陶瓷注射成型粘结剂现状及发展趋势

本文重点介绍了陶瓷注射成型粘结剂的种类，特性及脱脂技术，比较了目前几种粘结剂体系的优缺点，指出了今后粘结剂发展方向和趋势。     

金属注射成型专用粘结剂主体聚合物合成研究

对金属注射成型专用粘结剂的主体聚合物进行了研究 ,结果表明 ,用甲基丙烯酸甲酯与乙酸乙烯酯共聚 ,用偶氮二异丁腈作自由基引发剂 ,用硫醇作分子量调节剂可以获得较理想的粘结剂主体聚合物 ;并考察了各因素对聚合物产率和熔点的影响     

陶瓷注射成型中水萃取脱脂粘结剂体系的相容性研究

提出了陶瓷注射成型水萃取脱脂粘结剂组分相容性的三大判断方法:溶解度参数法、热力学计算法、扫描电子显微镜法,以评判水基注射料的相容性,为陶瓷注射成型水萃取脱脂粘结剂的相容性提供了理论依据以及评判标准。并以聚乙二醇(PEG)/聚乙烯醇缩丁醛(PVB)以及聚乙二醇(PEG)/聚甲基丙烯酸甲酯(PMMA)两个水基粘结剂体系为例进行说明,讨论了陶瓷注射成型粘结剂的相容性对注射料流动性及水萃取脱脂速率的影响。     

陶瓷的注射成型技术及其研究进展

陶瓷注射成型(CIM)是一种可净尺寸成型工艺,适用于体积小、形状复杂、成型精度高的陶瓷结构件。本文介绍了CIM的基本工艺过程,包括陶瓷粉体和粘结剂的选择、混料制备、注射工艺和脱脂工艺。重点阐述了粘结剂的性能及分类、脱脂工艺研究进展以及微注射成型和低压注射成型新技术。最后对陶瓷注射成型的发展趋势进行了展望。     

金属粉末注射成型工艺

将现代塑料注射成型技术引入粉末冶金领域，不但扩大注射成型技术的应用，同时也推动粉末冶金工艺的发展。详细讨论金属粉末注射成型工艺及其应用，对其材料选择，产品与模具的设计、注射成型工艺过程及烧结工艺过程进行了系统的分析，并展望了该工艺中金属粉末、粘结剂、注射成型装备和工艺过程数值模拟软件等方面的发展趋势。     

高分子在陶瓷注射成型中的应用和进展

综述了目前高分子在陶瓷注射成型中的发展状况,介绍粘结剂的种类,并讨论高分子在陶瓷注射成型中的发展趋势。     

陶瓷注射成型粘结剂现状及发展趋势

本文重点介绍了陶瓷注射成型粘结剂的种类、特性及脱脂技术;比较了目前几种粘结剂体系的优缺点,指出了今后粘结剂发展方向和趋势。     

注射成型氧化铝陶瓷工艺研究

研究了氧化铝陶瓷注射成型工艺过程,包括粘结剂的选择、粉末装载量的确定及热脱脂工艺的研究。探讨了注射压力、注射温度和模具温度等注射成型工艺参数对试样性能的影响,得到了一条优化的氧化铝注射成型工艺路线。     

陶瓷的注射成型技术

陶瓷注射成型技术可解复杂形状的高性能陶瓷元件的大批量生产难题,并且产品尺寸精度高,表面条件好,论述了瓷注射成型工艺中粘结剂选取,注射成型,脱脂等步骤,并提出了将来的研究方向。     

氧化钛金属注射成形工艺

摩根先进陶瓷公司目前正在研发氧化钛的金属注射成形工艺（MIM），以满足高精密医疗设备的生产和其他生物医学技术在应用上的要求。该技术的优点有：便于生产细小，形状复杂的金属部件；是一种净成形技术，不会造成对昂贵材料的浪费；高精度地对金属部件实施打孔、盲孔等工艺。MIM的主要步骤是，先将金属微粉（通常粒径在20μm以下）和粘结剂的混合物注射到模具中；然后通过加热或化学工艺去除粘结剂，剩下金属粉末；最后将得到的金属粉末在炉子里加热，去除残余粘结剂，并使金属粉末烧结戚固态金属（实际密度大于98％）。     

