镍基高温合金渗铝层组织结构及高温氧化性能研究
首发时间:2014-02-24
摘要:采用固体粉末包埋技术对镍基高温合金进行渗铝,考察不同渗铝工艺对渗层相结构、渗层截面元素分布、渗层厚度及渗层显微硬度等的影响;并对所制备的渗铝试样进行抗高温氧化性能检测。结果表明,随着渗铝温度的增加,渗层厚度增加,铝元素的扩散系数增大,渗层硬度降低,渗层的相组成由单一的Ni2Al3相转变为Ni2Al3、NiAl和NiAl3的混合相;增加渗铝保温时间,渗层厚度增加,铝元素的扩散系数降低,渗层的相组成也由单一的Ni2Al3相转变为Ni2Al3、NiAl和NiAl3的混合相,渗层硬度降低。镍基高温合金渗铝后,抗高温氧化性能得到了明显地提高。
关键词: 材料学;镍基高温合金 固体粉末包埋 镍铝化合物涂层 高温氧化
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The microstructure and oxidation resistance of nickel aluminide coating on Nickel-based superalloy
Abstract:In this thesis,the Al coating on the surface of nickel-based superalloy has been prepared using powder embedding technology. The effects of the aluminized temperature and aluminized holding time on the phase structure,concentration distribution in cross section , the thickness and the hardness of the aluminized coatings were studied.Furthermore,1000 ℃×200 h temperature oxidation test was performed on the original sample and the aluminized sample to inspect the high temperature oxidation resistance of aluminized sample.It is shown that with the increase of the aluminized temperature and aluminized holding time,the coating phase transform to a single NiAl phase from Ni2Al3/NiAl/NiAl3 mixed phase;the thickness of the coating increased and the hardness descended. Moreover,the diffusion coefficient of aluminum increased with the increase of the aluminized temperature and dropped with the increasing aluminized holding time.Aluminizing increased the oxidation resistance of Nickel-based superalloy.
Keywords: Material science Nickel-based superalloy Solid powder Nickel aluminide coating High temperature oxidation
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镍基高温合金渗铝层组织结构及高温氧化性能研究
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