- Issue 5,2002 Table of Contents
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Li Zhenjiang , Li Hejun , Chen Xiaolong , Li Kezhi , Cao Yongge , Li Jianye
2002(5):321-324.
Abstract:氮化鎵是寬的直接帶隙半導(dǎo)體材料，由于其優(yōu)異的性能，使之成為制作耐高溫，大功率，低能耗電子器件，高速場(chǎng)效應(yīng)晶體管，高效藍(lán)光發(fā)光二極管（LED），激光二極管（LD）和紫外光電導(dǎo)探測(cè)器等光電子器件的理想材料，低維GaN納米材料在基礎(chǔ)理論研究和納米技術(shù)應(yīng)用等方面都具有巨大潛力，因此，近年來(lái)低維GaN納米材料的制備和物性研究已成為熱點(diǎn)之一，本文報(bào)道了低維GaN納米材料的最新制備方法的研究進(jìn)展。
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Yao Minqi , Wei Yinghui , Hu Lanqing , Xu Bingshe
2002(5):325-329.
Abstract:The Sol-Gel (S-G) method is a moderate temperature process for prepa ring nanomaterials. In this paper, we discuss the principle of the S-G method, problems associated with it, as well as the hydrolysis characteristics of inor ganic compounds and metal alkoxides. By way of case study we consider the S-G p rocessing SnO2. We also go on to consider the future of the S-G method.
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Liu Chunfang , Du Shejun , Wu Xuan , Pang Ying , Wang Feiyun , Liu Xianghong , Feng Yong , Zhang Pingxiang , Wu Xiaozu , Zhou Lian
2002(5):330-333.
Abstract:在金屬Ni基帶上，用旋轉(zhuǎn)勻膠（spin)和刷涂（printing)工藝制備了具有c軸擇優(yōu)取向的YBCO厚膜，厚膜表面晶粒呈菊花和多邊形狀，菊花尺寸在0．2－0．5mm左右，最大尺寸達(dá)到1mm以上，多邊形狀晶粒常處在菊花的中心位置，MPMP（改進(jìn)的粉末熔化工藝粉）試樣中主要出現(xiàn)菊花狀晶粒，多邊形狀晶?；静怀霈F(xiàn)，PMP（粉末熔化工藝粉）試樣中2種形貌晶粒一般同時(shí)存在。添加中間層（Ag)之后，菊花狀晶粒消失或變得很不明顯，X射線衍射分析表明，試樣主要由Y123相組成并具有一定的C軸擇優(yōu)取向。
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Zi Bingtao , Yao Kefu , Wang Hui , Liu Wenjin Cui Jianzhong , Xu Guangming , Ba Qixian
2002(5):334-336.
Abstract:用ANSYS有限元軟件對(duì)脈沖磁場(chǎng)作用下，LY12鋁合金凝固過程中的速度場(chǎng)作了數(shù)值模擬，模擬結(jié)果和實(shí)驗(yàn)現(xiàn)象相吻合，通過數(shù)值模擬發(fā)展，用數(shù)值模擬方法不僅可以初步了解凝固過程中熔體的運(yùn)動(dòng)狀態(tài)，而且還可以了解凝固組織細(xì)化和產(chǎn)生缺陷的原因，是一個(gè)值得注意的研究方向，因此有較大的實(shí)用價(jià)值。
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Wang Richu , Liu Chunlei , Wang Chong , Jin Zhanpeng
2002(5):337-340.
Abstract:The diffusion triple technique is an advanced and efficient method for determining ternary phase diagrams. Phase equilibria in the Nb-Ti-Si ternary system at 1 473 K was investigated using diffusion triple technique and electron microprobe analysis (EMPA). The experimental results indicated that seven diffu sion layers (viz. TiSi2, TiSi, Ti5Si4, Ti5Si3, Nb5Si3, NbSi2 and M3Si) exist in the Nb-Ti-Si ternary system at 1 473 K, and that no ternary compound was obser ved in this diffusion triple. A tentative isothermal section of this system at 1 473 K was constructed on the basis of experimental data. The isothermal section consists of seven three-phase regions.
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Xu Ying , Li Mingli , Lu Fengji
2002(5):341-344.
