高结构导电炭黑填充硅橡胶复合材料的性能

研究了导电炭黑（ＨＧ－ＣＢ）的高结构对乙烯基甲基硅橡胶（ＶＭＱ－１１０）复合材料电性能和机构性能的影响。由ＴＥＭ观察看出,随ＨＧ－ＣＢ用量增加,其在硫化胶中形成的导电网络逐渐完善,用量达１９份（质量份,下同）时已形成完整的导电网络,导电机理可用电子隧道效应来解释,同时随ＨＧ－ＣＢ填充量增加,复合材料的拉伸强度、硬度增大,但对ＶＭＱ－１１０的硫化有影响。欠硫现象严重,ＨＧ－ＣＢ的用量一般控制在１０～１５份,所得硅橡胶复合材料具有较佳的电性能和机械性能。     

淡盐水脱氯工艺改造

前　言离子膜法制碱由于能耗低、产品质量高,已被世界公认为技术最先进和最经济的烧碱生产方法。在离子膜法制碱过程中,进入离子膜电解槽的２９０～３１０ｇ／Ｌ的二次精制盐水,在直流电作用下经过电解反应,约有５０％的氯化钠被分解,成为含氯化钠２１０ｇ／Ｌ左右的淡盐水流出电槽。淡盐水被电解产生的氯气所饱和,含有大量游离氯,在正常操作下,１Ｌ淡盐水中溶解约有３００ｍｇ左右的氯。游离氯的存在将会产生下列危害：腐蚀管道、贮槽、机泵等设备;氧化盐水过滤器的碳素烧结管;破坏盐水二次精制的螯合树脂的结构;次氯酸根离子会…     

乙烯基硅烷偶联剂

介绍了乙烯基硅烷偶联剂的种类、物性、合成、用途及使用工艺 ;重点介绍了乙烯基三氯硅烷的合成方法。     

Improving the Mechanical Properties of Mg-Gd-Y-Ag-Zr Alloy via Pre-Strain and Two-Stage Ageing

In this study, we investigated the effects of single-stage ageing (SSA), two-stage ageing (TSA), 2% pre-strain + single-stage ageing (P2%SSA) and 2% pre-strain + two-stage ageing (P2%TSA) on the mechanical properties of as-extruded Mg–8Gd–3Y–0.5Ag–0.5Zr alloy (E alloy). Compared with the SSA treatment, the TSA treatment increased the number density of $\beta ^{\prime}$ phase. The P2%SSA and P2%TSA treatments generated the $\gamma ^{\prime}$ phase and chain-like precipitates in addition to the $\beta ^{\prime}$ phase. The contributions of these ageing treatments to the alloy strengthening can be ranked as P2%TSA > P2%SSA > TSA > SSA, because the increments in the tensile yield strength were estimated to be 199 MPa > 148 MPa > 144 MPa > 110 MPa. Different from the traditional strengthening of $\beta ^{\prime}$ phase in the E + SSA and E + TSA alloys, the composite precipitates comprising the $\beta ^{\prime}$ phase, $\gamma ^{\prime}$ phase and chain-like precipitates in the E + P2%SSA and E + P2%TSA alloys provided better combined strengthening effect. The $\beta ^{\prime}$ phase was still dominated in the strengthening effect of the composite precipitates. Owing to the higher number density of $\beta ^{\prime}$ phase in the composite precipitates, the E + P2%TSA alloy exhibited the better mechanical performance as compared with the E + P2%SSA alloy. Finally, the E + P2%TSA alloy had the ultimate tensile strength of 452 MPa, the tensile yield strength of 401 MPa and elongation to failure of 3.3%.     

Thermo-Calc based multi-component micro-segregation model and solidification paths calculations

On the basis of a multi-length scale modeling,a mixture-averaged multi-component/multiphase microsegregation model was proposed without pre-set function for the micro-scale solute profile.The model exp...     

MAN L27/38系列曲轴锻件TR镦锻工艺设计与生产实践

分析了影响曲轴锻件曲拐成形质量的主要因素,通过7L27/38P曲轴锻件TR镦锻工艺设计、优化与生产实践,验证了所采用的工艺方案是合理的、有效的,确保了MAN L27/38系列曲轴锻件的国产化和批量生产.     

Structure and magnetostriction of Tb0.4Nd0.6(Fe0.8Co0.2)1.90 alloy prepared by solid-state synthesis

Mechanical alloying (MA) and subsequent solid sintering process was used to prepare the Nd-containing magnetostrictive Tb0.4Nd0.6(Fe0.8Co0.2)1.90 alloy. The structure, thermal stability and phase transformation were investigated as functions of composition, milling process and annealing temperature. An amorphous phase was formed by high-energy ball milling for 5 h with the ball-to-powder weight ratio of 20:1, which crystallized into MgCu2-type and PuNi3-type crystalline structure with different annealing temperatures. The magnetoelastic properties were investigated by means of a standard strain technique. The high Nd-content (Tb,Nd)(Fe,Co)2 Laves phase for the composition Tb0.4Nd0.6(Fe0.8Co0.2)1.90 was synthesized by MA process plus annealing at 500 ℃ for 30 min.     

UPLC-MS-MS测定红茶中的茶黄素含量

建立了一种快速测定红茶中4种茶黄素(茶黄素、茶黄素-3-没食子酸酯、茶黄素-3'-没食了酸酯和茶黄素-3,3'-双没食了酸酯)的超高效液相色谱串联质谱的分析方法。样品用70%的甲醇水浴提取,采用Waters ACQUITY BEH C18色谱柱分离,串联四级杆质谱多反应离子监测,外标法定量;色谱系统流速为250μL/min,柱温为30℃,流动相为0.1%甲酸和乙腈,梯度洗脱。结果表明,4种茶黄素在检测范围内线性关系良好,相关系数大于0.995,平均回收率在91.95%~105.37%之间,RSD(n=5)在2.37%~4.03%;方法的检出限在13.2~19.1 ng/m L,方法的定量限在39.7~52.6 ng/m L。所测红茶茶黄素含量为3.32 mg/g、茶黄素-3-没食子酸酯含量为1.96 mg/g、茶黄素-3'-没食了酸酯含量为1.48 mg/g、茶黄素-3,3'-双没食了酸酯0.70 mg/g,茶黄素总量为0.75%。该检测方法能快速检测红茶中的茶黄素含量,能有效分析评价红茶的品质,合理控制红茶生产质量。     

原苏联无缝钢管生产及厂家介绍（下）

介绍了乌克兰、格鲁吉亚、阿塞拜疆三国的钢管生产厂及生产现状的考察概况。     

金属玻璃Pd－Cu－Si的耐磨特性

用Ｘ－射线衍射研究Ｐｄ－Ｃｕ－Ｓｉ合金玻璃丝和Ｎｉ－Ｐ非晶态镀膜摩擦付的结构，及其滑动磨损特性，表明负荷对磨损影响很大，磨损试验中，硬度没有增加。还探讨了磨损机制。