挤出成型多孔陶瓷的性能及应用

主要研究挤出成型多孔陶瓷塑性泥料的制备方法、挤出成型工艺及产品性能评价,详细论述塑性泥料的性能对挤出成型工艺的影响及模具的结构设计对制品的表面状态的影响。     

半干法成型砖坯透气性的研究

本文探讨了多孔体透气性的测定方法。测定了由不同水分和不同物质组成的粘土泥料压制成型的砖坯的透气性系数实验值。查明了指于单纯递减形式的成型砖坯的透气性系数与成型压力之间的实验关系。测定了各种泥料的指数参数。绘制了广泛成型压力范围的透气性系数及气体含量系数的比较图表。     

陶瓷部件挤出成型工艺

本文以蜂窝陶瓷生产工艺为例，讨论了陶瓷部件挤出成型过程中，塑性泥料的制备、成型、干燥和烧成等工艺技术和装备问题。     

尼龙材料的固相成型研究

初步研究了工程塑料尼龙(PA)的挤压成型工艺。实验发现:挤压成型过程中原材料、挤压力、保压时间和成型温度对制品的品质影响较大。提高坯料预热温度和(或)保压时间,可使模压制品的弹性回复明显减小、成型尺寸精度显著提高。     

使用超高分子量聚乙烯滚压头克服飞泥缺陷

本文主要介绍使用超高分子量聚乙烯滚压头代替聚四氟乙烯及金属滚压头,克服了滚压成型因泥料含水量太大而产生的飞泥缺陷.根据我厂生产的实际情况,产生飞泥主要原因是泥料含水量太大,成型的泥料水分超过了21.5-21.8%,泥料在成型时就可能产生飞泥,不能完成生产定额,严重的影响下道工序.     

浅谈脲醛树脂溶液在挤压成型陶瓷绝缘管工艺中的作用

本文介绍了挤压成型工艺制造陶瓷绝缘管的工艺过程，着重阐述了成型坯料所用粘合剂配方的对比实验及影响坯料成型的有关因素。     

浅谈脲醛树脂溶液在挤压成型陶瓷绝缘管工艺中的作用

本文介绍了挤压成型工艺制造陶瓷绝缘管的工艺过程，着重阐述了成型坯料所用粘合配方的对比实验及影响坯料成型的有关因素。     

注浆成型《插芯注浆》法

注浆成型中,对于厚壁制品.尤其是实心的厚制品.通常采用的双面吸浆、单面吸浆,难于保证制品的成型成活率,即使制成的坯体也易出现开裂、分层等弊端.为解决厚制品注浆成型缺陷.仅介绍《插芯注浆法》.一、注浆成型基本原理注浆成型法,即把有良好流动性、厚化性能的料浆,注入到模型中,由模型吸收料浆中的水份,使模型中的料浆逐步失去水份而硬     

等静压成型熔融石英陶瓷的研究

介绍了等静压成型熔融石英陶瓷的技术,研究了水分含量、粒径分布、粘合剂的加入量及烧成温度对制品的成型性能、体积密度、弯曲强度和显气孔率等性能的影响.结果表明:当水分含量在0.3%～1.0%(质量分数)之间,粒径分布为双峰分布,PVA加入量为1.5%,最高烧成温度为1250 ℃时,能成功制备出性能优异的熔融石英陶瓷天线罩.     

氟橡胶O形密封圈预成型优化因素分析

本文对FX-17氟橡胶O形密封圈成型过程中坯料软化、坯料薄通、坯料圈成型等预成型工艺控制与优化进行了分析。试验表明,在氟橡胶一段硫化和二段硫化参数一定的情况下,通过对O形密封圈预成型工艺参数优化,预成型前后橡胶O形密封圈内径、线径、拉伸强度等成型质量和性能波动均降低,预成型工艺优化后可以减少氟橡胶O形密封圈尺寸和拉伸强度波动,能够提升氟橡胶O形密封圈加工成型质量和性能。     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。