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  • Issue 4,1997 Table of Contents
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    • Structural Maps and Its Applications in Material Design

      1997(4):1-8.

      Abstract (1144) HTML (153) PDF 0.00 Byte (0) Comment (0) Favorites

      Abstract:The coordinate choice and constructions of structural maps are summarized, and applications of the maps in material design and prediction of new materials are briefly presented for these structural maps The most representative structural maps are the three-dimension-map and Mendeleev-structure-map The latter is the two-dimention map, in which the so-called Mendeleev number M is used for the coordinate The number M is the synthetical characteristic parameter, which can unitedly include the distinguishing feature of valent electronic dens, electronegativity, atomic radius The two-dimention map is also directly perceived through the sences and have a good advantage of integral, and so overcomes the shortcoming of the three-dimention-map

    • Valence Electron Structure and Eigen-Properties of W 2C Phase

      1997(4):9-12.

      Abstract (1337) HTML (159) PDF 0.00 Byte (8) Comment (0) Favorites

      Abstract:根據(jù)固體與分子經(jīng)驗(yàn)電子理論,對W2C相的價(jià)電子結(jié)構(gòu)進(jìn)行了定量分析,通過鍵距差方法計(jì)算了W2C晶體中各鍵上的共價(jià)電子數(shù)。結(jié)果表明,近似平行于c軸最近鄰的W-C原子鍵最強(qiáng),其共價(jià)電子數(shù)nA=0.69925,鍵能EA=141.2kJ/mol;近似平行于c軸的W-W原子間結(jié)合力次之,其共價(jià)電子數(shù)nG=0.20834,鍵能EG=46.24kJ/mol;位于(0001)面上的W-W原子鍵也較強(qiáng),該鍵上共價(jià)電子

    • Some Metallurgical Behaviours of Adiabatic Shear Band on Ti Side in the Ti/Mild Steel Explosive Cladding Interface

      1997(4):13-17.

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      Abstract:初步探討了鈦/鋼爆炸復(fù)合界面層內(nèi)鈦側(cè)所產(chǎn)生的絕熱剪切帶(adiabticshearband)在熱處理及各種準(zhǔn)靜態(tài)加載(如拉伸,壓縮,疲勞等)后其內(nèi)部組織和力學(xué)性能等冶金行為的變化情況,為絕熱剪切敏感材料的工程應(yīng)用提供實(shí)驗(yàn)依據(jù)和理論指導(dǎo),試驗(yàn)結(jié)果表明,經(jīng)熱處理及拉伸,壓縮等準(zhǔn)靜態(tài)加載后ASB內(nèi)的顯微硬度值都高于其鈦基體的顯微硬度值;經(jīng)550℃,30min退火后(低于純鈦的再結(jié)晶溫度)ASB內(nèi)已形成等

    • Effect of Heat Treatment on Microstructure and Properties of TP-650 Ti-Matrix Composite

      1997(4):18-21.

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      Abstract:研究了熱處理?xiàng)l件對TP-650鈦基復(fù)合材料組織與機(jī)械性能的影響?;w鈦合金的顯微組織以及TiC粒子與基體間的界面寬度隨熱處理加熱溫度而變。TiC粒子在熱處理過程中有較好的穩(wěn)定性,形態(tài)與分布沒有明顯改變。TiC粒子對基體鈦合金的再結(jié)晶產(chǎn)生重要影響,明顯阻礙了晶粒聚集長大。所試驗(yàn)的熱處理工藝對TP-650鈦基復(fù)合材料的強(qiáng)度極限無顯著影響,但簡單退火和較低溫度下的雙重?zé)崽幚砜梢垣@得較高的延性。

    • Microstructure and Property of A New Type of Ti 6253 Alloy

      1997(4):22-25.

