合理选用模具材料 提高塑料模具的使用寿命

本文简要介绍了塑料模具的工作条件及其失效因素和模具钢的基本要求，并在此基础上详细阐述了常用塑料模具材料；最后，展望了我国塑料模具材料的发展。     

浅析塑料模具钢的合理选择

模具材料对于模具的加工质量和使用性能，以及模具寿命有很大的影响。归纳了影响塑料模具钢选择的主要因素，在此基础上，提出了塑料模具钢选择的原则和方法。     

浅析塑料模具钢的合理选择

模具材料对于模具的加工质量和使用性能，以及模具寿命有很大的影响。归纳了影响塑料模具钢选择的主要因素，在此基础上，提出了塑料模具钢选择的原则和方法。     

塑料模具材料选用原则及应用

对塑料模具材料的选用原则和新型模具材料进行了简要的介绍，在此基础上，以成型手机外壳塑料模具为例，对其关键零部件的选材应用进行了主要说明。     

计算机技术在塑料模具设计中的应用——评《模具设计及计算机应用》

新形势下,随着计算机技术、工业制造技术的快速发展,计算机技术与塑料模具设计工艺相结合,已成为当前及未来塑料模具行业发展的主要趋势之一。塑料模具设计是实现塑料材料应用的前提,建立在工业制造体系、材料运用方法、计算机技术层面上。通过使用计算机技术,搭建自动化、智能化、精准化的塑料模具设计平台,能够控制塑料模具结构、尺寸、精密度、零部件等要素,促进塑料材料的成型与应用。     

塑料模具材料的种类及前景

综述了塑料模具用钢材料的性能要求和塑料模具用钢材料的种类及选择,并对其今后的发展提出了一些展望。     

国产塑料模具在高压注浆成形鱼盘中的应用

介绍了高压注浆成形鱼盘用塑料模具的结构、制作及应用情况。该模具能在引进的高压注浆机上成功使用，证明国产塑料模具使用性能符合要求，可替代进口模具材料。     

浅谈塑料模具的发展现状

模具是工业的重要工艺装备，是许多工业产品生产中不可缺少的组成部分。模具是利用其特定形状去成型具有一定型状和尺寸的制品的工具，按制品所采用的原料不同，成型方法不同，一般将模具分为塑料模具，金属冲压模具，金必压铸模具，橡胶模具，玻璃模具等。在高分子材料加工领域中，塑料模具优化设计，是当代高分子材料加工领域中的重大课题。塑料作为现代社会经济发展的基础材料之一，是各个经济领域不可缺少的重要材料，模具生产技术水平的高低，已成为衡量一个地区制造水平高低的重要标志。     

塑料模具用钢的合理选择

本文根据塑料模具的使用者和制造者的要求，提出了合理选择塑料模具用钢的方法。     

微孔塑料模具成孔机理及其影响因素

研究用树脂—水—填料系统制备微孔塑料模具材料,对树脂乳液—填料系统的成孔(连通孔)机理进行了系统的研究和探讨,提出了微通孔塑料模具材料的性能测试方法,并对成孔过程中的各种影响因索进行了分析讨论。     

EVA／PE发泡材料的研制

通过对ＥＶＡ／ＰＥ发泡体系各原料的分析选择,在现有的实验室条件下,找出ＥＶＡ／ＰＥ发泡材料的较佳配方及工艺条件,此发泡材料可做为鞋用材料。     

压电材料的结构及其性能研究

本文从功能陶瓷开始,介绍了压电材料的演化过程,压电材料的分类及其结构构成。举例说明了常见的压电材料,对压电材料的结构和性能作了初步的分析,指出了压电材料发展中存在的问题并展望了压电材料的发展方向。     

基于数据库的陶瓷材料计算机辅助设计

根据已知文献的数据建立了陶瓷材料性能和组分数据库 ,开发了管理和操纵该数据库的应用程序 ,利用该程序可以查询已知陶瓷材料系统性能与组分的关系 ;建立了基于该数据库的人工神经网络预测模型 ,通过操纵陶瓷材料数据库中相关数据 ,并结合人工神经网络预测模型程序可以预测未知材料系统在给定性能条件下的各相组分 ,预测了Al2 O3 (W ,Ti)C陶瓷材料在两种目标性能下的组分 ,并计算了其预测误差 ,结果表明 ,其实验值与预测值较为吻合。     

食品包装材料--塑料薄膜的发展

简述了近几年食品包装材料—塑料薄膜的发展,通过分析各种食品的特性,选择最能满足该食品要求的包装材料,介绍了几种具有特殊功能的食品包装材料,指出今后我国塑料包装材料的发展方向。     

