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    • 7. 发明授权
    • Method of manufacturing aluminide sheet by thermomechanical processing of aluminide powders
    • 通过铝化物粉末的热机械加工制造铝化物片的方法
    • US06660109B2
    • 2003-12-09
    • US09984871
    • 2001-10-31
    • Mohammad R. HajaligolClive ScoreyVinod K. SikkaSeetharama C. DeeviGrier FleishhauerA. Clifton Lilly, Jr.Randall M. German
    • Mohammad R. HajaligolClive ScoreyVinod K. SikkaSeetharama C. DeeviGrier FleishhauerA. Clifton Lilly, Jr.Randall M. German
    • C21D800
    • C22C33/0278B22F3/18B22F5/006B22F9/082B22F2003/248B22F2009/0824B22F2009/088B22F2998/10C21D8/0205C21D8/0236C21D8/0273C22C1/0491B22F3/115B22F3/16B22F3/24
    • A powder metallurgical process of preparing a sheet from a powder having an intermetallic alloy composition such as an iron, nickel or titanium aluminide. The sheet can be manufactured into electrical resistance heating elements having improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The iron aluminide has an entirely ferritic microstructure which is free of austenite and can include, in weight %, 4 to 32% Al, and optional additions such as ≦1% Cr, ≧0.05% Zr ≦2% Ti, ≦2% Mo, ≦1% Ni, ≦0.75% C, ≦0.1% B, ≦1% submicron oxide particles and/or electrically insulating or electrically conductive covalent ceramic particles, ≦1% rare earth metal, and/or ≦3% Cu. The process includes forming a non-densified metal sheet by consolidating a powder having an intermetallic alloy composition such as by roll compaction, tape casting or plasma spraying, forming a cold rolled sheet by cold rolling the non-densified metal sheet so as to increase the density and reduce the thickness thereof and annealing the cold rolled sheet. The powder can be a water, polymer or gas atomized powder which is subjecting to sieving and/or blending with a binder prior to the consolidation step. After the consolidation step, the sheet can be partially sintered. The cold rolling and/or annealing steps can be repeated to achieve the desired sheet thickness and properties. The annealing can be carried out in a vacuum furnace with a vacuum or inert atmosphere. During final annealing, the cold rolled sheet recrystallizes to an average grain size of about 10 to 30 &mgr;m. Final stress relief annealing can be carried out in the B2 phase temperature range.
    • 从具有金属间合金组成如粉末铁,镍或钛铝化物的粉末制备片材的粉末冶金方法。 可以将片材制造成具有改善的室温延展性,电阻率,耐循环疲劳性,耐高温氧化性,低和高温强度和/或耐高温下垂的电阻加热元件。 铁铝化物具有完全不含奥氏体的铁素体组织,并且可以以重量%计含有4至32%的Al和任选的添加物,例如<= 1%Cr,> = 0.05%Zr <= 2%Ti, = 2%Mo,<= 1%Ni,≤= 0.75%C,<= 0.1%B,≤1%亚微米级氧化物颗粒和/或电绝缘或导电共价陶瓷颗粒,≤1%稀土金属, 和/或<= 3%Cu。 该方法包括通过将具有金属间化合物组合物的粉末如通过辊压,带铸或等离子体喷涂固结形成非致密金属片,通过冷轧非致密金属片形成冷轧板,以增加 密度并减小其厚度并退火冷轧板。 粉末可以是在固结步骤之前与粘合剂进行筛分和/或共混的水,聚合物或气体雾化粉末。 在固结步骤之后,片材可以部分烧结。 可以重复冷轧和/或退火步骤以实现所需的板厚度和性能。 退火可以在真空或惰性气氛的真空炉中进行。 在最终退火期间,冷轧板再结晶至平均粒径约为10〜30μm。 最终的应力消除退火可以在B2相温度范围内进行。
    • 10. 发明授权
    • Thermomechanical processing of plasma sprayed intermetallic sheets
    • 等离子喷涂金属间板的热机械加工
    • US06332936B1
    • 2001-12-25
    • US09399364
    • 1999-09-20
    • Mohammad R. HajaligolClive ScoreyVinod K. SikkaSeetharama C. DeeviGrier FleischhauerA. Clifton Lilly, Jr.Randall M. German
    • Mohammad R. HajaligolClive ScoreyVinod K. SikkaSeetharama C. DeeviGrier FleischhauerA. Clifton Lilly, Jr.Randall M. German
    • B22F500
    • C22C33/0278B22F3/18B22F5/006B22F9/082B22F2003/248B22F2009/0824B22F2009/088B22F2998/10C21D8/0205C21D8/0236C21D8/0273C22C1/0491B22F3/115B22F3/16B22F3/24
    • A powder metallurgical process of preparing a sheet from a powder having an intermetallic alloy composition such as an iron, nickel or titanium aluminide. The sheet can be manufactured into electrical resistance heating elements having improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The iron aluminide has an entirely ferritic microstructure which is free of austenite and can include, in weight %, 4 to 32% Al, and optional additions such as ≦1% Cr, ≧0.05% Zr ≦2% Ti, ≦2% Mo, ≦1% Ni, ≦0.75% C, ≦0.1% B, ≦1% submicron oxide particles and/or electrically insulating or electrically conductive covalent ceramic particles, ≦1% rare earth metal, and/or ≦3% Cu. The process includes forming a non-densified metal sheet by consolidating a powder having an intermetallic alloy composition such as by roll compaction, tape casting or plasma spraying, forming a cold rolled sheet by cold rolling the non-densified metal sheet so as to increase the density and reduce the thickness thereof and annealing the cold rolled sheet. The powder can be a water, polymer or gas atomized powder which is subjecting to sieving and/or blending with a binder prior to the consolidation step. After the consolidation step, the sheet can be partially sintered. The cold rolling and/or annealing steps can be repeated to achieve the desired sheet thickness and properties. The annealing can be carried out in a vacuum furnace with a vacuum or inert atmosphere. During final annealing, the cold rolled sheet recrystallizes to an average grain size of about 10 to 30 &mgr;m. Final stress relief annealing can be carried out in the B2 phase temperature range.
    • 从具有金属间合金组成如粉末铁,镍或钛铝化物的粉末制备片材的粉末冶金方法。 可以将片材制造成具有改善的室温延展性,电阻率,耐循环疲劳性,耐高温氧化性,低和高温强度和/或耐高温下垂的电阻加热元件。 铁铝化物具有完全不含奥氏体的铁素体组织,并且可以以重量%计含有4至32%的Al和任选的添加物,例如<= 1%Cr,> = 0.05%Zr <= 2%Ti, = 2%Mo,<= 1%Ni,≤= 0.75%C,<= 0.1%B,≤1%亚微米级氧化物颗粒和/或电绝缘或导电共价陶瓷颗粒,≤1%稀土金属, 和/或<= 3%Cu。 该方法包括通过将具有金属间化合物组合物的粉末如通过辊压,带铸或等离子体喷涂固结形成非致密金属片,通过冷轧非致密金属片形成冷轧板,以增加 密度并减小其厚度并退火冷轧板。 粉末可以是在固结步骤之前与粘合剂进行筛分和/或共混的水,聚合物或气体雾化粉末。 在固结步骤之后,片材可以部分烧结。 可以重复冷轧和/或退火步骤以实现所需的板厚度和性能。 退火可以在真空或惰性气氛的真空炉中进行。 在最终退火期间,冷轧板再结晶至平均粒径约为10〜30μm。 最终的应力消除退火可以在B2相温度范围内进行。