5Cu/(10NiO-NiFe2O4)金属陶瓷惰性阳极钠钾混合电解质电解腐蚀研究

采用传统粉末冶金技术制备了铝电解用5Cu/(NiFe2O4-10NiO)金属陶瓷惰性阳极,对其在钠钾冰晶石混合冰晶石中进行电解腐蚀。研究结果表明,从微观来看,阳极存在腐蚀现象。电解过程的槽电压波动剧烈。Fe、Ni和Cu组元的平衡浓度分别为150×10-6、42×10-6及40×10-6,腐蚀速率比常规电解条件下的低。     

NiFe2O4基金属陶瓷惰性阳极腐蚀组元在电解质中的传质研究

通过计算铝电解用NiFe2 O4基金属陶瓷惰性阳极腐蚀组元Fe、Ni和Cu在铝电解质中的传质系数,讨论了不同过热度下不同阳极腐蚀组元在电解质中的传质行为.结果表明,过热度对不同腐蚀组元的影响不明显,Cu的抗腐蚀性能最好,Ni次之,而Fe最差.     

极片压实密度对双电层电容器电化学性能的影响

以商品化的活性炭为原料,采用部分锂离子制造工艺,制备了2.7V40F有机系软包装双电层电容器,研究了极片的压实密度对双电层电容器的容量、等效串联电阻、漏电流以及循环性能的影响,并对制备的双电层电容器进行了性能测试。结果表明:当极片压实密度为600mg/cm3时,双电层电容器在1000mA放电电流时,电容器的能量密度为6.98W·h/Kg,经过2.7V恒压30min后,电容器漏电流为0.4mA,循环1000次后容量保持率为95.02%。     

Electrical conductivity of （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts

The effects of contents of AlF3 and Al2O3, and temperature on electrical conductivity of （Na3AlF6-40%K3AlF6）- AlF3-Al2O3 were studied by continuously varying cell censtant （CVCC） technique. The results show that the conductivities of melts increase with the increase of temperature, but by different extents. Every increasing 10 ℃ results in an increase of 1.85 × 10^-2, 1.86× 10^-2, 1.89 × 10^-2 and 2.20 × 10^-2 S/cm in conductivity for the （Na3AlF6-40%K3AlF6）-AlF3 melts containing 0%, 20%, 24%, and 30% AlF3, respectively. An increase of every 10 ℃ in temperature results an increase about 1.89× 10^-2, 1.94 × 10^-2, 1.95 × 10^-2, 1.99× 10^-2 and 2.10× 10^-2 S/cm for （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts containing 0%, 1%, 2%, 3% and 4% Al2O3, respectively. The activation energy of conductance was calculated based on Arrhenius equation. Every increasing 1% of AlF3 results in a decrease of 0.019 and 0.020 S/cm in conductivity for （Na3AlF6-40%K3AlF6）-AlF3 melts at 900 and 1 000 ℃, respectively. Every increase of 1% Al2O3 results in a decrease of 0.07 S/cm in conductivity for （Na3AlF6-40%K3AlF6）-AlF3-Al2O3 melts. The activation energy of conductance increases with the increase in content of AlF3 and Al2O3.     

