Abstract: A chromia-magnesia based refractory product made up of fused chromia-magnesia grains bonded by an in situ formed chromia-magnesia bond. The product is very dense and especially suitable when used to process molten materials which involve coal slag.

Abstract: A porous refractory object, more particularly a porous silicon carbide igniter is shown, the interconnecting pores and passageways of its body being filled with sub-micron sized silicon carbide particles deposited therein from a slurry coated on the surface of the object, which particles are subsequently oxidized at least on the surface and within the passages or pores in the subjacent surface portion of the body, to provide a protective coating of silica within the pores and on the surfaces of the object to preclude oxidation of the internal phases of the body of the object in oxidizing atmospheres.

Abstract: A saddle type pipe support means attachable to a base. The support is comprised of an inverted V-shaped member, a sling support located at the vertex of said inverted V-shaped member for engagement of a pipe to the support, and a clamping means for securing the pipe to the sling. The leg elements of the inverted V-shaped member include a foot on each element for engagement with and fastening to a floor or base.

Abstract: A dry ramming refractory cement composed principally of coarse dense alumina grains, silicon metal powder, calcined alumina and sodium hexametaphosphate, and optionally one or more materials from the group including silicon carbide, fused white alumina, chromia, periclase, kyanite, graphite and cryolite.

Abstract: A method for making low porosity resin bonded product containing abrasive grams by preheating the abrasive grain mix prior to pressing and curing to a temperature within a range to just soften or partially liquidy the resin and which does not cure it. The heating is done with dielectric heating field and then the heated mix is cold pressed in a mould to the desired density, and the resin heat cured to produce the finished product.

Abstract: The invention is an electrophoretic casting process which produces highly dense green castings with residual liquid e.g. water below 7%, and which eliminates excessive liquid and electrode degradation. This is accomplished by careful selection of slip viscosity, utilization of an impervious casting mold set-up in which only a minor part of the mold is conducting, application of a varying voltage cycle, and moving one electrode relative to the other.

Abstract: A sealant strip is provided having a soft, resilient synthetic foamed resin core, preferably having a pressure sensitive adhesive coating on at least one of two of the opposed sides of the core and thin preferably silicone rubber sealing layers cured in situ on the two remaining surfaces of the core. The strip is adapted for adhesive attachment to and compression between structural members, with the core supporting the edges of the sealing layers in contact with the opposed surfaces of the structural elements between which the strip has been compressed.

Abstract: A grinding wheel is mounted on a tapered spindle by die moulding in which bond material is injection moulded into a central hole in the wheel about the end of the spindle but is prevented from entering the space between the die liner and tapered spindle by a seal at the end of the die liner.

Abstract: The present invention relates to abrasive articles such as grinding wheels which employ organic binders and are improved by the use of certain oils or with the use of long chain aliphalic monhydroxy alcohols or long chain alkylated phenols alone or mixed with particular oils as dust depressants or dampening agents used with the conventional plasticizers. These dampening agents prevent "balling", minimize dusting and produce a more durable abrasive article.

Abstract: Dense, essentially flawless, complex refractory or metal shapes are formed by preparing a casting slip of fine refractory or metal powder wherein the slip liquid preferably contains 0.1 to 10% by weight of a hydrogen bond forming compound, casting the slip, freezing the cast slip, removing the solid form from the mold, drying, and finally firing to sinter the refractory or metal particles.

Abstract: A reaction bonded silicon oxynitride product having a density of 85 to 95% of theoretical density, a degree of density heretofore not attainable by sintering or reaction bonding. Such high densities are attained by nitriding, in an oxygen free atmosphere ultra fine silicon and ultra fine silica in the presence of certain reaction aids. The particle size of the silicon powder must be at least as fine as about 3 microns and the silica as fine as about 0.3 microns.

Abstract: High density, sintered refractory articles composed of: 60 to 98% by weight of boron carbide and 2 to 40% by weight of silicon carbide, and 0 to 10% by weight of aluminum. As a result of the composition, products with densities in excess of 94% of theoretical can be produced by cold pressing followed by a pressureless heat treatment.