水溶性胶粘剂在粉末冶金和铸造中的应用

阐述了水溶性胶粘剂的优缺点,介绍了水溶性胶粘剂在铸造成形、粉末注射成形工艺中的应用。     

不同粘结剂含量对金属喂料流动性能的影响

通过密炼机混炼出不同比例金属粉末与粘结剂的金属喂料,对不同粘结剂含量的金属喂料进行喂料流动性能对比实验,对比金属粉末含量对喂料熔融指数的影响及不同金属粉末含量在不同温度下表观粘度随剪切速率的变化,得到最佳注塑成型实验所用的最佳喂料配方。结果表明,随着粘结剂含量的增加,金属喂料的流动性能一直提高。在达到金属粉末质量分数92.6%之前,熔融指数急剧上升,当达到92.6%后,熔融指数缓步上升。     

Surface modification of ceramic powders by titanate coupling agent for injection molding using partially water soluble binder system

In the conventional process of ceramic injection molding (CIM), wax-based binders could only be removed by thermal or organic solvent debinding. Recently, water solvent debinding, with its high efficiency and environmental acceptability, has appeared as a good alternative. In this study, zirconia powder modified by titanate coupling agent was applied in partially water soluble binder system for injection molding. In contrast to previous researches about titanate modification mainly focusing on rheological behavior and modification mechanism, investigations on the sintering behavior and densification process were also made in this study. Experimental results reveal that titanate modified powder exhibits densification temperature almost 100 °C lower than that required for the pure, original powder, giving rise to finer microstructure and therefore hopefully improved mechanically properties. It suggests a novel modification route to fabricate injection molded ceramic components using partially water soluble binder system.     

注射成形磁体的粘结剂

论述了粘结剂在注塑磁体中 的作用及粘结剂应有的性能 。分析了三种常用的注塑磁 体粘结剂 。探讨了粘结剂的 开发方向。     

水溶性胶粘剂及其在成形工艺中的应用

阐述了水溶性胶粘剂的优缺点,介绍了水溶性胶粘剂在铸造成形、粉末注射成形工艺中的应用。     

Fabrication of high-aspect-ratio micro piezoelectric array by powder injection molding

A powder injection molding process to fabricate a high-aspect-ratio piezoelectric microarray was developed. The reverse shaped sacrificial mold insert was developed by X-ray micromachining, and then insert-type injection molding was conducted to fabricate the piezoelectric microarray structure. For the micro-powder injection molding, rheological properties of the powder binder mixture were evaluated and analyzed. The measured flow behavior exponent was 0.44 and the flow activation energy was 83 kJ/mol⁻¹. Based on the analyzed rheological property, injection molding conditions were optimized. The rheological property and the injection molding conditions were crucial to ensure complete filling. Using the optimized conditions, two high-aspect-ratio piezoelectric microarrays were fabricated: (i) 20-μm patterns with 1:5 aspect ratio and (ii) 40-μm patterns with 1:10 aspect ratio.     

氧化锆陶瓷注射成形工艺研究

研究了氧化锆陶瓷粉末注射成形工艺过程，包括粘结剂的选择、喂料粉末装载量的确定、混炼工艺及混炼扭矩的研究，注射压力、注射温度、保压压力、模具温度、注射速度等注射成形工艺对成形坯质量的影响，以及溶剂脱脂温度、样品厚度、粉末粒度及形藐等对溶剂脱脂速率的影响及后续热脱脂工艺，扶得了一条优化的注射成形工艺路线。     

Rheological investigations on the flow behavior of polymer‐microsized iron powder composites

With respect to the fabrication of metal parts carrying surface relief microstructures using composite reaction molding as a rapid prototyping variant of micrometal injection molding, the influence of microsized iron powder on the viscosity of different unsaturated polyester resins applied as polymer binder has been investigated systematically. The initial binder viscosity determines the viscosity of the composite and hence the accessible critical filler load. A further dilution of the unsaturated polyester resin with styrene allows a significant increase of the filler load at constant shear rate and temperature from 36 up to 57 vol% iron content. A successful estimation of the critical filler load using different established empirical models initially developed for ceramic‐filled solutions or dispersions is possible. A pronounced flow activation energy increase at high iron loads was also observed. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers