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La-TZM合金板材制備及其氧化行為
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陜西省教育廳專項(xiàng)項(xiàng)目 (12JK0431)；陜西省重大科技創(chuàng)新項(xiàng)目 (S2011ZK1087)；西部材料創(chuàng)新基金 (XBCL-1-06)


Preparation and Oxidation Behavior of La-TZM Alloy Plates
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    摘要:

    采用粉末冶金法，在TZM合金的基礎(chǔ)上，固-液摻雜稀土元素La，且以有機(jī)碳源硬脂酸替代傳統(tǒng)的石墨粉引入C元素，經(jīng)混料、壓制成形、高溫?zé)Y(jié)、熱軋、溫軋、冷軋等工藝制備La-TZM合金板材。將La-TZM合金板材分別在300、450、600、800、1000 ℃進(jìn)行高溫氧化實(shí)驗(yàn)，通過(guò)質(zhì)量損失率、差熱分析等實(shí)驗(yàn)方法研究其氧化行為。研究表明：La-TZM合金板材的抗拉強(qiáng)度為1361.74 MPa，伸長(zhǎng)率為8.81%，較傳統(tǒng)的TZM合金均有顯著提高。La-TZM合金板材纖維組織細(xì)長(zhǎng)，組織致密；第二相細(xì)小且分布均勻。其細(xì)小的氧化鑭及第二相顆粒釘扎在晶界，生成的氧化物會(huì)在基體表面形成致密氧化物覆蓋層，可以有效地阻礙氧向基體的侵入，表面不易氧化，從而使TZM合金的抗氧化性能提高，擴(kuò)展了TZM合金的使用溫度范圍

    Abstract:

    Based on TZM molybdenum alloy, powder metallurgy methods were using to prepare La-TZM alloy plates with solid-liquid doped rare earth lanthanum and substitution of organic carbon stearic for traditional graphite by mixing, pressing and sintering, hot-rolling, warm-rolling, and cold rolling. La-TZM alloy plates were heated at 300, 450, 600, 800 and 1000 oC in the furnace to calculate the mass loss of the samples. The oxidation behavior was analyzed by the differential thermal analysis. The results show that the tensile strength and elongation of La-TZM plate are 1361.74 MPa and 8.81%, respectively, higher than those of traditional TZM plate. The fiber of La-TZM alloy plate is slim and homogeneous. The second phase of La-TZM alloy plate is smaller and disperses homogeneously. The La-TZM alloy has a more compact structure due to the lanthanum doping. The minute lanthanum oxide particles are pinned at the grain boundaries and refine the grains. Oxide layer generated on the matrix surface can form a compact coating, which effectively blocks the surface from being corroded by oxidation. The oxidation resistance of La-TZM alloys is enhanced, expanding its application range

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胡 平,王快社,楊 帆,何歡承,康軒齊,王 華,于志濤,譚江飛. La-TZM合金板材制備及其氧化行為[J].稀有金屬材料與工程,2014,43(7):1722~1726.[Hu Ping, Wang Kuaishe, Yang Fan, He Huancheng, Kang Xuanqi, Wang Hua, Yu Zhitao, Tan Jiangfei. Preparation and Oxidation Behavior of La-TZM Alloy Plates[J]. Rare Metal Materials and Engineering,2014,43(7):1722~1726.]
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  • 收稿日期:2013-07-15
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  • 在線發(fā)布日期: 2014-12-15
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