      Abstract (1142) HTML (148) PDF 0.00 Byte (0) Comment (0) Favorites

      Abstract:用普通顯微鏡和透射電鏡研究了Ti6253(Ti-6Mo-25Nb-3Al)合金在冷變形,冷變形+時(shí)效,固溶,固溶時(shí)效狀態(tài)的顯微組織特征,并測定了該合金在時(shí)效狀態(tài)下的拉伸性能。用于本研究的試樣是由厚度1mm的冷軋材制取,結(jié)果表明,在冷變形的試樣中觀察到位錯(cuò)堆積和胞狀結(jié)構(gòu);冷變形和時(shí)效后,細(xì)小分散的α相從β晶內(nèi)析出;在500℃時(shí)效時(shí)強(qiáng)度達(dá)到1300MPa;在固溶處理后,獲得了等軸再結(jié)晶組織,并出現(xiàn)了穿

    • Thermal Stability of Al-12Ti-6Nb Alloy Prepared by Mechanical Alloying

      1997(4):26-29.

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      Abstract:將機(jī)械合金化(MA)Al-12Ti-6Nb合金在550℃下空氣中長時(shí)間暴露后,用光學(xué)顯微鏡和電子探針對其組織結(jié)構(gòu)變化進(jìn)行了觀察與分析,測定了維氏硬度。結(jié)果表明,MAAl-12Ti-6Nb表現(xiàn)出良好的熱穩(wěn)定性,在550℃下暴露200h后,Al3Ti中的亞穩(wěn)的α-Ti核才全部轉(zhuǎn)變?yōu)椋粒欤常裕?,Al3Ti顆粒隨之粗化,餅狀的Al3Ti變成橢球體;Al3Ti顆粒的粗化是通過Ti,Al原子擴(kuò)散所控制的α-T

    • Preparation and Properties of a Kind of Rapid Quench Bonded Magnet

      1997(4):30-35.

      Abstract (1116) HTML (160) PDF 0.00 Byte (0) Comment (0) Favorites

      Abstract:詳細(xì)研究了用快淬釹鐵硼制備粘結(jié)磁體的工藝和工藝因素對它的機(jī)械,電學(xué),磁學(xué)性能的影響。結(jié)果表明,運(yùn)用數(shù)種粘結(jié)劑均能獲得很好的結(jié)果,粘結(jié)劑的含量就在一個(gè)合適的范圍;為防止固化過程中的氧化,應(yīng)采用惰性氣氛,氧化后磁體出現(xiàn)α-Fe相;隨成形壓力的增大,剩余磁強(qiáng)度和磁能積增大;MQ粉末的居里溫度為360℃,粉末和粘結(jié)磁體的熱穩(wěn)定性都很好,剩磁溫度系數(shù)αBr(從室溫到120℃)=0.11%,開路磁通不可逆損失

    • Study of Tungsten Composite Powder with Rare-earth Oxide Produced by Liquid-Solid Blending Method

      1997(4):36-39.

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      Abstract:The tungsten composite powder with rare-earth oxide, in which the component and amount of doped phase are different, has been studied by the liquid-solid blending method, pyrolysis and reduction etc The effects of original powder on reduction temperature and the doped phase on the degree of reduction are discussed It has been showed that the composite powder made by WO 2 9 has good overall characters The reducing degree of the powder is enhanced with the temperatnre increasing The powder with a large amount of the doped phase is more difficult to reduce than that of a small amount of the doped phase The powder of ternary system is also more difficult to reduce than that of binary system The tungsten composite powder with rare-earth oxide made by the liquid-solid blending method has fine size and uniform disperse phase

    • Effect of Heat Treatment on the Corrosion Properties of the New Zr-Alloys

      1997(4):40-44.

      Abstract (1317) HTML (168) PDF 0.00 Byte (10) Comment (0) Favorites

      Abstract:采用靜態(tài)高壓釜腐蝕設(shè)備,在400℃,10.3MPa的水蒸汽中對幾種熱處理狀態(tài)的新鋯合金進(jìn)行了9個(gè)周期累計(jì)196天的腐蝕試驗(yàn),結(jié)果表明,在所研究的3種合金中,冷軋?jiān)嚇咏?jīng)過淬火后其抗均勻腐蝕性能較之經(jīng)過完全再結(jié)晶退火的試樣呈下降的趨勢,淬火處理降低耐蝕性能的原因是淬火試樣中形成了部分不穩(wěn)定的α′馬氏體組織,使β穩(wěn)定元素(Nb,Fe,Cr)在α相中過飽和;淬火后經(jīng)過25%冷加工的3種合金試樣其抗均勻腐蝕

    • Experimental Study of the Electrochemical Dissolution of Pt-Rh Alloys

      1997(4):45-48.