Abstract:用“反應(yīng)法”制備納米TiO2/UPR，在反應(yīng)過程中納米TiO2粉發(fā)生輕微水解反應(yīng)，產(chǎn)生的羥基與不飽和聚酯中的羧基反應(yīng)，成功地將納米TiO2粒子接入不飽和聚酯長(zhǎng)鏈，這種新的結(jié)構(gòu)實(shí)現(xiàn)了對(duì)不飽和聚酯同時(shí)增強(qiáng)增韌改性，納米TiO2/UPR彎曲強(qiáng)度和沖擊強(qiáng)度較UPR分別提高了55％和46％，當(dāng)納米TiO2含量從1％增加至10％時(shí)，發(fā)現(xiàn)納米TiO2/UPR有明顯的脆－韌轉(zhuǎn)變現(xiàn)象，納米TiO2含量6％時(shí)為脆－韌轉(zhuǎn)變點(diǎn)。
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Xue Wenbin , Wang Chao , Ma Hui , Xie Mengxia , Chen Ruyi , Deng Zhiwei ,
2002(5):345-348.
Abstract:采用交流微弧氧化方法，在鋁酸鹽溶液中的TA2純鈦表面沉積一層厚度達(dá)30μm的氧化物陶瓷膜，并用掃描電鏡（SEM），能譜儀（EDS），X射線衍射（XRD），Raman光譜研究了氧化膜的成分和相結(jié)構(gòu)，研究表明：該氧化膜具有內(nèi)外兩層結(jié)構(gòu)，分別厚約15μm，氧化膜由TiAl2O5相和金紅石型TiO2相組成，但外層膜里TiAl2O5相含量比內(nèi)層膜里高得多，金紅石則主要分布在膜內(nèi)層里，來(lái)自溶液的鋁原子已擴(kuò)散到膜／鈦基體界面，但膜外層的鋁含量比內(nèi)層高得多，微弧放電區(qū)瞬間高溫高壓過程對(duì)純鈦基體沒有影響，Al,O原子都沒有擴(kuò)散進(jìn)入未氧化的鈦基體。
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An Xizhong , Zhang Yu , Liu Guoquon , Qin Xiangge , Wang Fuzhong , Liu Shengxin
2002(5):349-352.
Abstract:In this paper, the chemical reaction model in the growth of {100} orie nted CVD (chemical vapour deposition)diamond film is founded, and the growth mec hanisms of surface chemisorption are related to: (1) the BCN mechanism; (2) the dimer insertion; and (3) the trough insertion, in which the trough insertion mec hanism is in dominant. The growth process of (100) surface under this model is s imulated in atomic scale by using the modified KMC method, and the effect of sub strate temperature and CH3 concentration on film quality is provided. The result s show that this chemical reaction model can actually reveal the growth of {100} oriented CVD diamond film.
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Liang Zuojian , Xu Qingyan , Li Juntao , Zhang Ji , Liu Baicheng , Zhong Zengyon g
2002(5):353-357.
Abstract:γ－TiAl金屬間化合物的成形工藝是材料成形領(lǐng)域的前沿領(lǐng)域和研究熱點(diǎn)，本研究采用水冷銅坩堝真空感應(yīng)凝殼技術(shù)和熔模型殼離心澆注的鑄造方法制備γ－TiAl增壓渦輪，通過改善冒口工藝獲得了健全的γ－TiAl渦輪鑄件，分析了γ－TiAl增壓渦輪的凝固過程和收縮缺陷產(chǎn)生原因，結(jié)果表明，增大冒口與然件的模數(shù)之差以及冒口與鑄件的體積之比有利于減少及消除渦輪鑄件的收縮缺陷，為給數(shù)值模擬研究提供熱物性參數(shù)，針對(duì)渦輪鑄件用鈦鋁合金，實(shí)驗(yàn)測(cè)試了合金的熱膨脹系數(shù)，比熱和熱導(dǎo)率等物性參數(shù)，其與溫度的關(guān)系分別為：α1=8.10651 0.0073T-2.97619E-6T^2,Cp=668.28158-0.013T 1.11905E-4T^2;λ=19.82252-0.02781T 6.5197E-5T^2-3.21096E-8T^3.
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Jin Yunxue , Zeng Songyan , Wang Hongwei
2002(5):358-362.
