含氟烧结矿硅酸盐粘结相自身的强度

 以包钢含氟烧结矿的粘结相为研究对象,考察了粘结相自身的抗折、抗压强度随粘结相组成的变化规律。通过改变粘结相的碱度以及MgO、CaF2和FeO的含量测得了不同粘结相的抗折、抗压强度。结果表明,碱度低于14时,碱度增加使粘结相的抗折、抗压强度增加,碱度高于14时,粘结相粉化严重;添加MgO使粘结相抗折、抗压强度下降;添加少量CaF2能提高粘结相的抗折、抗压强度;FeO的质量分数为386%时,粘结相的抗折、抗压强度最高。     

有氧条件下水分对硫腐蚀产物自燃性的影响

以Fe2O3为例,模拟含硫油品储罐中硫化氢气体在有氧条件下的硫化及氧化反应,测定氧化过程中试样温度变化评价硫化产物的自燃性,考察Fe2O3试样含水率对硫腐蚀产物自然性的影响。结果表明,水是影响Fe2O3试样硫化产物自燃性的重要因素;试样含有少量水时自燃性最高,干燥试样或含水率过高硫腐蚀产物的自燃性较小;在相同含水率下,混合气体中氧气体积分数越高,硫腐蚀产物的自燃性越低。     

EFFECTS OF Pb COMPOUND ADDITIVES ON THE PROPERTIES OF YBa2Cu3O7-δ

The melting temperature and critical transition temperature T, of YBa2Cu3O7-δ with deferent content additives of PbO and BaPbO3 were studied. When PbO was doped in YBa2Cu3O7-δ the melting temperature of YBa2Cu3O7-δ was reduced, however its superconductivity was weakened. From the XRD pattern of the sintered mixture of YBa2Cu3O7-δ and PbO, it was known that there was a reaction between YBa2Cu3O7-δ and PbO, and the product was BaPbO Hence different contents of BaPbO3 (10mass%, 20mass% and 30mass% ) were added in YBa2Cu3O7-δ It was proved that there were no reactions between YBa2Cu3O7-δ and BaPbO3.And the superconductivity of the mixtures was much better than that of the samples with PbO additive.     

B4C/Al复合材料力学性能及其断裂机理的研究

对无压浸渗法制备的B4C/Al复合材料进行了力学性能测试。结果表明,B4C/Al复合材料的抗弯强度和断裂韧性与单一B4C材料相比有显著提高。B4C/Al复合材料的抗弯强度及断裂韧性分别比单一B4C提高了18.39%和75.27%,但其硬度降低。B4C/Al复合材料经扫描电镜和背散射仪分析后发现,无压浸渗法制备的B4C/Al复合材料中没有大尺寸的显微缺陷,组织分布比较均匀、致密;B4C以连续的骨架结构存在,而渗入的铝相也以连续基体的形式存在;单一B4C存在较多的穿晶断裂,而B4C/Al复合材料的断裂方式主要以沿晶断裂为主,这是B4C/Al复合材料断裂韧性提高的主要原因。     

Ca增粘熔体发泡法制备闭孔泡沫铝的研究

研究了熔体发泡法制备闭孔泡沫铝过程中,金属钙对熔体的增粘机理以及不同钙加入量对闭孔泡沫铝孔隙率的影响。发现加入金属Ca并搅拌均匀后,主要生成金属间化合物CaAl4和CaAl2,在熔体中弥散存在,且CaAl4熔点(697℃)高于制备泡沫铝的试验温度(680℃),处于半熔化状态,因此增加了铝熔体粘度。试验近一步证实,纯铝中金属钙的加入量对闭孔泡沫铝孔隙率有很大影响,当加入量为2.5%制备所得的泡沫铝的孔隙率最高。     

直馏柴油非临氢降凝研究

采用水合法制备非临氢降凝催化剂FC-DB,以抚顺石化公司石油二厂直馏柴油为原料评价其使用性能,考察反应温度与空速对柴油收率及凝点的影响,采用多元二次回归方程确定柴油收率及凝点与操作条件的关系,用优化的方法确定出适宜的操作条件。结果表明,在反应温度310℃,空速1.0h-1的条件下,柴油收率为94.61％,凝点从22℃下...     