      Abstract (1255) HTML (152) PDF 0.00 Byte (1) Comment (0) Favorites

      Abstract:為解決鉑銠合金廢料分離提純工藝中的難題-鉑銠合金的溶解,探討了電化學(xué)溶解工藝,論述了在鹽酸溶液中加入適量的過氧化氫進(jìn)行交流電化學(xué)溶解的反應(yīng)機(jī)理,討論了電流密度,鹽酸濃度,過氧化氫加入量,溫度等因素合金溶解速度的影響,用正交試驗(yàn)方案找出了優(yōu)化的工藝條件,獲得了較快的溶解速度,該法操作簡單,不需要趕硝作業(yè),不污染鉑銠溶解液,可與王水溶解,中溫氯化,熔鹽溶解等傳統(tǒng)的方法相媲美,不污染的鉑銠溶解液,可與王

    • Study of the Pore Size of Stainless Steel Fibre Felt

      1997(4):49-52.

      Abstract (1232) HTML (164) PDF 0.00 Byte (1) Comment (0) Favorites

      Abstract:利用“毛細(xì)管束模型”理論推導(dǎo)出不銹鋼纖維燒結(jié)氈的中流量平均孔徑和最大孔徑與纖維直徑D和孔隙率E的理論方程,并在此基礎(chǔ)上,通過大量試驗(yàn)數(shù)據(jù)的處理,推導(dǎo)出中流量平均孔徑和最大孔徑的經(jīng)驗(yàn)方程,d=6.15.D.E^3.35,dmax=E^2.06(14.53D-11.36),文中還論述了纖維層數(shù)t/D對最大孔徑的影響,要得到均勻的高質(zhì)量纖維氈,應(yīng)適當(dāng)加大纖維氈單重。

    • Vacuum Welding of Palladium-Rare Earth Alloys with 316L Stainless Steel

      1997(4):53-55.

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      Abstract:研究了Pd稀土合金與316L不銹鋼的釬焊工藝,并選擇了合適的釬焊料,結(jié)果表明,所選釬料AgCuPd28-2,AgCuNi26-3能很好的地潤濕兩種母材,其α值均小于20°,其中AgCuPd28-2釬焊效果更好;接頭抗剪切力分別達(dá)到6900N和1120N,滿足了使用要求。Pd稀土合金與316L不銹鋼的釬焊工藝為:真空度就地10^-3Pa,將兩種材料及釬料開始升溫至770℃,保溫30min,然后再升溫

    • TeBr 4 Spectrophotometric Determination of Trace Te in TiAl Alloy

      1997(4):56-59.

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      Abstract:溴化碲分光光度法應(yīng)用于鈦鋁合金中微量碲的測定,取得了良好的效果。干擾試驗(yàn)表明,在所選定條件下,Zn,Mn,Mg,Pb,Mo,As,Y,Sn,Nb,Sb,P,Co,Ni,Ca,Si,Cd,Bi,Ce,Zr,W,V各1mg,Cu,Cr各0.1mgFe為0.2mg,對100μgTe的測定基本無干擾,TiAl基體的輕微干擾可以用同量的TiAl作參比而消除。分別對含Te0.100%和0.020%的兩組合成試

    • Application of ITO Target and the Explosive Forming Technology of ITO Tubular Target

      1997(4):60-63.

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      Abstract:銦在自然界是稀散金屬,其氧化物具有許多優(yōu)異的性能,合理利用銦資源的重要途徑之一是生產(chǎn)銦錫氧化物(ITO)靶材,介紹了ITO靶材的應(yīng)用領(lǐng)域,分析了平面ITO靶材與管狀ITO靶材的特點(diǎn),提出了ITO管狀靶材的爆炸成形技術(shù),與現(xiàn)有成形技術(shù)相比,爆炸成形工藝特別適用于管狀靶材成形,對制粉的要求將降低,不喪失粉末的優(yōu)良性質(zhì),通過爆炸成形工藝的分析可知,適當(dāng)控制狀飛片厚度,飛行距離,爆速,炸藥厚度并與粉末材料

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