Abstract:用熔鑄法制備了TiCp/Ti-15Al復(fù)合材料，并通過SEM，XRD，EDX等手段，對(duì)合金鑄態(tài)及熱處理態(tài)的相組成及碳化物形態(tài)進(jìn)行了研究，結(jié)果表明：合金在β－Ti(1300℃）區(qū)域熱處理時(shí)，TiC枝晶首先從根部溶斷，并逐步成為顆粒狀，在α－Ti- βTi TiC三相區(qū)（1100℃）域熱處理時(shí)，TiC枝晶部分溶解成為禿枝狀同時(shí)析出了大量板片Ｔi3AlC,均勻分布在基體中，（0001）a-Ti面與（111）Ti3AlC面的晶格錯(cuò)配度很小，可形成共格界面，因此{(lán)0001}a-Ti面的層錯(cuò)形成的ABC…堆垛層，可成為Ti3AlC的晶胚，Ti3AlC晶胚生長(zhǎng)時(shí)會(huì)以自動(dòng)分支的方式調(diào)節(jié)Ti3AlC片的厚度和片間距。
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Zhao Zexiang , Jiang Zhuangde , Wang Hairong
2002(5):363-366.
Abstract:在介紹納米壓入法微機(jī)械力學(xué)性能測(cè)量原理的基礎(chǔ)上,提出了納米壓入法微機(jī)械材料力學(xué)性能測(cè)量不確定度的I,II類影響因素的觀點(diǎn),并將I類影響因素分為直接和間接影響因素,將II類影響因素分為主要影響因素和次要影響因素。在闡述由這些因素產(chǎn)生的測(cè)量不確定度的評(píng)價(jià)方法基礎(chǔ)上,對(duì)單晶硅(111)體材的硬度和彈性模量進(jìn)行了測(cè)量與評(píng)定,其硬度和彈性模量的評(píng)定結(jié)果分別為13.57GPa±0.85GPa和156.33GPa±7.85GPa。
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Niu Xinshu , Xu Yajie , Xu Jiaqiang
2002(5):367-370.
Abstract:N-type semiconducting nanometer oxides including SnO2,In2O3,ZnO,an d Fe2O3 were prepared by solid state reaction with inorganic compounds at room t emperature. The phase composition and microstructure of the powders were studied by XRD and TEM. The results show that the complete solid state reaction was ach ievable at room temperature. The mean particle size of powder is below 100 nm. T he gas sensing characteristics of the pure powders were studied. The results sho w that sensors made from SnO2,In2O3 have a high sensitivity and selectivity to LPG and ethanol, while the sensors made from ZnO,Fe2O3 have relatively poor sen sitivity.
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Zhang Chunguang , Qiao Guanjun , Jin Zhihao
2002(5):371-374.
Abstract:基于部分液相瞬間連接工藝，采用Ni-Ti活性釬焊技術(shù)實(shí)現(xiàn)了高純Al2O3陶瓷與可伐合金（4J33－Kovar)的氣密性封接，采用微觀組織分析，微區(qū)優(yōu)分分析和X射線衍射分析等方法，研究了封接反應(yīng)的微觀機(jī)理，研究結(jié)果表明，氧化鋁陶瓷中的氧擴(kuò)散進(jìn)入焊料中，在焊料／Al2O3界面形成了Ni2Ti4O反應(yīng)層，厚度1μm-2μm，起到了陶瓷晶格到金屬晶格的過渡作用。
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Meng Liang , Zhang Lei , Zhou Shiping , Yang Futao , Shen Qijie
2002(5):375-378.
Abstract:研究了不同溫度擴(kuò)散處理?xiàng)l件下Au/Ag-Cu/Cu-Ni-Zn3層復(fù)合薄帶材在 結(jié)合面區(qū)域的成分分面。結(jié)果表明：在Ag-Cu/Cu-Ni-Zn結(jié)合面區(qū)域，擴(kuò)散溫度升高可促使Ni,Zn的遷移，但對(duì)Cu的遷移無(wú)明顯影響，在Au/Ag-Cu結(jié)合面區(qū)域，較高的擴(kuò)散溫度可使Au,Ag及Cu原子通過原始結(jié)合面迅速遷移而互溶，導(dǎo)致純Au表層演變?yōu)锳g-Au-Cu合金層。
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Bai Yujun , Lu Chengwei , Xu Xiangang , Geng Guili , Yin Longwei
2002(5):379-381.