Abstract: The invention is a phenol-formaldehyde resin bonded grinding wheel which has grinding characteristics like that of shellac bonded grinding wheels. This soft, mild grinding action results from the basic phenol-formaldehyde resin initially containing from 0.5 to 2.5% by weight of hexamethylenetetramine, when used in conjunction with a material such as liquid one-stage phenol-formaldehyde resin, or furfural as the bond pick-up agent.

Abstract: An adhesive composition which, in the preferred aspects of the invention, is a partially cured reaction product of the composition in the form of a dried, preformed film that is heat-activatable, is provided comprising in admixture a poly-functional active hydrogen containing component consisting of, in combination, a hydroxyl terminated polyurethane polyester having a hydroxyl number no greater than about 15 and a member containing at least difunctional active hydrogen having an active hydrogen equivalent weight of at least about 27 and less than about 500, a component having available free isocyanate groups, and a fourth component such as a chlorinated aliphatic hydrocarbon, a chlorinated aromatic hydrocarbon, or an alkylated polystyrene.

Abstract: Porous refractory articles resistant to degradation at high temperatures for example by oxygen, chlorine and the like, are composed of a main body of a porous sintered carbide, nitride, boride or silicide which is coated with silicon nitride or silicon oxynitride. The coating is not only on the surface of the main body of the porous refractory article, but also penetrates the article to a depth at least greater than the depth of the surface pores.

Abstract: A progressing cavity fluid motor for driving a drill bit for deep drilling tools is described. Such a motor is mounted on a drill string and is powered by a fluid such as drilling mud. The pump includes a housing, a stator with female helical threads within the housing and a rotor with male helical threads mounted inside of the stator. The drill bit is connected to the rotor. In the present invention the rotor has a threaded surface which is formed of an elastically deformable sleeve supported by a carrier shaft. The sleeve is mounted on the carrier shaft in such a manner as to prevent rotation between the two so that the sleeve drives the shaft by positive engagement between these two elements. Means are arranged for introducing a pressure inside of the elastically deformable sleeve for expanding the sleeve radially outwardly.

Abstract: A process for making cloth backing for coated abrasive articles is disclosed wherein a backing material is coated on its front side, with a liquid thermosetting resin, in such a manner that the resin does not permeate the interstices of the cloth. As a result, the cloth retains most of its original pliability when incorporated in the finished coated abrasive article. A back sizing, of for example glue, may also be applied in the same manner to provide a coated abrasive backing material which is both front sized and back sized but which still possesses most of its original pliability.

Abstract: An adhesive composition which, in the preferred aspects of the invention, is a partially cured reaction product of the composition in the form of a dried, preformed film that is heat-activatable, is provided comprising in admixture a poly-functional active hydrogen containing component consisting of, in combination, a hydroxyl terminated polyurethane polyester having a hydroxyl number no greater than about 15 and a member containing at least difunctional active hydrogen having an active hydrogen equivalent weight of at least about 27 and less than about 500, a component having available free isocyanate groups, and a fourth component such as a chlorinated aliphatic hydrocarbon, a chlorinated aromatic hydrocarbon, or an alkylated polystyrene.

Abstract: A process for fabricating high density aluminum modified boron carbide compositions comprising the steps of blending specific quantities of powdered boron carbide and powdered aluminum together with a small quantity of temporary organic binder, preforming this mixture to the desired shape with high pressure at room temperature, followed by final densification of the finished product at a temperature below the sintering temperature of boron carbide and at a pressure as low as 500 psi. The resulting compositions are near theoretical density and possess a degree and type of strength which make them well suited as protective armor against penetration by ballistic projectiles.

Abstract: A gas impermeable hollow silicon carbide body is formed by slip-casting two separate hollow silicon carbide bodies, the two separate bodies are then cemented together by means of a silicon carbide slip and then the joined pieces are fired at a temperature sufficiently elevated to recrystallize the cast bodies and to form a recrystallized joint between the two pieces, thereafter the body is subjected to a silicon atmosphere to deposit sufficient additional silicon in the body to provide a structure which is essentially impermeable to gases.