Preparation and characterization of Luminescent nanostructured Gd2O3-Y2O3:Eu synthesized by the solution combustion process

Microwave-assisted combustion of Europium doped Y₂O₃–Gd₂O₃ was investigated using glycine, glucose, glycerol and citric acid as organic fuel. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) pattern, Brunauer–Emmett–Teller (BET) method, X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL) techniques were used to characterize the nanostructured Gd₂O₃-Y₂O₃:Eu. The average crystallite size was in the range of 15 to 45nm. The formation of sponge-like morphologies was confirmed by SEM-TEM images and optimized with glucose and glycine fuels. Glycine fuel was enhanced specific surface area of synthesized sample (7.11 m²/g) as compared to other organic fuel. Gd 4d, Gd 3d and Y 3d peaks were appeared as a strong XPS signal which indicated complete oxidation of Gd and Y in sample. The main emission peaks of photoluminescence spectra which are related to the electric and magnetic dipole transitions were in ⁵D₀→⁷F₂ (610 nm) and ⁵D₀→⁷F₁ (590nm) electron transitions. Glycine sample as a fuel earned the highest emission intensity of red appearance in CIE diagram by one-step combustion synthesis. Photoluminescence property europium doped Y₂O₃-Gd₂O₃ was improved using glycine as a fuel.     

Fluoride removal capacity of cement paste

The objectives of this study are to assess the feasibility of using the cement paste as an alternative agent for fluoride removal and to investigate fluoride removal capacity of the cement paste. Initially, screening experiments were conducted to evaluate Ca-bearing materials (cement, cement paste, lime). The cement paste was competitive to lime, common fluoride removal agent. Various Ca-bearing hydrates such as portlandite, calcium silicate hydrate (CSH), and ettringite in the cement paste were identified to remove fluoride by precipitating CaF₂ and/or adsorbing F^– ions. In the batch slurry experiments using cement paste and lime simultaneously, 50–67% of lime can be substituted by cement paste to satisfy fluoride effluent limitation of 15 mg/L. Fluoride removal reactions in cement paste slurries were strongly affected by pH, and an optimal pH for the cement paste slurries exists between 7.0 and 11.5. From the result of the column experiment to observe the successive fluoride removal capacity of cement paste, the real hydrofluoric acid wastewater concentration of 1150 mg/L immediately reduced to the level of less than 15 mg/L. These results indicate that the cement paste generally has advantageous characteristics as an economical and viable substitute for lime to remove fluoride.     

A self-powered temperature-sensitive electronic-skin based on tribotronic effect of PDMS/PANI nanostructures

A new self-powered temperature-sensitive electronic-skin (e-skin) for real-time monitoring body temperature without external electricity power was fabricated from patterned polydimethylsiloxane/polyaniline (PDMS/PANI) nanostructures. The e-skin can be feasibly attached on the human body and driven by the mechanical motion energy through triboelectric effect. The outputting triboelectric impulse of the PDMS/PANI units is significantly dependent on the local surface temperature of the e-skin, serving as both the power source and temperature sensing signal. The outputting current of the e-skin increases with increasing surface temperature of the device. Under applied bending deformation, the response of the e-skin is up to 63.6 for 38.6 °C. The e-skin can detect minimum temperature change of 0.4 °C. The working mechanism can be ascribed to the coupling effect of triboelectric and semiconductor properties (tribotronic effect). A practical application of the e-skin attaching on the human body for detecting the body temperature range of 36.5–42.0 °C has been simply demonstrated. This work provides a viable method for real-time monitoring body temperature, and can promote the development of wearable temperature sensors and self-powered multifunctional nanosystems.     

Al-Si闭孔泡沫铝电磁屏蔽效能

通过调整发泡温度、发泡时间、保温时间及发泡剂加入量等工艺参数,采用熔体转移发泡法制备不同相对密度的Al-Si闭孔泡沫铝.利用法蓝同轴法测试其电磁屏蔽效能,结果表明:电磁干扰频率对其屏蔽效能影响显著,在10～600MHz范围内,随着干扰频率增加,泡沫铝屏蔽效能逐渐减小,在600～1500MHz范围内,屏蔽效能又逐渐增加.相对密度对Al-Si闭孔泡沫铝材料电磁屏蔽效能影响不大.