摘要:
The present disclosure concerns composite material having improved strength at elevated temperatures. The composite material comprises a matrix of an aluminum alloy (comprising, in weight percent, Si 0.05 - 0.30, Fe 0.04 - 0.6, Mn 0.80 - 1.50, Mg 0.80 -1.50 and the balance being aluminum and unavoidable impurities) as well as particles of a filler material dispersed within the matrix. The matrix can optionally comprise Cu and/or Mo. In some embodiments, the composite material comprises, as a filler material, B 4 C as well as an additive selected from the group consisting of Ti, Cr, V, Nb, Zr, Sr, Sc and any combination thereof. The present disclosure also provides processes for making such composite materials.
摘要:
A process for producing metallic carbide particulate reinforced aluminum alloy matrix composite comprises the following steps: a) providing a molten aluminum matrix maintained at a temperature in the range of 750°C to 1200 °C; b) pneumatically injecting a metal containing compound into said molten matrix to form an alloy melt; c) injecting a hydrocarbon compound into said melt, to generate in-situ carbon for reacting with said melt, to obtain molten alloy containing metallic carbide particulate; and d) casting and solidifying said molten alloy.
摘要:
Earth-boring tools for drilling subterranean formations include a particle-matrix composite material comprising a plurality of silicon carbide particles dispersed throughout a matrix material, such as, for example, an aluminum or aluminum-based alloy. In some embodiments, the silicon carbide particles comprise an ABC-SiC material. Methods of manufacturing such tools include providing a plurality of silicon carbide particles within a matrix material. Optionally, the silicon carbide particles may comprise ABC-SiC material, and the ABC-SiC material may be toughened to increase a fracture toughness exhibited by the ABC-SiC material. In some methods, at least one of an infiltration process and a powder compaction and consolidation process may be employed.
摘要:
A method for forming a nanocomposite material and articles made with the nanocomposite material are presented. The method comprises providing a molten material (12); providing a nano-sized material, the nano-sized material being substantially inert with respect to the molten material (12); introducing the nano-sized material into the molten material (12); dispersing the nano-sized material within the molten material (12) using at least one dispersion technique selected from the group consisting of agitating the molten material (12) using ultrasonic energy to disperse the nano-sized material within the molten material (12), introducing at least one active element into the molten material (12) to enhance wetting of the nano-sized material by the molten material (12), and coating the nano-sized material with a wetting agent to promote wetting of the molten metal on the nano-sized material; and solidifying the molten material (12) to form a solid nanocomposite material, the nanocomposite material comprising a dispersion of the nano-sized material within a solid matrix.
摘要:
An arc-melting method is taught for the formation of metallic-second phase composite materials. The method involves the formation of an intermediate composite material comprising a relatively high loading of second phase particles dispersed in a metal matrix. This intermediate material is then combined with an additional amount of metal and arc-melted to form a final composite comprising a lower loading of the second phase particles dispersed in a final metallic matrix. The final metallic matrix may be comprised of a metal, metal alloy, or intermetallic, while the second phase particles may comprise ceramic materials such as borides, carbides, nitrides, silicides, oxides or sulfides.
摘要:
A method for preparing cast composite materials of nonmetallic carbide particles in a metallic matrix, wherein the particles are roasted and then mixed into a molten metallic alloy to wet the molten metal to the particles, and the particles and metal are sheared past each other to promote wetting of the particles by the metal. The particles are roasted in air or other source of oxygen to remove the carbon from the near-surface region of the particles and to produce an oxide surface diffusion barrier, resulting in a reduction of carbide formation in the molten matrix. The mixing occurs while minimizing the introduction of gas into the mixture, and while minimizing the retention of gas at the particle-liquid interface. Mixing is done at a maximum temperature whereat the particles do not substantially chemically degrade in the molten metal during the time required for processing, and casting is done at a temperature sufficiently high that there is no solid metal present in the melt.
摘要:
L'invention concerne un procédé de fabrication d'une pièce en un matériau composite Al/Al 3 B 48 C 2 comprenant une matrice en aluminium dans laquelle sont dispersées des particules d'un carbure mixte de formule chimique Al 3 B 48 C 2 . Le procédé comprend les étapes suivantes: a) la mise en place d'une poudre de formule chimique AlB 2 dans la cavité d'un creuset en graphite; b) la fermeture de la cavité par un élément en graphite; c) le chauffage du creuset à une température au moins égale à 960°C et inférieure ou égale à 1400°C pour obtenir la formation de précipités du carbure mixte de formule chimique Al 3 B 48 C 2 dans de l'aluminium liquide; d) le refroidissement du creuset pour solidifier l'aluminium liquide; e) l'élimination du creuset; moyennant quoi on obtient la pièce en matériau composite Al/Al 3 B 48 C 2 .
摘要翻译:本发明涉及一种制造由Al / Al3B48C2复合材料制成的零件的方法,该材料包括其中分散有化学式Al 3 B 48 C 2的混合碳化物的颗粒的铝基体。 该方法包括以下步骤:a)将化学式AlB2的粉末置于石墨坩埚的空腔中; b)用石墨元件封闭空腔; c)在至少等于960℃且小于或等于1400℃的温度下加热坩埚,以获得液态铝中化学式Al 3 B 48 C 2的混合碳化物的析出物的形成; d)冷却坩埚以使液态铝固化; e)从坩埚中取出; 由此得到由Al / Al3B48C2复合材料制成的部件。
摘要:
Use of Ca in metal matrix composites (MMC) allows for incorporation of small and large amounts of ceramic (e.g. rutile Ti0 2 ) into the metal (Al, or its alloys). Calcium remains principally out of the matrix and is part of a boundary layer system that has advantages for integrity of the MMC. Between 0.005 and 10 wt.% calcium (Ca) may be included, and more than 50wt.% of rutile has been shown to be integrated. Rutile may therefore be used to reduce melt loss due to calcium from an aluminum or aluminum alloy melt.