非离子乳液型干强剂的研制

本文研究了以丙烯酸甲酯(MA)、苯乙烯(St)、丙烯酰胺(AM)及丙烯腈(NA)为原料,采用核壳技术制取非离子乳液PMAA纸张干强剂的方法.将PMAA乳液加到草浆中,通过对纸张的环压强度,耐破度和撕裂度等的测定,发现当乳液用量为0.75%～1.0%时,可使纸张抗拉强度提高29.4%,耐折度提高96.4%,环压强度提高36.8%.     

聚酰胺聚胺环氧氯丙烷造纸湿强剂的合成

聚酰胺聚胺环氧氯丙烷树脂 (PAE)属于一种热固性树脂 ,是在酸性、中性、碱性条件下均可使用的湿强剂。探讨了通过控制产品的聚合度和支化度 ,使之达到使用要求     

提高水力机械抗磨蚀性能的喷丸工艺数值分析

针对流体机械磨蚀特点,对喷丸工艺引起的残余应力场进行数值模拟。运用有限单元法对弹丸撞击后钢板材料表面应力分布进行了数值计算。讨论了弹丸直径、喷射速度与残余应力的关系,选择几组典型参数比较,分析不同情况下喷丸对局部变形的影响,进而探讨了水力机械防磨蚀的喷丸强化工艺参数的选择。     

Ce在钼合金中的存在形态及其对力学性能的影响

实验研究了稀土元素Ce在钼丝制备过程中的存在形态以及对其性能的影响。结果表明,在通过MoO2粉末和Ce(NO3)3溶液的固-液掺杂、还原获得的Mo-Ce合金粉末中,Ce元素以CeO2形态存在;在烧结坯中,较大尺寸的CeO2质点分布于晶界,较小尺寸的CeO2质点分布于晶内;在丝材成形过程中,晶内CeO2质点逐渐变形为纤维状,晶界CeO2质点仍呈球状,未发生变形。CeO2的存在不但细化了钼粉,同时弥散分布在烧结坯基体中,起到了一定的韧化作用。对不同Ce含量的Mo-Ce合金而言,CeO2存在形式有所不同,导致其塑性有所差异。     

Mo-La2O3复合材料微观结构与力学性能的研究

采用X射线衍射仪(XRD),扫描电子显微镜(SEM),维氏硬度计,电子万能材料试验机,动态热模拟机研究了稀土钼复合材料的结构、形貌、硬度、断裂韧性、高温屈服强度、强韧化机理等。结果表明:在钼中添加适量的La2O3,可起到室温强韧化和高温强化作用。随着La2O3含量的增加,样品的硬度、断裂韧性呈先增后减的规律,其最大值分别为l0.85 GPa7,.25 MPa.m1/2。该材料的强化机制为细晶优化和晶界强化;韧化机制为细晶韧化,裂纹偏转、微桥接和弯曲韧化。     

Explore the Strengthening Mechanisms of the Ultra-Low Carbon and Low Alloy Steel

Room temperature tensile tests were carried on the hot-rolled state ultra-low carbon and low alloy cabainite and martensite steels which were get by different finishing temperatures and different cooling methods.We used the Scanning Electron Microscopy (SEM),Electron Backscattered Diffraction (EBSD) and X-Ray Diffractometer (XRD) to identify the metallographic structure and analyse the precipitated phase.The inherent mechanism of high strength of ultra-low carbon and low alloy bainite and martensite steels was discussed,and the analysis indicated that the reinforcement of ultra-low carbon and low alloy bainite and martensite steels was mainly produced by the superposition of the dislocation strengthening,solution strengthening and grain refinement strengthening.     

Recent Development and Applications of V Microalloying Technology in China

This paper reviews recent developments of V microalloying technology and its applications in HSLA steels.Enhanced-nitrogen in V-containing steel promotes precipitation of fine V(C,N) particles,and improves markedly precipitation strengthening effectiveness of vanadium,therefore,there is a significant saving of V addition in the same strength requirement.Vanadium can be used effectively for ferrite grain refinement by the nucleation of intragranular ferrite promoted by VN precipitates in Austenite.The combination of intragranular ferrite (IGF) on VN particles and the recrystallization controlled rolling (RCR) technology realize the grain refinement in V-containing steel.V-N process is a cost-effective way for high strength rebars,forging steels and thin slab direct rolling strips.     

阳离子无皂乳液增强剂的合成及应用

采用功能单体引入法无皂聚合工艺合成了一系列阳离子聚丙烯酸酯乳液造纸增强剂,对主要合成条件如共聚单体组成、阳离子单体比例、反应温度、引发剂用量等进行了优化,此条件下产物可使漂白麦草浆纸页与空白样相比抗张指数、环压指数分别提高16.0%、17.8%.     

防水铜版纸生产工艺的优化

本文深入探讨了打浆度、松香胶用量、湿强剂用量对生产防水铜版纸的影响,在此前研究的基础上以提高打浆度为延伸实验对生产工艺进行优化,结果表明生产防水铜版纸的较佳工艺条件是:针叶木浆与阔叶木浆的配比7:3;打浆度37.0°SR;松香胶用量3.0%(对绝干浆);PPE湿强剂用量1.0%(对绝干浆).