32 results about "Reaction bonded silicon carbide" patented technology

The present invention relates to a composite material and the method of making same ,which comprises a CVD diamond coating applied to a composite substrate of ceramic material and an unreacted carbide-forming material of various configurations and for a variety of applications. One example of the composite material is a composite of SiC and free silicon metal known as Reaction-Bonded Silicon Carbide. Several examples of applications of the invention include: 1) heads or disks for conditioning polishing pads, including pads used in Cheniical-Mechanical-Planarization, 2) cutting and dressing tool inserts and tips, 3) heat spreaders for electronic devices, and 4) wear components including mechanical seals and pump seals.

A composite body produced by a reactive infiltration process that possesses high mechanical strength, high hardness and high stiffness has applications in such diverse industries as precision equipment and ballistic armor. Specifically, the composite material features a boron carbide filler or reinforcement phase, and a silicon carbide matrix produced by the reactive infiltration of an infiltrant having a silicon component with a porous mass having a carbonaceous component. Potential deleterious reaction of the boron carbide with silicon during infiltration is suppressed by alloying or dissolving boron into the silicon prior to contact of the silicon infiltrant with the boron carbide. In a preferred embodiment of the invention related specifically to armor, good ballistic performance can be advanced by loading the porous mass or preform to be infiltrated to a high degree with one or more hard fillers such as boron carbide, and by limiting the size of the largest particles making up the mass. The instant reaction-bonded silicon carbide (RBSC) composite bodies surpass previous RBSC's as armor materials, and in this capacity approach the ballistic performance of current carbide armor ceramics but with potentially lower cost manufacturing methods, e.g., infiltration techniques.

A chemical-mechanical polishing / planarization pad conditioner body made from diamond-reinforced reaction bonded silicon carbide, with diamond particles protruding or “standing proud” of the rest of the surface, and uniformly distributed on the cutting surface. In one embodiment, the diamond particles are approximately uniformly distributed throughout the composite, but in other embodiments they are preferentially located at and near the conditioning surface. The tops of the diamond particles can be engineered to be at a constant elevation (i.e., the conditioner body can be engineered to be very flat). Exemplary shapes of the body may be disc or toroidal. The diamond particles can be made to protrude from the conditioning surface by preferentially eroding the Si / SiC matrix. The eroding may be accomplished by electrical discharge machining or by lapping / polishing with abrasive.

The present invention relates to non-contaminating bonding materials for segmented silicon carbide liners in fluidized bed reactors. The invention also discloses segmented silicon carbide liners, in particular segmented silicon carbide liners for use in fluidized bed reactors for the production of polysilicon-coated granular materials, and methods for making and using said segmented silicon carbide liners method. A non-contaminating adhesive material for joining the silicon carbide segments is also disclosed. One or more of the silicon carbide segments may be constructed from reaction bonded silicon carbide.

The invention proposes a silicon carbide ceramic composite molding process based on light-curing prototype pyrolysis, and its basic principle is the combination of light-curing rapid prototyping technology and reaction sintering silicon carbide technology. The main process method is to use liquid photosensitive resin as the raw material for the molding of the part, and make a prototype through the photocuring rapid prototyping process to provide an organic template for the shape and internal structure of silicon carbide ceramics, and convert it into an inorganic template through a pyrolysis process—three-dimensional carbon stand. Then carry out high-temperature siliconizing, and silicon reacts in situ on the carbon support to form silicon carbide ceramics and its composite material components. The method changes the traditional ceramic component preparation process, overcomes the shortcomings of the traditional process that it is difficult to manufacture ceramic parts with complex shapes and precise dimensions, and realizes the moldless precision manufacturing of silicon carbide ceramics.