摘要:
A multi-component or ‘composite’ inorganic fiber comprising a nano-scale contiguous collection of a plurality of packed unique phases of material randomly interspersed throughout the fiber body, without unwanted impurities, and a method for producing same. Said phases include three or more foundational chemical elements from the Periodic Table mixed together during fiber production, producing distinct material phases interspersed throughout the fiber volume.
摘要:
A ceramic matrix composite includes continuous silicon carbide fibers in a ceramic matrix comprising silicon carbide and a MAX phase compound having a chemical composition Mn+1AXn, where M is a transition metal selected from the group consisting of: Ti, V, Cr, Sc, Zr, Nb, Mo, Hf, and Ta; A is a group-A element selected from the group consisting of: Al, Si, P, S, Ga, Ge, As, Cd, In, Sn, Tl and Pb; and X is carbon or nitrogen, with n being an integer from 1 to 3.
摘要:
A multi-component or ‘composite’ inorganic fiber comprising a nano-scale contiguous collection of a plurality of packed unique phases of material randomly interspersed throughout the fiber body, without unwanted impurities, and a method for producing same. Said phases include three or more foundational chemical elements from the Periodic Table mixed together during fiber production, producing distinct material phases interspersed throughout the fiber volume.
摘要:
A method of manufacturing ceramic matrix composite objects is disclosed. The method comprises the steps of providing first and second substantially two dimensional arrangements of one or more fibre plies, and machining the first and second arrangements to predetermined configurations to form first and second preforms. The second preform is made to conform to a surface of the first preform such that at least some of the fibres of the second preform are orientated at least partially in a plane outside that defined by the fibres of the first preform, and fixed to the first preform to form a combined first and second preform. The combined first and second preform is rigidised. Ceramic matrix composite objects manufactured by this method are also disclosed.
摘要:
A novel material boron carbide high polymeric fiber fabricated from the following parts of raw materials by weight: 50-60 parts of boron carbide, 150-193 parts of high polymeric ethylene emulsion with a concentration 40%-50%, 116 parts of hydrochloric acid with a concentration 37%, 3-5 parts of antioxidant, and 7 parts of catalyst, and fabricated in a 2500-2800° C. high-temperature high-pressure furnace and then in a high temperature-resistant spinning furnace. The novel material boron carbide high polymeric fiber produced according to the present invention exhibits performances such as extremely good resistance against high temperature and low temperature, super anti-acid and anti-base performance, excellent extensibility, wear resistance and anti-impact capability, and resistance against ultraviolet and the like. The boron carbide high polymeric fiber may be used in fields such as firearms manufacture, maritime rescue, fire protection and fire fight, anti-bullet and anti-explosion armor, biochemical nuclear industry treatment, and may be extensively applied to civil field, aerospace, military fairs and national defense. The material is recyclable and pollution-free.
摘要:
A method of synthesizing mechanically resilient titanium carbide (TiC) nanofibrous felts comprising continuous nanofibers or nano-ribbons with TiC crystallites embedded in carbon matrix, comprising: (a) electrospinning a spin dope for making precursor nanofibers with diameters less than 0.5 J·Lm; (b) overlaying the nanofibers to produce a nano-fibrous mat (felt); and then (c) heating the nano-felts first at a low temperature, and then at a high temperature for making electrospun continuous nanofibers or nano-ribbons with TiC crystallites embedded in carbon matrix; and (d) chlorinating the above electrospun nano-felts at an elevated temperature to remove titanium for producing carbide derived carbon (CDC) nano-fibrous felt with high specific surface areas.
