新型金属-树脂间粘接性单体的合成与应用

甲基丙烯酰氧癸基硫脲嘧啶羧酸酯;粘接性单体;复合树脂;牙用合金;粘接性能     

乙酰胺-尿素-NaBr熔体中Gd-Ni合金的电化学制备

熔盐电解法制取稀土合金功能材料具有低成本等优点.本文选取353 K的乙酰胺-尿素-NaB r熔体,应用循环伏安法研究镍于该熔体(含0.063 mol.L-3N iC l2)、Pt、Cu电极上的还原.实验表明,N i(Ⅱ)+2 eN i(0)是一步完全不可逆反应,测得在Pt上N i(Ⅱ)的传递系数α=0.28,扩散系数D0=4.63×10-5cm2.s-1,Cu上α=0.22,D0=6.05×10-7cm2.s-1.以Cu作基体,Gd(Ⅲ)于该熔体不能单独还原为Gd(0),但可以被N i(Ⅱ)诱导共沉积.由恒电位法电解得到的Gd-N i合金,Gd(0)的含量随电解电位、Gd(Ⅲ)/N i(Ⅱ)摩尔比及电解时间的变化而变化.控制电解电位为-0.75 V,Gd(Ⅲ)/N i(Ⅱ)摩尔比为1∶1,电解20 m in.所得合金膜是非晶态的.     

渗硼并两步处理硬质合金微晶金刚石涂层工具研究

研究了固体粉末渗硼并碱酸两步处理预处理硬质合金基体的表面组织、形貌、粗糙度,并在处理过的硬质合金基体上,用强电流直流伸展电弧等离子体CVD法沉积微晶金刚石薄膜涂层.进一步的涂层质量表征,附着力测试及切削实验研究结果表明,这种涂层质量高、附着力好(压痕测试临界载荷大于1500N).金刚石涂层工具的切削加工性能明显优于无涂层硬质合金工具.在加工ZAlSi12合金时,微晶金刚石涂层车刀片、铣刀片的切削寿命是无涂层车刀片、铣刀片切削寿命的32倍和26倍.     

Ni-Sn电极析氢性能研究

在Fe基底材料上电镀Ni_Sn合金制备低析氢过电位的阴极活性材料 .该材料适用于氯碱工业隔膜型电解槽 ,可达到降低槽压、节能降耗的目的 .在电解槽阴极溶液NaOH 12 0 g/L ,NaCl190 g/L ;温度 90℃ ,阴极极化电流密度i=15 0mA/cm2 的条件下 ,测得其析氢过电位为 88mV .X射线衍射分析表明 ,该种材料与传统装饰用Ni_Sn合金的结构状态有所不同 .采用循环伏安法对Fe电极和Ni_Sn合金电极进行分析 ,可初步判断Ni_Sn合金对氢的吸附较弱 ,有利于析氢反应的进行     

The effect of Nb addition on the thermal stability and magnetic properties of Fe-based amorphous alloys with a wide supercooled liquid region

We have examined the effect of Nb addition on the thermal stability of the supercooled liquid before crystallization, the glass-forming ability and magnetic properties for the amorphous alloy series Fe₇₃Nb_xAl_5-xGe₂P₁₀C₆B₄ and Fe₆₃Co₇Nb_xZr_10-xB₂₀. The supercooled liquid regions (ΔT_x=T_x-T_g) have maximum values of 66 and 79K, respectively, for Fe₇₃Nb₁Al₄Ge₂P₁₀C₆B₄ and Fe₆₃Co₇Nb₄Zr₆B₂₀ alloys. The saturation magnetization σ_s of the Fe₇₃Nb_xAl_5-xGe₂P₁₀C₆B₄ alloy system is much higher than that of the Fe₆₃Co₇Nb_xZr_10-xB₂₀ alloy system, and is almost unchanged with an increasing Nb content from 0 to 3 at%. But the σ_s of the Fe₆₃Co₇Nb_xZr_10-xB₂₀ alloys decreases linearly with increasing Nb content. The coercive force H_c of the two alloy series can have a minimum value of 31A/m for Fe₇₃Nb₁Al₄Ge₂P₁₀C₆B₄ and 37A/m for Fe₆₃Co₇Nb₄Zr₆B₂₀. All these values are for the ribbons annealed at 773 and 873K for 15min in vacuum.     

