卫生陶瓷压力注浆成型的泥浆性能研究

研究了卫生陶瓷压力注浆成型的泥浆性能，通过一系列试验，讨论了泥浆性能对压力注浆成型的影响。     

泥浆——模型系统及影响泥浆注浆成形的因素

在研究石膏模型—坯体—泥浆系统的基础上,探讨陶瓷浇注成形机理,结合部分试验结果,综合论述了泥浆、模型性能及温度、压力等外部条件的变化对浇注成形的影响,提出了加快成形速度、改善浇注性能、提高产品质量在工艺上应控制的因素以及它们之间的相互关系。     

泥浆注浆过程机理的探讨

回顾了用“过滤理论”描述泥浆注浆过程机理的有效性。从该理论出发,设计了一个能精确测量注浆过程参数的装置。测定和验证了长期以来未能满意地测定注浆过程的原动力—石膏模吸力的数值。得出随用不同石膏与水比例所制备的各种石膏模,其吸力波动在0.26—0.64大气压。测定出用不同石膏模注浆时形成泥层的渗透率介于17～25×10~(-14)厘米~2。从而成功地阐明了注浆速率随石膏模的渗透率增大而减少这个现象的实质。纠正了有关文献和教科书中历来对这个现象的错误解释。为正确控制注浆过程和石膏模的制备提供了理论和实验依据。     

卫生陶瓷注浆泥浆性能及调控

卫生陶瓷注浆泥浆性能及调控在卫生陶瓷企业生产中具有十分重要的意义。本文就注浆泥浆的性能及其调控作一技术研析。1卫生陶瓷成型工艺到目前为止，卫生陶瓷半成品生产应用最广泛的仍然是注浆成型。实际生产中，注浆成型的种类、方式很多，注浆的设备、模型、工具、工艺参数以及操作等也有很大的不同。正是由于这些差别，就要求有不同性能的泥浆与之相适应。泥浆性能差异具体体现在指标值上，注浆泥浆的多项性能指标组成一个性能指标体系。由于卫生陶瓷产品规格较大，外形、结构比较复杂，决定了其半成品的成型生产不能像墙地砖及日用陶瓷…     

高效压力注浆

注浆成形是陶瓷成形中一个最基本的成形工艺,主要适用于形状复杂或不规则制品。虽然它具有适应性大、易投产的特点,但是在现代高效生产的今天,它的弱点越来越显露出来。人们曾发现并使用一些缩短注浆成形时间的方法,但是收效甚微,有些人曾设想用干压成形取代注浆成形,但至今为止只是停留在干压一些器型较简单的小件产品上。目前对于成形大件异型产品而     

注浆泥浆的性质与基本参数的关系

一、序言泥浆的重要性质之一为粘性和吃浆速度。由于它们在注浆成形中的地位极为重要,在工厂中对于它们的变化都给予充分的注意。泥浆的粘性过大时,泥浆流入模型内的速度变小,会出现泥缕等缺陷,严重时甚至可能流不到模型的细小部位。同时排浆时,多余的泥浆不能流净,因而在干燥时容易产生坯裂。反之粘性太小时,由于泥浆中的粗颗粒沉淀,使坯体组织变得不匀还会从模型的对口缝处溢出泥浆,或者出现其它缺陷。     

鱼盘的压力注浆成形

叙述了鱼盘压力注浆成形的过程和结果，列出了对石膏模型的要求。     

鱼盘的压力注浆成形

叙述了鱼盘压力注浆成形的过程和结果，列出了对石膏模型的要求。     

卫生器压力注浆系统实现真空回浆

在“鞍纲宪法”指引下,吸取了兄弟厂的经验,我厂于1973年初建成了卫生器成型工艺的压力注浆设施,结束了自建厂以来在注浆工序上抱大桶的落后面貌。在     

In situ vibration enhanced pressure slip casting of submicrometer alumina powders

This paper presents a novel method for improvement of particle packing in consolidation of submicrometer alumina powders by pressure slip casting. In this method, filtration cell is subjected to a mechanical vibration field with constant frequency of 50 Hz and vibration amplitudes ranging from 0 (no vibration) to 2 mm. Filtration rate, thickness and green density of the fabricated samples were measured to investigate the influence of vibration on filtration characteristics. It was revealed that employment of vibration can significantly increase filtration rate. Furthermore, there is an optimum vibration amplitude which results in the structure with the highest packing density. This value is shifted to higher vibration amplitudes as more concentrated alumina slurries is used. As the available formulation based on Darcy's law could not predict the results of the present investigation, a “Correction Factor” was utilized in order to increase the accuracy of the prediction in the presence of a vibration field.     

Preparing EBCO superconducting targets with uniform phase structure by pressure slip casting

The grain size and phase structure uniformity of europium barium copper oxide (EBCO) superconducting targets would affect the superconducting properties of sputtered film. A uniformly dispersed EBCO slurry was used to prepare high-density green EBCO compacts using slip casting. The effects of milling time and slurry pH on EBCO slurries were studied. Based on the shrinkage data of the EBCO superconducting targets, the densification process was estimated and the apparent activation energy was calculated. The effects of the sintering process on the microstructure and phase composition of EBCO superconducting targets were investigated using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). When the sintering temperature was 950–1050 °C, the EBCO superconducting target comprised EuBa₂Cu₃O₇ and CuO, where a new phase Eu₂BaCuO₅ formed at a sintering temperature of 1100 °C. The Tc and ΔT of the EBCO superconducting target sintered at 950 °C for 30 h were 91.18 K and 2.35 K.     

Enhanced casting rate by dynamic heating during slip casting

The slip casting process is widely used to consolidate ceramic particles from aqueous suspensions to form green compacts, particularly those with complicated shapes. Raising the slip temperature during slip casting is known to increase the casting rate, this is believed to be via a decrease in water viscosity. However, differences have been observed when using convection and microwave heating to raise the temperature. In the present work, it has been found that the use of short-pulses of microwave energy to heat the casting system dynamically causes a greater degree of acceleration than when using conventional radiant heating. The increased uptake of water from the slip by the porous mould is believed to be indicative of a vaporisation–condensation cycle mechanism. A negative pressure would be created during the condensation stage of the cycle, acting as an additional suction force to the capillary action and hence accelerating the casting process.     

Calculating the nonstationary pressure field in castings during slip casting of ceramic articles

Translated from Steklo i Keramika, No. 1, pp. 25–26, January, 1990.     

Quartz products made by slip casting

Conclusions From finely milled fused quartz it is possible to obtain, by the slip method, adequately strong quartz products with high thermal-shock resistance at low firing temperatures. A substantial increase in the strength of the quartz products can be obtained by impregnating them with silicone resins followed by firing at 1100°C.Translated from Ogneupory, No.1, pp.47–49, January, 1967.     

Heat-resistant saggers produced by slip casting

Heat-resistant saggers containing granular silicon carbide filler with particles up to 130 μm in size were obtained by slip casting in gypsum molds. The silicon carbide content varied from 30 to 55 wt.%. Prototype batches of saggers of different shapes were tested in gas-heated and mazut-heated kilns and exhibited good service properties, which made it possible to decrease the amount of reject articles in firing. Translated from Steklo i Keramika, No. 4, pp. 24 – 26, April, 1999.