آخرین محصولات
Boron-Carbide and Boron Rich Rhobohedral Based Transistors …
The present invention relates to the fabrication of a boron carbide/boron semiconductor devices. The results suggest that with respect to the approximately 2 eV band gap pure …
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Boron carbide composite bodies, and methods for making same
This invention relates to metal-ceramic composite bodies produced by a reactive infiltration process, e.g., reaction-bonded bodies. More particularly, the invention relates to reaction-bonded silicon carbide having a boron carbide filler or reinforcement, and to ballistic armor structures produced from reaction-bonded silicon carbide bodies.
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WO1990009348A1
The invention is a method of producing boron carbide powder of submicrometer size by passing a particulate reactive mixture of a boric oxide source and a carbon source through a hot zone such that substantially all of the particles are separately and individually heated at a heating rate of at least 70°C/second to a sufficient temperature and for a sufficient …
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Carl H. McMurtry Inventions, Patents and Patent Applications
Abstract: The invention provides a silicon carbide fiber carrying an aluminum nitride coating between about 1 and about 15 micrometers thick. The AlN coating serves as a debond layer which improves the fracture toughness of composite materials in which the coated fiber is a reinforcement phase. ... is composed of finely divided boron …
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PROTECTIVE LAYER FOR PECVD GRAPHITE BOATS
The PECVD boat as claimed in claim 1, wherein the hard-material coating has a multilayer construction comprising boron carbide and at least one of titanium carbide and titanium nitride. Description: The invention relates to a protective layer for PECVD boats made of graphite for receiving wafers and for transporting same in or through PECVD ...
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WO2009070131A3
The invention relates to pure boron carbide (B4C) production method comprising subjecting saccharose (table sugar) to dehydration reaction with the sulphuric acid in the presence of boric acid, obtaining the precursor (12C+48B) comprising carbon and boron as a result of the said dehydration reaction, subjecting the obtained precursor to the heat …
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US8697259B2
The invention relates to a boron carbide composite material comprising diamond particles and boron carbide, the composite material having a porosity of less than 2 percent by volume. The invention further relates to a method for manufacturing such materials, the method including coating a plurality of diamond particles with boron carbide, combining …
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CN112625602A
The invention relates to the technical field of coatings, and discloses a heat-resistant antioxidant powder coating which comprises the following raw materials in parts by weight: 20-30 parts of resin, 5-7 parts of barium sulfate, 7-9 parts of boron carbide, 15-25 parts of pigment, 7-9 parts of silicon carbide, 3-5 parts of curing agent, 2-4 parts of flatting agent, …
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Boron carbide fiber reinforced articles (Patent) | DOE Patents
The present invention is directed to the fabrication of boron carbide articles having length-to-diameter or width ratios greater than 2 to 1. The process of the present invention is practiced by the steps comprising hot pressing boron carbide powder into article segments or portions in which the segments have a length-to-diameter or width …
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Carbide | Chemical Compound, Hardness & Uses | Britannica
Carbides are prepared from carbon and an element of similar or lower electronegativity, usually either a metal or a metal oxide, at temperatures of 1,000–2,800 °C (1,800–5,100 °F). Almost any carbide can be prepared by one of several general methods. The first method involves direct combination of the elements at high temperatures (2,000 ...
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US Patent for Boron carbide based materials and process for the
Disclosed is a method for fabricating a solid article from a boron carbide powder comprising boron carbide particles that are coated with a titanium compound. Further disclosed herein are the unique advantages of the combined use of titanium and graphite additives in the form of water soluble species to improve intimacy of mixing in …
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Boron Carbide Composite Materials
The invention relates to a boron carbide composite material comprising diamond particles and boron carbide, the composite material having a porosity of less than 2 percent by volume. The invention further relates to a method for manufacturing such materials, the method including coating a plurality of diamond particles with boron …
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CN103072988A
The invention relates to a method for recycling boron carbide in sapphire grinding waste slurry. The method comprises the following steps: mixing waste slurry and a viscosity reducer according to the mass percent of 2:10-6:10 and stirring to obtain suspending liquid, wherein the grinding solution comprises the main component of oily …
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Building Stronger Body Armor
Boron carbide, dubbed "black diamond," is a man-made material, which ranks second below another synthetic material called cubic boron nitride for hardness. Unlike cubic boron nitride, however, boron …
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BORON CARBIDE FIBER PRODUCTION
Finally, in accordance with the present invention, an amine-treated fiber as described may be heated in an inert atmosphere at a temperature of from about 2,000°C to about 2,350°C, whereupon a complex reaction occurs rapidly within the fiber and boron carbide is produced, accompanied by the dissipation of N, O and H and considerable loss of ...
