PcBN刀具硬态干切削条件对切屑形貌的影响

通过对PcBN刀具硬态干切削GCr15轴承钢的试验研究,观察分析研究了不同切削条件对切屑形貌的影响.结果表明,随着切削速度的增加,切屑锯齿化程度也越高,当切削速度大于200m/min时,切屑类似于挤裂状;随着进给量的增加,切屑的锯齿化程度越来越明显,且在进给量达到0.5mm/r时,切削产生严重变形;随着背吃刀量的增加,切屑的卷曲程度越大,但对锯齿化影响并不大,但当背吃刀量为0.05mm时,切削基本呈带状.     

Measuring flake orientation for metallic coatings

Metallic and pearlescent coatings, very popular in automotive applications, contain flake shaped pigments. The orientation distribution of these flakes inside the effect coatings determines to a large extend the color and visual appearance of the coating. Unfortunately the measurement of flake orientation distributions is far from straightforward. The two main current techniques use analysis with light microscopy on cross cuts, and confocal microscopy.We used both techniques on a large set of samples. A set of 117 metallic coatings were analyzed, where we varied the concentration of metallic pigment, the concentration of so-called disorienting agent and the type and size of metallic pigment. Trends that for a long time have been assumed to be true were now unambiguously proven true, and can now be stated in a quantitative manner. For example, large flakes generally show better orientation than small flakes. For waterborne cornflake pigments, we measured an orientation width of 19.4° for flakes with a median diameter of 16 μm, and only 7.2° for flakes with a median diameter of 35 μm. Surprisingly we found only a small effect on flake orientation when disorienting agent was added to a color formula.     

新型钛系催化剂合成瓶用聚酯切片的研究

采用均一的液相新型钛系催化剂STi C-B1,在2 L间歇式聚合反应釜中制备钛系瓶用聚对苯二甲酸乙二醇酯(PET)切片;考察了催化剂中主要成分对PET切片色相及乙醛含量的影响,以及不同催化体系的PET切片的结晶性能及热性能;并进行了工业化应用评价。结果表明:在相同的聚合工艺条件下,STi C-B1钛用量为5μg/g(相对于PET)时的催化活性及其所得PET切片乙醛含量与乙二醇锑锑用量为180μg/g时相当;钛系PET切片结晶速度较锑系PET切片的慢,较慢的结晶速度可避免PET切片降温时出现结晶过快,从而有利于吹瓶;工业化应用表明钛系PET瓶片质量指标基本达到锑系PET瓶片的水平,其瓶坯乙醛含量低于锑系PET瓶坯的乙醛含量。     

锌薄片抗腐蚀涂层

目前,在文献和专利中已经有大量的基于锌/铝薄片制成的锌粉涂料和富锌涂层体系的报道.本文主要评述了基于溶剂或水基配方的现代锌片涂料,并讨论了添加剂和涂料组分对材料性能的影响.     

片碱除尘技术探讨

介绍了片状氢氧化钠生产过程中碱尘产生的原因、造成的危害,阐述了自然引风除尘和旋风喷淋水吸收除尘方法存在的优缺点。     

可提高胶料耐渗透性能的玻璃片状颗粒

将玻璃片状颗粒加入胶料中。经过测试发现,玻璃片状颗粒能提高氯丁橡胶的耐水蒸气渗透性能和提高丁腈橡胶的耐油渗透性能。     

Film shrinkage and flake orientation

In metallic coatings, flakes tend to orient themselves parallel to the substrate. The physical mechanism behind this orientation effect is often thought to appear mainly by film shrinkage during solvent evaporation.     

造纸专用片状沉淀碳酸钙的制备

通过大量实验并从理论上探讨了氧化钙原料、石灰乳浓度、二氧化碳流量、温度、晶形控翻剂及其加入量和加入时间等因素对制备造纸专用片状沉淀碳酸钙的影响，确定了较理想的工艺条件。制备出分散性良好的平均粒径为0．6μm的造纸专用片状碳酸钙。     

Corrosion protection coating containing polyaniline glass flake composite for steel

Corrosion protection of steel by glass flake (GF) containing coatings is widely used in marine atmosphere. Even though, the coatings containing glass flake are highly corrosion resistant, their performance is decreased due to the presence of pinholes and coating defects. It is well established that polyaniline containing coating is able to protect the pinhole defects in the coatings due to passivating ability of polyaniline. Hence a study has been made on the corrosion protection ability of steel using polyaniline-glass flake composite containing coating with 10% loading of glass flake in epoxy binder. The polyaniline glass flake composite (PGFC) was synthesized by chemical oxidation of aniline by ammonium persulphate in presence of glass flake. The corrosion protection ability of GF and PGFC containing coating on steel was found out by salt spray test and EIS test in 3% NaCl. In both the tests, the resistance value of the PGFC containing coating has remained at 10⁸-10⁹ Ω cm² where as for the GF containing coating, the resistance values decreased to 10⁵ Ω cm². The enhanced corrosion protection ability of the PGFC containing coating is due to the passivation ability of the polyaniline present in the coating.     

片碱机的设计

介绍了片碱机的结构特点,对其作用原理进行了分析和探讨,最后提出了部分改进 措施。     

氢氧化钾片碱生产的技术改造

介绍了影响氢氧化钾生产的原因，对部分工艺操作进行了完善，对氢气系统、制片系统提出了切实可行的技术改造方案。     

玻璃鳞片导电涂料的研究

以自制的化学镀银鳞片石墨对传统的无溶剂型环氧玻璃鳞片涂料进行改性,制得了玻璃鳞片导电涂料。研究了含不同质量分数化学镀银鳞片石墨的玻璃鳞片导电涂层的电阻、表干/实干时间、厚度、硬度、耐蚀性及其BSE照片。结果表明,含有化学镀银石墨的玻璃鳞片涂料其表干/实干时间缩短、厚度增加、硬度和耐蚀性均有所提高。确定了化学镀银鳞片石墨在涂料中的最佳质量分数为30%。所得玻璃鳞片导电涂料的电阻率为252.75Ω·cm。     

片碱生产中质量影响因素的探讨

探讨了KOH片碱生产过程中，影响产品质量的关键性因素及技术改进措施，通过改进有效地提高了产品质量的稳定性及片碱的合格率。