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Abstract:Recent new progress in magnetic functional materials and applications in 1998~1999 is reviewed. The review includes:(1) magnetic sensor new materials;(2) hexagonal system microwave ferrite materials;(3) large capacity spin valve magnetic memories;(4) magnetic thin tape and film transforms;(5) large power application of ferrite materials.

Abstract:Progresses and directions of HTS applications world wide are reviewed in this paper, especially with respects to:transmission cables, transformers, fault current limiters(FCL), current leads, motors, flywheel power storage systems, magnetic resonance imagine (MRI), and magnetic levitation trains (Maglev). Prepared and developed in our country are materials for power cables, current leads, FCL, MRI, and Maglev. Accordingly, we should seize the opportunities and face the challenges to optimize the processing of superconducting tapes and bulk materials, to increase their homogeneity, mechanical properties and quantities, to decrease their costs and ac losses, in order to meet the coming new age of HTS commercialization.

Abstract:Based on X ray pole figure measurement, the principle, formulas, and practical experimentation on calculating the volume fraction of cubic textured Ni in the substrate for YBCO coated superconductor are presented. The method is reasonable and reliable, and can be used for other components of the texture.

Abstract:利用彈性理論分析了稀土原子鈰（Ｃｅ）與２０９０鋁鋰合金中其它溶質(zhì)原子（Ｃｕ和Ｌｉ）間的交互作用，并采用離子探針和透射電鏡（ＴＥＭ）分析研究了微量Ｃｅ的添加對Ｃｕ和Ｌｉ結(jié)合能的影響以及富Ｃｕ相（Ｔ１相）形態(tài)的變化。研究結(jié)果表明：Ｃｕ原子在Ｃｅ原子周圍的偏聚比Ｌｉ在Ｃｅ原子周圍的偏聚具有更低的彈性勢能；微量Ｃｅ的添加對Ｃｕ的結(jié)合能產(chǎn)生較大影響，使Ｔ１相表現(xiàn)出較小的長厚比。

Abstract:采用定向凝固連續(xù)鑄造技術(shù)成功制備了纖維增強的自生復(fù)合Ｃｕ－Ｃｒ合金電車線線坯，并對自生復(fù)合Ｃｕ－Ｃｒ合金的定向凝固特性，包括組織形態(tài)、枝晶間距及纖維長度等，作了詳細的研究。實驗結(jié)果表明：保持平面狀或胞狀的凝固界面有利于纖維狀的自生復(fù)合組織的形成；當ＧＬ＝２１０℃／ｃｍ，Ｖ＝０．６ｍｍ／ｍｉｎ時，Ｃｕ－０．８％Ｃｒ合金凝固界面呈平面狀；增加凝固速率，Ｃｕ－Ｃｒ合金的一次枝晶間距呈先增大后減小的規(guī)律，

Abstract:The failure stress of two kinds of alumina with six different notch radii were tested. Statistical analysis of the fracture strength indicates that although the fracture strength of smooth specimens conforms to a Weibull distribution, the fracture strength of notched specimen conforms to a normal distribution. The test results show that fracture toughness of structural ceramics also conforms to normal distribution.Therefore the normal distribution will be adopted as reliability design is applied to structural ceramics.

Abstract:Microstructural variation and crack propagation of modified Ti Cr Si silicide coatings on the niobium alloy C 103 during oxidation at high temperatures in air have been studied. The results show that the crack propagation behavior is commonly determined by superficial glass phase, the silicon content of the body coating, and the growth and mechanical properties of low valent silicide.

Abstract:采用俄歇電子能譜法研究了 Mo- L a2 O3陰極材料中 L a2 O3向表面的富集過程。結(jié)果表明 ,在高溫下 ,L a2 O3以 L a3+ ,O2 - 離子的形式分別向表面擴散 ,然后在表面上重新結(jié)合成分子。在 112 3 K～ 142 3 K范圍內(nèi) ,L a3+ ,O2 -離子的擴散系數(shù)分別為 :DL a=3.6 70 3× 10 - 1 6 exp (- 1.0 16 39× 10 5 / RT) m2 / s;DO=1.5 12 2× 10 - 1 6 exp (- 8.130 6 6× 10 4/ RT) m2 / s

Abstract:The main defects frequently occurring in injection molded cemented carbide parts and their origin have been analyzed. Some effective measures to reduce or avoid the defects are proposed. The application prospects and some problems that need to be solved in the powder injection molding of cemented carbides are discussed in detail.

Abstract:The burning behavior of titanium alloys in a mixture of Ar and O 2, and a way of extinguishing the titanium fire have been studied. It was shown that titanium burns in an oxygen rich atmosphere, and that Ar gas can be used to extinguish the fire. Both the burning products and interface between the burning products and matrix are porous when titanium burns in an oxygen rich atmosphere.

Abstract:The effects of macromolecular dispersant and subzero treatment on the preparation of ultrafine non agglomerative zirconia powders have been studied. The results show that adding a macromolecular dispersant at the beginning of deposition, and the subzero treatment after the wet gel being neutrality not only shorten the cleaning period, but also avoid the agglomeration of zirconia powders(particle size of 10 nm~30 nm). The mechanism is also discussed and analyzed.

Abstract:In order to improve the resistance to natural aging and softening, and property stability of ornamental silver, the dependences of mechanical properties of the silver alloyed with 0 12 wt%(La+Y) on aging temperature have been studied. The experimental results show that the hardness and resistance to softening of Ag can be improved by the addition of small amounts of rare earth elements. SEM analysis indicate that significant grain refinement result. The rare earth additions effectively defer the recovery and recrystallization of silver, thereby improving the resistance to natural aging and softening, and increasing the repeatablility of property.

Abstract:TiO 2 nano powders were prepared by means of microwave radiation using the collosol of titanium dioxide hydrate made from sponge titanium. TEM analysis indicates that the morphology of the nano particles is spherical, and the particle size is in the range of 60 nm~100 nm. The distribution of the particle size is fine. The Zeta potential value of the sample in water is +48 7 mV, indicaling good dispersivity. The transformation temperature of the nano crystal is much lower than that of the common crystal. The starting material is cheaper, and using this method nano particle size is easily controlled in production.

Abstract:試驗證實了高溫下鉑銠 10 -鉑熱電偶在 H2 或 CO氣氛中使用時因脆性而會很快斷裂失效。采用透射電鏡(TEM)對脆斷偶絲進行了研究認為 :脆斷失效的根本原因在于 Si與 Pt作用形成 Pt5 Si2 低熔點共晶物 ,使偶絲局部熔點降低而熔化 ,發(fā)生脆斷。通過采用 Sol Gel Dip Coating工藝在鉑銠 10 -鉑熱電偶絲上成功制備了 Al2 O3· Y2 O3涂層。對涂層鉑銠 10 -鉑熱電偶分別在 H2 和 CO還原性氣氛中進行了試驗研究 ,結(jié)果表明涂層鉑銠 10 -鉑熱電偶試樣可通過還原性氣氛中長期穩(wěn)定性試驗 ,克服了脆斷失效問題