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Norbide HotPressed Boron Carbide
*Composition code: B = boron; C = free graphite; B 4 C = boron carbide **Knoop 0.1 kg load ***TestBar Size: 3 x 4 x 45mm (0.118" x 0.157" x 1.772") Saint-Gobain Ceramics application engineers can assistyou with the design of cost-effective high performance components for your specific need. Norbide® HotPressed Boron Carbide Property …
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Boron Carbide
3.18.3.1 Fabrication Five typical fabrication methods of boron carbide are shown in Table 4. 5 The carbothermic reduction of B2 O 3 is the primary industrial procedure. First, an …
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Silicon carbide | Discovery & Modern Uses | Britannica
Properties and applications. Until the invention of boron carbide in 1929, silicon carbide was the hardest synthetic material known. It has a Mohs hardness rating of 9, approaching that of diamond. In addition to hardness, silicon carbide crystals have fracture characteristics that make them extremely useful in grinding wheels and in abrasive paper …
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Method of manufacturing a boron carbide film on a substrate
In the method of forming the boron carbide film on the substrate according to this invention, after the boron carbide film is formed by plasma spraying, the film is heated at a high temperature of 1100˜2400° C. in a non-oxidative atmosphere, whereby the boron oxide reacts with the remaining carbon to generate boron carbide and carbon monoxide ...
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Plasma-chemical method of producing boron carbide
FIELD: chemical industry. SUBSTANCE: invention relates to production of polycrystalline boron carbide. Boron carbide is produced by plasma-chemical synthesis in a high-frequency discharge inside reactor containing electrodes made in the form of substrates for the precipitation of boron carbide. Synthesis is carried out at a discharge power of 500 …
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US4605440A
Hard, tough, lightweight boron-carbide-reactive metal composites, particularly boron-carbide-aluminum composites, are produced. These composites have compositions with a plurality of phases. A method is provided, including the steps of wetting and reacting the starting materials, by which the microstructures in the resulting composites can be …
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Building Stronger Body Armor
143 Shares A close-up view of boron carbide crystals. Dharmesh Patel/Texas A&M Engineering According to ancient lore, …
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Boron carbride/silicon carbide ceramics
Description. BACKGROUND. This invention relates to ceramics and more particularly to non-oxide ceramics. Boron carbide (B 4 C) has a high melting temperature, exceptional hardness, and low specific gravity. However, boron carbide has a low oxidation resistance and can not be used above 600° C. in an oxidizing atmosphere.
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Patents by Inventor Jean-Alain Laurin
Abstract: The present disclosure provides additives capable of undergoing a peritectic reaction with boron in aluminum-boron carbide composite materials. The additive may be selected from the group consisting of vanadium, zirconium, niobium, strontium, chromium, molybdenum, hafnium, scandium, tantalum, tungsten and combination …
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US8536080B2
One embodiment of the invention is directed to a direct method of forming boron carbide fiber from boron carbide (B 4 C) powder. In another exemplary embodiment, the carbon produced during the carbonization of cellulose (C 6 H 10 O 5 ) n may be used as the sintering aid for boron carbide fiber, as shown below.
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Boron Carbide Composite Materials
The invention relates to a boron carbide composite material comprising diamond particles and boron carbide, the composite material having a porosity of less than 2 percent by volume. The invention further relates to a method for manufacturing such materials, the method including coating a plurality of diamond particles with boron carbide, combining …
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Application of Boron Carbide Ceramics in Body Armor
Application of Ceramic Armor. Some of the most common applications of ceramic armor, if which boron carbide is one are: It is used in ballistic armor protection, such as transport aircraft, land vehicles, helicopters, body armor (ESAP and SAPI), and AC-130U gunships armor protection. Marine-grade ceramic armor is used in medium and smaller boats.
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Method of manufacturing boron carbide armor tiles
More specifically, FIG. 3 illustrates the first step of the present invention, namely, providing a precompacted billet 26 of boron carbide powder in the requisite configuration for manufacture of a boron carbide ceramic armor tile using hot pressing techniques. It will be recognized that because the billet of FIG. 3 is made from a precompacted ...
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Method of making boron carbide articles
In accordance with this invention, a shaped article of boron carbide may be made by heating boron carbide of a required degree of purity, and particularly the material described in the Ridgway Patent No. 1,897,214, to a temperature at which it will melt or soften and shaping the material directly in a mold under a suitable pressure, while ...
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Role of carbon nanotubes in the ballistic properties of boron carbide
Boron carbide powder (−600 Mesh, Boron Carbide India Pvt. Ltd) was hot-pressed into tile shape in a graphite resistance furnace at conditions similar to that given in Ref. [32]. The tiles were ground and machined in hexagonal and rectangular shapes of thickness 6.25 ± 0.1 mm as shown in Fig. 1. Download : Download high-res image (284KB)
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