Materials Literature
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ナイロン6およびナイロン6と3種類の熱可塑性ダイマー酸系重合脂肪酸ポリアミド系エラストマーを混合したポリマーアロイの力学特性について検討した. エラストマー添加量の増加による分散粒子径の増大と結晶化度の低下とともに弾性率と降伏強度の低下が生じた. ナイロン6の衝撃強さは18℃から45℃まで昇温しても低い値が示した. これに対し, ナイロン6のポリマーアロイの衝撃強さは温度の上昇につれて著しく向上した. また破壊面と損傷領域のSEMの観察によってナイロン6の破壊プロセスがノッチ先端での塑性拘束による脆性破壊であることを明らかにした. ナイロン6のポリマーアロイの破壊は23℃の場合ナイロン6と同様でノッチ先端の塑性拘束によるものである…
目的 衣料用繊維材料の乾燥過程の研究として, 積層布の乾燥過程を研究することを目的とし, ポリエステルとレーヨンの平織布を積層した試料の乾燥特性曲線と含水率分布を測定した.成果 乾燥速度が減少し始める限界点における各積層布の含水率 (限界含水率) が, 1枚で乾燥したときの限界含水率に等しいことが分かった.このことは, 異種の布を重ねても成り立つことが分かった.また, 減率乾燥速度期における乾燥特性曲線において積層枚数が増えるほど乾燥速度が下がる積層の効果が確認された.この効果は, 斜めの含水率分布が原因となって起こり, レーヨン布で特に顕著であった.
無電解銅めっきによる針状結晶形成に及ぼす素材および下地処理の影響を調べた。バイアホールの深さ方向に対する影響は非常に大きく, 深いほど針状結晶が形成しにくくなった。これは, 無電解銅めっきの反応種を供給するための液循環や生成水素ガスの脱離などが大きく関与しており, それゆえ, 基板の揺動速度の上昇に伴って改善された。また, 下地銅の違いは, 触媒付与工程でのパラジウム析出量には差異を生じたが, 無電解銅めっきの針状結晶形成にはほとんど影響がなかった。さらに次亜りん酸塩+ほう酸, またはジメチルアミンボラン (DMAB) +ほう酸を用いた促進処理は, 著しくめっき析出性を改善した。この促進処理は, パラジウム触媒中の吸蔵水素量を高め…
"Advanced technology of brazing copper‐steel and steel sections." Welding International, 9(6), pp. 473–474
A soft-spin Heisenberg model is used to investigate the Curie temperature of elementary iron and iron-rich intermetallics such as Sm2Fe17. In the localized limit the mean-field solution of the classical Heisenberg model is reproduced, while quasi-localized perturbation theory accounts for band-structure effects. An ex…
The effects of a horizontal and a vertical DC magnetic field on the Rayleigh-Taylor instability between two inviscid liquid metals were studied by linear analysis. Since the dispersion relation in the vertical field is in the same form as that in the horizontal field, the stability characteristics of the interface are…
Abstract Twin structure of triclinic sodium oxalate monohydrate was determined by means of X‐ray techniques. The twin is formed by reticular pseudomerohedry, with [101] as twin axis and ( 1 01) as contact plane.
This paper introduces ten dimensionless groups formed from material properties and machine variables by analysis of the energies involved. These groups can be used as independent variables instead of the individual parameters to represent and analyse the test results with far greater efficiency.
The Ceramic-Matrix-Composites (CMCs) have come into prominence for structural applications because of their superior mechanical properties both at room temperature and at elevated temperatures. In conventional processing route of pressureless sintering, the rigid reinforcement phase (particulate or whisker) severly re…
Legislation in most advanced industrial countries is demanding more stringent protection of the water table. Chemical spillage and the diffusion of chemicals into the ground, leading to contamination of water, is being strictly controlled. A good example of these regulations is the containment of spillages of gasoline…
Rare-earth alumino-silicate glasses were prepared from Shirasu (volcanic ash) and yttria concentrate as the main starting materials. Specific heats and elastic constants of these glasses were measured at room temperature. Using these values and previously measured values of thermal expansion coefficients and densities…
Summary The aim of this work is to promote a basic knowledge of the phenomenon of sensitisation in the heat affected zone (HAZ) in austenitic stainless steels and provide information on a method of desensitisation using laser beams without impairing other types of corrosion resistance (pitting corrosion resistance). S…
Elemental boron and boron nitride powders were mixed and pressureless-sintered in nitrogen. The structure and mechanical parameters of the ceramics were investigated and compared with those obtained from boron nitride powder free of the elemental boron. A positive effect of the addition of boron was found in increasin…
Explosive filling in small-calibre shaped charges is carried out by pressing techniques. At present, pressing is carried out by single action method which suffers a drawback of density gradient in the charge from the face of the tool. A new method-double action pressing-has been established which eliminates this probl…
It is well known that a high reflectivity mirror can be made by coating multiple pairs of dielectric thin films of high refractive index contrast and quarter wave optical thickness onto an optically flat surface. The advantages of a multilayer dielectric mirror over a metallic first surface mirror include high reflect…
The construction and operation of an electrochemical sensor capable of monitoring the corrosion performance of zinc alloy coated steel under controlled atmospheric conditions are described. Sensors were fabricated from zinc and zinc alloy coated steel sheet with and without chromate conversion treatments. Corrosion be…
The anodic oxidation and corrosion of α-brasses (13.2 and 32.2% Zn) were investigated in Na2SO4 solutions under different experimental conditions using cyclic voltammetric technique and complemented with X-ray diffraction analysis. The anodic responses of the brass display two potential regions. The first anodic regio…
The effect of ambient atmosphere on the sintering of oxides was studied ever since the first experiments on sintering of aluminium oxide spheres were married out Several effects of atmosphere on sintering have been found to be important. These depend on the nature of interaction, whether physical or chemical, of the a…
New chiral dopants containing an optically active six-membered ring with a cyano group were synthesized. New chiral dopants containing an optically active six-membered ring with an epoxy group were also synthesized and the effect of the direction of the dipoles on spontaneous polarization were discussed using them. Th…
Methods of purifying sepiolite-paygorskite series were reviewed and discussed under the two purification categories: extraction of elements and elimination of minerals.A number of previous works focused on the extraction of elements from sepiolite by acid treatment because knowledge gained from basic studies on dissol…