Mg0.9Ti0.1Ni0.85Co0.15合金的石墨粉及镍粉球磨表面包覆性能

选用非晶态的Mg0.9Ti0.1Ni0.85Co0.15合金粉末与石墨粉及镍粉进行球磨表面包覆。SEM分析结果表明,己包覆石墨和镍粉的合金表面上吸附着一层小的颗粒,形成薄层将原来的合金表面包覆起来。使用XPS分析了合金表面元素。结果表明,包覆石墨粉后,合金表面碳元素的质量分数和原子分数均增加,Mg的质量分数从22.74%减小至22.23%,原子分数从36.43%减小到32.94%,从而减小了Mg在碱液中的腐蚀几率,提高合金的抗腐蚀性能;包覆镍粉后,合金表面Ni的质量分数由59.89%增加到60.04%,原子分数由40.63%增加到41.02%,形成合金表面富Ni的保护层,提高了合金的抗腐蚀性能。充放电循环测试表明,循环30周后,包覆石墨粉的合金电极容量保持率为32.05%,包覆镍粉的合金电极容量保持率为41.26%,而未包覆的电极容量保持率仅为17.88%。合金电极极化曲线测试结果表明,石墨或镍粉的包覆提高了Mg0.9Ti0.1Ni0.85Co0.15合金电极的循环稳定性和在KOH碱液中的抗腐蚀性能。     

超细非晶态NiCoB合金催化剂的制备及其对大豆油加氢活性研究

对大豆油、菜籽油等植物油的选择性加氢和深加工己成为加氢领域需要迫切解决的问题,新型催化剂的研发是油脂氢化的关键。     

Effect of Heat Treatment on Structure and Magnetic Performance of Ni-Fe-P Alloy Obtained by Electroless Plating

The electroless deposition of Ni68-Fe10.5-P21.5 alloy has been investigated. The crystallization behavior of the deposit was comparatively studied by using differential scanning calorimetry and X-ray diffractometry. The deposit transforms into a square Ni3P phase at 380. 0 ℃, then changes into a cubic FeNi3 phase at 490. 0 ℃. The microhardness, the size of the formed grains and the magnetic performance of the deposit increase with the increase of the heat treatment temperature below 500 ℃, then they decrease after this temperature. The effect of heat treatment time at 500 ℃ on the surface micromorphology, the structure and the magnetic performance of the deposit were also studied. The resuits show that with the increase of heat treatment time, the extent of crystallization of the deposit increases and the size of the formed grains becomes uniform. The results also show that the magnetic performance of the deposit under heat treatment for 40 min is maximal and then decreases with the increase of heat treatment time. The property change of the deposit is related to the crystal structure and the size of the formed grains of the deposit.     

螺旋纳米碳纤维的制备与表征

利用氢电弧等离子体法制备了纳米铜-镍合金作为催化剂,通过乙炔的催化热解制备了对称生长的螺旋纳米碳纤维.并用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和红外(IR)对其进行表征,发现在单个纳米铜-镍合金粒子上对称生长出两根螺旋纳米碳纤维,它们的旋向相反,但是具有相同的螺旋直径、螺旋长度和碳纤维直径,而且纳米铜-镍合金粒子也有各种不同的形状.此外,这两根对称生长的螺旋纳米碳纤维之间的夹角也不同,分别为60°,90°,110°和160°.IR结果表明,螺旋纳米碳纤维分子结构中既含有不饱和的CC双键,又含有饱和的-CH₂-和-CH₃-基团.然而,利用氢电弧等离子体法制备的纳米铜和纳米镍作为催化剂,催化热解乙炔,得到的产物均是直线型碳纤维.     

Ni-Fe-B/MCM-41非晶态合金的合成与表征

用化学还原沉积法制备了Ni-Fe-B／MCM-41负载型非品态合金催化材料。通过XRD,FT-IR,TPR,SEM,TG及BET研究了非晶态合金对介孔分子筛载体结构的影响及非晶态合金负载后性质和形态的变化。结果表明：非晶态合金没有破坏介孔分子筛的结构,Ni-Fe-B／MCM-41的热稳定性和氧化能力与Ni-Fe-B相比,均有一定提高。