Abstract:通過差示掃描量熱技術(shù)研究了不同的加熱速率對(duì)CuZnAlMnNi記憶合金中雙可逆相變的影響，結(jié)果表明：快速加熱抑制了X→M轉(zhuǎn)變卻有利于馬氏體逆轉(zhuǎn)變，使兩個(gè)相變峰靠近，隨著加速速率的降低，兩個(gè)相變峰逐漸分離。
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Wang Ping , Lu Guimin , Cui Jianzhong
2002(5):382-384.
Abstract:研究了液相線半連續(xù)鑄造法制備A356鋁合金半固態(tài)漿觸變成形并經(jīng)固溶時(shí)效處理后的組織與性能，結(jié)果表明，觸變成形與熱處理后的A356件，其σb值達(dá)到238MPa,δ5達(dá)到17％，此結(jié)果為液相線半連續(xù)鑄造A356鋁合金觸變成形的深入研究奠定了基礎(chǔ)。
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Liu Xiansong , Zhong Wei , Gu Benxi , Du Youwei
2002(5):385-388.
Abstract:采用陶瓷工藝，制備了Sr1-xLaxFe12O19M型鍶鐵氧體，系統(tǒng)地研究了稀土La^3 取代Sr^2 對(duì)M型六角鐵氧體的結(jié)構(gòu)和磁性的影響，La^3 離子取代部分的Sr^2 離子能明顯改善M型鐵氧體的內(nèi)稟磁性。
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Li Qiang , Liu Wenqing , Zhou Bangxin
2002(5):389-392.
Abstract:用透射電子顯微鏡研究了變形及熱處理對(duì)Zr-Sn-Nb合金中β-Zr分解的影響，試樣經(jīng)750℃，0．5h處理快冷后，在晶界上形成塊狀的β-Zr，在晶粒內(nèi)形成棒狀的β-Zr，經(jīng)1000℃，0．5h處理快冷后，在板條晶粒的晶界上形成層狀的β-Zr，晶界上的β-Zr在560℃熱處理時(shí)發(fā)生的分解，得到顆粒狀的β-Nb（100nm-200nm)，但晶內(nèi)棒狀的β-Zr并不發(fā)生分解，變形使β-Zr變得更不穩(wěn)定，促進(jìn)其分解時(shí)的成核，可以得到粒徑更小（10nm-60nm)的β-Nb第二相，原來(lái)不易發(fā)生分解的晶內(nèi)棒狀β-Zr，經(jīng)變形處理后也可以發(fā)生分解，為了在含Nb的合金中獲得細(xì)小并且均勻分布的β-Nb第二相，坯料經(jīng)過均勻化β相加熱淬火后，在后續(xù)的成材加工過程中，不應(yīng)在高于610℃的溫度下進(jìn)行熱處理，要避免重新形成塊狀的β-Zr。
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Yu Wuxing , Lin Jun , Wang Chunwu , Xue Haihui , Lin Renrong , Geng Dianqi , Wei Hairong
2002(5):393-396.
Abstract:Heating and cooling curves for the double-memory-type shape memory a lloy (SMA) Cu-29 8 Zn-4Al have been measured. The microstructure of the allo y aged at various temperatures have been investigated using TEM. After analyzing properties of the alloy, the application parameters of a double-memory-type s pring formed from it were calculated. Based on the experimental data a themo-co ntrol valve for oil-field use was designed. The valve can switch on or off aut omatically. of simple construction, it functions reliably and is suitable for us e in critical situations .
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Li Jianwen , Chen Yungui , Tu Mingjing
2002(5):397-397.
Abstract:The effects of heat treatment at 673 K, 1 173 K and 1 373 K on the ele ctrochemical properties of the hydrogen storage alloy LPC(NiCoAlMn)5 0, such as activity, discharge capacity and rate-of-discharge capacity, have been invest igated. The results show that the cycling stability and large discharging capaci ty are improved. The alloy heat treated at 1 173 K has good electrochemical prop erties.