摘要:
A metal carbide ceramic fiber having improved mechanical properties and characteristics and improved processes and chemical routes for manufacturing metal carbide ceramic fiber. Metal carbide ceramic fibers may be formed via reaction bonding of a metal-based material (e.g. boron) with the inherent carbon of a carrier medium. One embodiment includes a method of making a metal carbide ceramic fiber using VSSP to produce high yield boron carbide fiber. Embodiments of the improved method allow high volume production of high density boron carbide fiber. The chemical routes may include a direct production of boron carbide fiber from boron carbide powder (B4C) and precursor (e.g. rayon fiber) having a carbon component to form a B4C/rayon fiber that may be processed at high temperature to form boron carbide fiber, and that may be subsequently undergo a hot isostatic pressing to improve fiber purity. Another route may include a carbothermal method comprising combining boron powder (B) with a precursor (e.g., rayon fiber) having a carbon component to form a B/rayon fiber, carbonizing and a chemical reaction of boron (B) and carbon (C) to form boron carbide fiber. Another carbothermal method may comprise combining boron oxide powder (B2O3) with a precursor (e.g., rayon fiber) having a carbon component to form a B2O3/rayon fiber, carbonizing and a chemical reaction of boron oxide (B2O3) and carbon (C) to form boron carbide (B4C) fiber.
摘要翻译:一种金属碳化物陶瓷纤维,其具有改进的机械性能和特性,以及用于制造金属碳化物陶瓷纤维的改进方法和化学路线。 金属碳化物陶瓷纤维可以通过金属基材料(例如硼)与载体介质的固有碳的反应结合而形成。 一个实施方案包括使用VSSP制备金属碳化物陶瓷纤维以产生高产率碳化硼纤维的方法。 改进方法的实施例允许高容量生产高密度碳化硼纤维。 化学路线可以包括从碳化硼粉末(B4C)直接生产碳化硼纤维和具有碳组分的前体(例如人造纤维),以形成可在高温下加工以形成碳化硼纤维的B4C /人造丝纤维, 然后可以进行热等静压,以提高纤维纯度。 另一种途径可以包括碳热法,其包括将硼粉末(B)与具有碳组分的前体(例如人造丝纤维)组合以形成B /人造丝纤维,碳化和硼(B)和碳(C)的化学反应, 以形成碳化硼纤维。 另一种碳热法可以包括将氧化硼粉末(B 2 O 3)与具有碳成分的前体(例如人造纤维)组合以形成B 2 O 3 /人造丝纤维,碳化和氧化硼(B 2 O 3)和碳(C)的化学反应与 形成碳化硼(B4C)纤维。
摘要:
Methods of producing continuous boron carbide fibers. The method comprises reacting a continuous carbon fiber material and a boron oxide gas within a temperature range of from approximately 1400° C. to approximately 2200° C. Continuous boron carbide fibers, continuous fibers comprising boron carbide, and articles including at least a boron carbide coating are also disclosed.
摘要:
The invention relates to a method for producing ceramic hollow fibers from nanoscale particles and to hollow fibers produced in such a manner. The inventive method is characterized in that the ceramic material has a solids content of >25% by volume, preferably >30% by volume and is processed by means of extrusion and spinning. The hollow fiber is sintered according to conventional sintering methods. A hollow fiber produced in this manner is used for metal, polymer and ceramic matrix reinforcements, for artificial organs, for microsystems technology components, for fiber optical waveguides, for ceramic membranes, for solid electrolyte in fuel cells (SOFC), for tissue engineering and for producing extremely light ceramic parts, such as heat shields or brake systems, that are subjected to temperature stresses. The inventive ceramic batch can also be processed by means of silk screening whereby resulting in the production of filigree structures over the ceramic silk screening.
摘要:
A plurality of carbide, such as silicon carbide, tungsten carbide, etc., nanofibrils predominantly having diameters substantially less than about 100 nm and a method for making such carbide nanofibrils. The method includes the steps of: heating a plurality of carbon nanotubes or nanofibrils predominantly having diameters less than about 50 nm in a reaction chamber in the presence of a gas of the form QnAm, where Q is a metal capable of forming a carbide, A is an element or radical and n and m are integers necessary to satisfy valences, such as, for example silicon monoxide, and an inert gas in a reaction vessel to a temperature substantially less than 1700 C but sufficently high to cause substantial reaction of the metal in the gas with the carbon of said carbon nanotubes or nanofibrils to form, in situ, solid carbide nanofibrils, the temperature being sufficiently low to prevent substantial fusing together of individidual ones of said carbide nanofibrils, removing at least a portion of A-based gas from said reaction chamber as said reaction progresses, and maintaining said temperature until substantially all the carbon of said nanotubes or nanofibrils has been converted into Q-based carbide.