Electrical conductivity of (Na_3AlF_6-40%K_3AlF_6)-AlF_3-Al_2O_3 melts

The effects of contents of AlF3 and Al2O3,and temperature on electrical conductivity of (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 were studied by continuously varying cell constant (CVCC) technique.The results show that the conductivities of melts increase with the increase of temperature,but by different extents.Every increasing 10 ℃ results in an increase of 1.85×10-2,1.86×10-2,1.89×10-2 and 2.20×10-2 S/cm in conductivity for the (Na3AlF6-40%K3AlF6)-AlF3 melts containing 0%,20%,24%,and 30% AlF3,respectively.An increase of every 10 ℃ in temperature results an increase about 1.89×10-2,1.94×10-2,1.95×10-2,1.99×10-2 and 2.10×10-2 S/cm for (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts containing 0%,1%,2%,3% and 4% A12O3,respectively.The activation energy of conductance was calculated based on Arrhenius equation.Every increasing 1% of AlF3 results in a decrease of 0.019 and 0.020 S/cm in conductivity for (Na3AlF6-40%K3AlF6)-AIF3 melts at 900 and 1 000 ℃,respectively.Every increase of 1% Al2O3 results in a decrease of 0.07 S/cm in conductivity for (Na3AlF6-40%K3AlF6)-AlF3-Al2O3 melts.The activation energy of conductance increases with the increase in content of AlF3 and Al2O3.     

Na3A1F6-K3A1F6-A1F3熔体的电导率研究

通过连续改变电导池常数法（CVCC）,用自制的电导率测试装置研究KCl溶液与熔融KCl的电导率。实验证明连续改变电导池常数法能满足于一般的科学实验要求,自制的电导率测试装跫能满足常温实验和高温实验的电导率测试要求。通过此装置测定了钾冰晶石在（Na3AlF6＋K3AlF6）熔体中的含量为40％,AlF3在（Na3AlF6＋K3AlF6＋AlF3）混合熔体中的含量分别为0、20％、24％和30％的电导率,实验还讨论了AlF3含量对电导率的影响。     

La2O3对TA2钛电解渗硼的影响

以无水硼砂为渗硼剂、K₂CO₃为活化剂、B₄C为供硼剂、La₂O₃为添加剂,对TA2金属钛进行电解渗硼,研究La₂O₃对渗硼层形貌的影响。结果表明,硼化层由表面层的TiB2和次外层的TiB晶须组成。在相同渗硼工艺条件下,不添加La₂O₃时,TiB晶须长度为92.61 μm,TiB2厚度为6.38 μm; 添加5%、10%和15%La₂O₃后,TiB晶须长度分别为100.39、121.65和144.83 μm,TiB₂厚度分别为5.83、5.28和5.30 μm,La₂O₃的加入促进了TiB晶须的生长,但降低了TiB₂层厚度。     

钛金属熔融Na_2B_4O_7硼化:热力学和动力学过程

以无水硼砂为硼化剂在金属钛表面进行硼化,通过XRD分析样品表面的物相组成。结果表明,当温度为900℃时,钛金属表面主要生成Na0.23TiO,基本没有硼化物生成;当温度升高到950℃时,钛金属表面只生成少量的硼化物;而当温度高于950℃时,钛金属表面有明显的硼化物生成。随着温度的升高,硼化物种TiB2的量增多,而TiB量减少。热力学分析表明,随着温度的升高,生成TiB2和TiB的趋势应该降低,这与实验结果相矛盾。根据Sar-ma的B原子在金属钛中的扩散动力学,由于低温时B原子在TiB中的扩散速度大于其在TiB2和Ti中的扩散速度,故能同时生成TiB2和TiB;而高温时由于B在Ti中的扩散速度大于其在TiB中的扩散速度,主要生成TiB2,而TiB的生成受到抑制。     

LiF对Na_3AlF_6-K_3AlF_6-AlF_3熔体初晶温度和Al_2O_3溶解度的影响

采用步冷曲线法测定Na3AlF6-K3AlF6-AlF3-LiF熔体的初晶温度,采用旋转刚玉片质量损失法测定Al2O3在Na3AlF6-K3AlF6-AlF3-LiF熔体中的溶解度。结果表明:当LiF添加量在0～4%范围内时,每添加1%LiF使Na3AlF6-K3AlF6-AlF3熔体的初晶温度降低3～4.7℃,小于Na3AlF6-AlF3熔体中添加LiF后初晶温度的影响;在0～3%的范围内,每添加1%LiF将使Al2O3在Na3AlF6-K3AlF6-AlF3熔体中的溶解度降低0.23%～0.55%。