The effect of moisture on the dynamical mechanical properties of bacterial cellulose/glucuronoxylan nanocomposites

The plant cell wall possesses unique material properties due to its hierarchical organisation. In order to biomimic a native structure like a plant cell wall, a model system consisting of microfibrillar cellulose, produced by the gram-negative bacteria Acetobacter xylinum, and a glucuronoxylan matrix derived from aspen holocellulose was constructed. The glucuronoxylan was extracted from delignified aspen (Populus tremula) wood chips using DMSO to preserve its native chemical composition. Dynamic mechanical analysis (DMA) measurements performed with moisture scans showed a moisture-induced softening of delignified aspen wood fibres due to the plasticization of glucuronoxylan. A similar result was observed for the model system. However, the softening behaviour of the delignified aspen fibre and the model system was not identical, most probably due to differences in spatial organisation of the components. Dynamic FTIR-studies indicated that interactions between the cellulose and the glucuronoxylan exist in the aspen holocellulose while the components in the nanocomposite appear to be more isolated.     

陶瓷热障涂层在化工过程装备中的应用

针对化工生产中的易氧化、高温腐蚀和易磨损等因素,提出适用于化工过程装备的材料体系设计方案。在方案中将材料设计思路创造性地应用到陶瓷热障涂层,提出了对其进行结构设计的总体思路,并对主要设计参数的设计方法进行了初步研究。     

Effect of material properties on residual stress distribution in thermal barrier coatings

Residual stress has a significant influence on the crack nucleation and propagation in thermal barrier coatings (TBC) system. In this work, the residual stress in the air plasma spraying (APS) TBC system during cooling process was numerically studied, and the influence of the material properties of each layer on the residual stress was investigated. The morphologies of the interface were described by a piecewise cosine function, and the amplitude for each segment gradually increases. The elasticity, plasticity and creep of top coat (TC), thermally grown oxide (TGO) layer and bond coat (BC) were considered and the elasticity and creep of the substrate layer were taken into account. The material properties of all layers vary with temperature. The results show that the material properties have complex influence on the residual stress during cooling. The effect of the material properties of TC and BC on the residual stress at the interface is relatively large, and that of TGO and substrate is relatively small. These results provide important insight into the failure mechanism of air plasma spraying thermal barrier coatings, and important guidance for the optimization of thermal barrier coating interfaces.     

国内热收缩材料研究和产业化的进展

综述了国内热收缩材料的发展概况。分析了其热收缩机理，介绍了国内交联聚乙烯、乙烯／乙酸乙烯酯共聚物、含氟聚合物等热收缩材料的研究现状和热收缩材料产业化的发展情况；并对热收缩材料的发展前景进行了展望。     

Polymer degradation initiated via infectious behavior

Understanding polymer degradation phenomena is of critical importance for material reliability. A novel dual stage chemiluminescence detection system has been developed and applied to probe for material interaction effects during polymer degradation. Evidence is presented for the first time that in an oxidizing environment a degrading polymer A (in this case polypropylene, PP) is capable of infecting a different polymer B (in this case polybutadiene, HTPB) over a relatively large distance. In the presence of the degrading material A, the thermal degradation of polymer B is observed over a significantly shorter time period. Infectious intermediate volatiles from material A are able to initiate and shorten the degradation processes in material B. This observation documents infectious behavior that will have significant consequences for materials interactions, understanding material degradation processes and long-term aging effects in combined material exposures.     

Investigation of material flow behaviour and chip formation mechanism during grinding of glass-ceramics by nanoscratch

Material flow analysis is important for revealing the mechanisms of chip formation and material removal in ductile regime machining of glass-ceramics. However, the analysis is limited by a lack of elastic–plastic stress field modelling of the scratch process. Therefore, this paper proposes an analytical stress field model of material flow for glass-ceramics to reveal the material removal mechanism at a microscale. This model includes the grit tip radius and nominal rake angle, which have a significant effect on material flow. Theoretical analysis results show that the material flow direction and chip formation depend on the relative grit sharpness. With greater relative grit sharpness, more material flows upwards and a chip is easily formed owing to the smaller effective rake angle, whereas less relative grit sharpness results in a larger effective rake angle such that all the material flows downwards and no chip is formed. To validate the proposed model, a taper nanoscratch experiment was conducted. The experimental and theoretical results are in good agreement. These findings of material flow behaviour can help predict chip formation and achieve the ductile regime grinding of glass-ceramics.