37 results about "Calcium hexaboride" patented technology

A metal matrix composite was fabricated by adding particles of calcium hexaboride to a metal of aluminum, magnesium or titanium and their alloys. The resulting metal matrix composite is light weight has improved strength, increased elastic modulus and reduced thermal coefficient of expansion, thus making the metal matrix composite more useful in industry. A metal matrix composite is also formed by mixing particles of aluminum, magnesium, titanium or combinations thereof with particles of silicon lexaboride, calcium hexaboride, silicon tetraboride, calcium tetraboride or combinations thereof. The blended particles are processed according to powder metallurgical techniques to produce a metal matrix composite material.

A powder boronizing composition comprising:a. 0.5 to 4.5 wt % of a boron source selected from B4C, amorphous boron, calcium hexaboride, borax or mixtures thereof;b. 45.5 to 88.5 wt % of a diluent selected from SiC, alumina or mixtures thereof;c. 1.0 to 20.0 wt % of an activator selected from KBF4, ammonia chloride, cryolite or mixtures thereof; andd. 10.0 to 30.0 wt % of a sintering reduction agent selected from carbon black, graphite or mixtures thereof.

The invention relates to a preparation method of refractory metal (Ti, Zr, Hf, V, Nb,Ta and Cr) borides, and belongs to the field of inorganic chemistry. The existing industrially prepared refractorymetal borides are mainly synthesized by a carbon heat reduction method or a direct element synthesis method; the method has the problems of low product purity, great granularity, high equipment cost and the like. The method uses calcium hexaboride (CaB6) powder and refractory metal oxides as raw materials; corresponding refractory metal borides are produced through high-temperature reaction undercertain conditions; the high-temperature reaction products are subjected to acid soaking to remove soluble impurities; through filtering, rinsing and drying, the high-purity refractory metal borides are obtained. The method belongs to a novel method for synthesizing refractory metal boride powder. Compared with other methods, the method has the advantages that the reaction product purity is high;the cost is low; the method is flexible.

The application discloses a self-shielded surfacing flux-cored welding wire and a preparation method, which belong to the field of welding materials. The flux-cored welding wire includes a wire skin material and a flux, the flux is filled in the welding wire skin material, and the flux includes the following components by weight: 30-40% of chromium carbide, 15-25% of ferromanganese, and 7.5-9.5% of ferrotantalum %, tungsten carbide 3‑8%, calcium hexaboride 1‑5%, graphite 6‑8%, cerium oxide 0.5‑1%, rare earth magnesium ferrosilicon alloy 10‑15%, fluorspar 3‑5%, silica 4‑ 7%, Li 2 CO 3 1-2%, marble 2-3%; the filling rate of the flux in the welding wire skin material is 30-45%. In this application, by selecting each component in the flux and optimizing the addition amount of each component, the hardness and wear resistance of the surfacing metal can be significantly improved, so that the service life of the repair material can be prolonged, and the mechanical properties of the surfacing metal in special fields can be satisfied. Require.

An antiaging agent for high-temperature resistant infrared coatings and a preparation method thereof, characterized in that: a. In parts by weight, 20-50 parts of silicon dioxide, 15-32 parts of silicon hexaboride, 15-32 parts of hexaboron Calcium chloride, 1-8 parts of boron trioxide, 3-12 parts of borosilicate glass are mixed and then added to the mixing tank for pre-mixing for 5-30 minutes; b. Then the mixture is added to the fluidized bed jet mill for shaping and mixing, and the classifier 1200~2300r / min, to obtain mixed powder with an average particle size of 0.1~4μm; c. The mixed powder is placed in a high-temperature furnace, heated to 850~1100℃ at 2~7℃ / min, kept for 1~3h, and sintered with furnace cooling d. The sintered material is crushed to an average particle size of 0.5-5mm, added to a fluidized bed jet mill for ultra-fine, and the classifier is 2400-3000r / min to obtain a high-temperature-resistant infrared coating with an average particle size of 0.1-2μm. Aging agent. The invention has simple composition and convenient preparation steps; it is stable and has good high-temperature infrared radiation ability, anti-oxidation ability and anti-washing ability in high-temperature complex atmosphere.

The invention discloses a high-strength and high-conductivity refining agent for smelting a chromium-zirconium-copper alloy. The refining agent comprises a covering component and a purifying component, wherein the purifying component comprises calcium hexaboride, fluorotitanate, fluoborate, chlorine metal salt and rare earth. The invention further discloses an application method for the high-strength and high-conductivity refining agent for smelting the chromium-zirconium-copper alloy. According to the refining agent and the application method thereof, the cooperation function of the covering component and the purifying component is adopted so that the good impurity removal and purification effect on chromium-zirconium-copper alloy melt can be achieved, in addition, the oxidation burning loss in the smelting process can be effectively avoided, and therefore the strength and the conductivity of the material can be improved, and no pollution can be caused to the copper alloy melt.

The invention relates to a high-temperature-resistant paint film for a diamond vacuum reduction and sintering basket. The paint film is prepared from, by weight, 12-15 parts of aluminum oxide fine powder, 5-10 parts of dititanium nitride fine powder, 8-10 parts of calcium hexaboride fine powder, 10-15 parts of chromium trioxide fine powder, 2-4 parts of graphite, 15-20 parts of asphalt and 30-40 parts of gasoline. The high-temperature-resistant paint film prepared through the method and the sintering basket coated with the high-temperature-resistant paint film and subjected to high temperature treatment are resistant to high temperature not lower than 1200 DEG C, are durable and can meet normal use conditions of artificial diamond, and adhesion between metal sintering baskets in the high-temperature state can be effectively prevented. Besides, no influence is caused on characteristics and quality of diamond products, the use effect is very good in hoisting and forking in automatic production, and smooth automatic production can be well ensured.