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鈦合金熔模鑄造二醋酸鋯-氧化釔型殼的回溶及影響
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清華大學(xué)機械工程系,清華大學(xué)機械工程系,清華大學(xué)機械工程系

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）


The mechanism and influence of re-dissolution in zirconium diacetate-yttria shell for titanium investment casting
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Department of Mechanical Engineering, Tsinghua University,Department of Mechanical Engineering, Tsinghua University,Department of Mechanical Engineering, Tsinghua University

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Fundamental Research Funds for the Central Universities (2012QNA26); National Natural Science Foundation of China (51006117, 51271099) and Special Financial Grant from the China Postdoctoral Science Foundation (2012T50524)

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    摘要:

    研究了二醋酸鋯-氧化釔型殼（ZA-Y型殼）的回溶及其影響。使用重量法測定了型殼熱水、蒸汽條件下的回溶率；使用電子萬能試驗機測定了型殼抗彎強度，并計算了裂紋指數(shù)隨潤濕時間的變化規(guī)律；利用光學(xué)顯微鏡（OM）觀察了表面析出物的分布情況，用掃描電鏡（SEM）結(jié)合能譜分析（EDS）研究了其形貌與成分，使用X射線熒光分析（XRF）方法測定了ZA-Y型殼的成分，并分析了表面析出物產(chǎn)生的原因。結(jié)果表明，型殼20 min內(nèi)的回溶程度有限，最大吸水率為2.5%，回溶率為0.8%；強度下降26%，但裂紋指數(shù)下降至66%；表面析出物主要是由于偏鎢酸銨的回溶，包含兩種原因：泄壓速度過快或后續(xù)干燥快而散熱慢。

    Abstract:

    The re-dissolution of zirconium diacetate- yttria shell (ZA-Y shell) and its impact were studied. The re-dissolution rate under hot water and steamin miosture condition was measured by the balance. Three-point flexural strength was measured using the universal testing machine, and the fracture index was calculated. The distribution of the surface precipitates was observed by Ooptical microscope was used to observe the distribution of the surface precipitates, and its morphology and composition were tested using scanning electron microscopy (SEM) combined with energy spectrum analysis (EDS). Composition of the ZA-Y shell was measured by X-ray fluorescence (XRF) method. The reason of the precipitates was analysed. The results suggest the re-dissolution is limited. The maximum water penetration rate is 2.5% and the dissolution rate is 0.8% in 20 min. The strength reduces 26% and fracture index reduces to 66%. The surface precipitates are due to dissolution of ammonium metatungstate (AMT) and own two reasons: drastictoo high pressure release or fast drying condition with slow heat dissipation.

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郭馨,呂志剛,李培杰.鈦合金熔模鑄造二醋酸鋯-氧化釔型殼的回溶及影響[J].稀有金屬材料與工程,2016,45(2):303~308.[Guo Xin, Lu Zhigang, Li Peijie. The mechanism and influence of re-dissolution in zirconium diacetate-yttria shell for titanium investment casting[J]. Rare Metal Materials and Engineering,2016,45(2):303~308.]
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  • 收稿日期:2014-01-27
  • 最后修改日期:2014-02-25
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  • 在線發(fā)布日期: 2016-07-15
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