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Studies on Preparation and Mechanical Properties of Y2O3/ Carbon Nanotubes/ Nickle Matrix Composite

Author: XuChangEn
Tutor: XuJinCheng
School: Lanzhou University
Course: Materials Science
Keywords: Nickel-based composite materials Carbon nanotubes Powder metallurgy Age Hardening Oxide dispersion strengthened Larson - Miller parameter Magnetic
CLC: TB33
Type: Master's thesis
Year: 2009
Downloads: 142
Quote: 0
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Abstract


Nickel-based high-temperature composite material is a gas turbine engine with a high temperature composite materials in metallic materials. Most of the currently used nickel-base superalloy based to 20CrNi alloy. By the aging precipitated gamma 'phase precipitation strengthening effect enables high-temperature alloy to obtain a better temperature mechanical properties. Oxide particles dispersed enhance the rise of nickel-based composite materials specified in the new research direction, in order to improve the performance of nickel-based superalloy, nickel-based composite oxide particles enhanced the use of powder metallurgy manufacturing is a very good development prospects high-temperature alloys. Of 20CrNi matrix alloy, powder metallurgy method. Fashioned Y 2 O 3 / NiCrAl composite materials. In the matrix alloy Al, Al by aging precipitation of gamma 'phase precipitation strengthening effect; join in the the NiCrAl material in the Y 2 O 3 and According to the Larson-Miller parameter equation of the Y 2 O 3 / NiCrAl composite materials for high temperature simulation, Y 2 O 3 < / sub> nickel-based composites. Carbon nanotube composites and performance of the nickel-based study. The results show that: 1, in the 20CrNi matrix alloy aluminum at 760 ℃ aging 24-hour precipitation of gamma 'strengthening phase can significantly improve the mechanical properties at room temperature. Such as NiCr-6.0% Al material after aging at room temperature hardness than 20CrNi the 118% of the room temperature tensile strength increased by 26%. 2, at room temperature, the the γ'- Y 2 O 3 the strengthening effect is very good, in the Y 2 O 3 mass fraction of 0.8% best strengthening effect, the hardness value than before the the composites 0.8% Y 2 O 3 / NiCr-6.0% Al aging the NiCr-6.0% Al base material of high hardness values ??of 29%, while the value of the hardness after aging 82% higher hardness values ??than, NiCr-6.0% Al base material. 3, pure gamma 'phase reinforced Ni matrix composite material performance degradation when running at high temperatures, more obvious, such as NiCr-6.0% Al alloy in the thermal simulation parameters P = 31825 under high temperature simulated hardness after only 183HV, 47% lower than room temperature hardness 345HV. Add to the Y 2 O 3 after the composite materials in high temperature operation can still maintain good performance, for example, the 0.8% Y of 2 O < sub> 3 / NiCr-6.0% Al in the thermal simulation parameters P = 31825 high temperature simulated hardness is only 25% lower than the room temperature hardness. In good agreement with experiments with Larson-Miller parameter equation, using the Larson-Miller parameter to simulate the design life of such composites showed good accuracy and usefulness. 4, when the volume fraction of carbon nanotubes to 15% nickel, carbon nanotubes in the base to the room temperature hardness and tensile strength of the composite material to achieve the best, and adding carbon nanotubes on a nickel base material saturation magnetization and coercive force have had a significant impact.

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