are seen in the honeycomb structure during rapid temperature changes, which results in an increased thermal shock resistance.
Abstract:
The present invention provides thermosetting resin pre-impregnated or infused fiber materials or prepregs comprising a thermosetting resin mixture and a fiber material component of a heat resistant fiber, such as carbon fiber, having an areal weight of from 500 to 3,000 g/m2 having a coating of from 0.5 to 4 phr of a latent, particulate curative or solid curative, preferably, dicyandiamide, wherein the prepregs are infused with a thermosetting resin mixture comprising (a) at least one liquid epoxy resin, and (b) a hardener and/or a catalyst, as well as methods of making the same. The prepregs of present invention enables the simple provision of lightweight composites having consistent resin cure throughout.
Abstract:
The present invention provides thermosetting resin pre-impregnated or infused fiber materials or prepregs comprising a thermosetting resin mixture and a fiber material component of a heat resistant fiber, such as carbon fiber, having an areal weight of from 500 to 3,000 g/m2 having a coating of from 0.5 to 4 phr of a latent, particulate curative or solid curative, preferably, dicyandiamide, wherein the prepregs are infused with a thermosetting resin mixture comprising (a) at least one liquid epoxy resin, and (b) a hardener and/or a catalyst, as well as methods of making the same. The prepregs of present invention enables the simple provision of lightweight composites having consistent resin cure throughout.