墙地砖坯体成形压力的确定

在墙地砖的生产中,干压成形是陶瓷粉料成形的有效方法。在陶瓷粉料的成分中,有瘠性物料颗粒,还有分布在这些颗粒之间及毛细孔中的水分和气体等。气体可看作是使陶瓷粉料干压成形过程复杂化的主要因素,并且当成形压力较小时,陶瓷粉料中的气体不易排除,所得墙地砖坯体的致密度低而且极易起层等,严重时甚至成不了形,压不成砖;如果成形压力过大,虽然所得墙地砖坯体的致密度高,但坯体中的气体还未完全排除以及固体颗粒压缩后弹性变形较大。也会导致墙地砖坯体变形、产生起层和裂纹等缺陷。因此,只有选用适宜的成形压力,才能获得致密度高而质量好的优质产品。     

墙地砖的塑性挤压成形

1前言墙地砖生产中普遍采用含水率为5－7％的粉料压制成形──于压成形方法。当适宜的成形压力作用于模腔中的粉料时，粉料的各组分互相靠拢。变形，迫使孔隙率减少和坯体结构致密化而成为墙地砖坯体。干压成形制造墙地砖需价格昂贵的喷雾干燥制粉及大吨位全自动液压压砖机等大型设备，设备投资大、结构复杂、故障率高。维修保养困难、污染环境，危害操作工人的身体健康。我们开发的墙地砖塑性挤压成形技术属湿法成形，具有生产工艺简单、操作方便、无粉尘污染、投资小、见效快、产品质量好、产品更换快等优点。为此笔者根据本人在设计制造…     

陶瓷墙地砖干法制粉工艺技术现状及发展

1　墙地砖干法制粉工艺技术国内外发展概况1.1　国外墙地砖压形粉料制备工艺技术概况70年代起 ,喷雾干燥湿法制粉工艺技术应用于陶瓷墙地砖压形粉料的制备 ,其制备的粉料可满足大吨位自动压砖机的要求 ,生产出高质量、高档次的产品。喷雾干燥湿法工艺的优点被大家所公认。然而 ,该工艺存在一次性投资大、能耗高的不足 ,在今天能源价格上涨及墙地砖市场竞争中显得愈加突出。国外自 80年代初开始开发研究陶瓷墙地砖干法制粉工艺技术 ,即原料用干料粉碎后加水造粒 ,至压形粉料含水量 (5 %～ 7% ) ,经闷料后压形。为了提高造粒效果 ,又采用了造…     

墙地砖压制成形用陶瓷粉料的工艺性能

分析了陶瓷墙地砖的压制成形过程及陶瓷粉料的组成,并详细地论述墙地砖压制成形用陶瓷粉料的工艺性能及成形后的坯体质量。     

关于砖坯强度影响因素的答疑

<正>问:韩工,请问是否砖坯粉料越细强度越高?影响坯体强度的因素有哪些?答:你好,你问的问题很笼统,传统的建筑陶瓷坯体成型一般为喷雾粉料半干压成型,喷雾粉料半干压具有三个特点:一是粉料颗粒是假颗粒,含有固相(矿物颗粒)、液相(水分)和气相(空气)。这些含有水分(一般在3%~12%范围)和空气的假颗粒需要具备流动性、压缩性     

墙地砖的塑性挤压成型

1前言目前，墙地砖的生产一般普遍采用是将含水率为5％－7％的陶瓷粉料置于全自动液压机的模腔中，用适宜的压力压制，使陶瓷粉料的各组分互相移近靠拢、变形，迫使孔隙减小，使陶瓷坯体结构致密，成为墙地砖坯体（见图1）。由此可见，利用干压法成型墙地砖，需用经过喷雾干燥制得粉料及全自动液压压砖机。高吨位的液压压砖机价格昂贵，结构复杂，维修保养困难。压制的坯体成本较高。压坯过程中，粉尘飞扬，污染环境，危害操作工人的身体健康。图1陶瓷粉料干压成型示意图1．模框2．上模3.陶瓷粉料4底模近期开发的墙地砖塑性挤压成型生产技术…     

中国陶瓷工业应加强粉料压力成形技术及装备的研究与开发

从古至今,世界陶瓷制品生产工艺基本上走的是物料(原料)由干法变湿法又由湿法变干法(产品)的路子,即干→湿→干.尽管是绕弯路,但目前尚未找到更好的方法.此工艺以制坯原料的形态来划分,有注浆成形、塑性成形和粉料压力成形(干压或半干压)三大基本方法.选用何种工艺方法并无特殊的规定,而是由各企业根据本身的条件和产品结构特点具体制定.即使在同一工艺方法中也可再细分.例如卫生洁具的注浆成形又有管道压力注浆、微压注浆、高压注浆等.在现有的三大方法中由湿变干走的路最短者,当推粉料压力成形法.假定坯体入窑水分定为1%,注浆成形坯体需脱水分26%以上;塑性成形坯体需脱去水分18%以上;而粉料压力成形坯体最多只需脱去水分5%～6%.坯体脱水工艺就是干燥,需要很大的投资.而粉料压力成形坯体干燥成本要低得多.     

陶瓷工业生产中压力成型用颗粒状粉料制备技术发展概况

1　颗粒状粉料制备技术在陶瓷工业生产中的重要地位用陶瓷原料制备成含水量在 2 %～ 8% (绝大多数在 6%左右 )的颗粒状粉料供给压力成形制作成坯体 ,不但在陶瓷工业生产墙地砖制品方面获得国内外最广泛最普遍的采用 ,而且在日用陶瓷、电瓷、特种陶瓷等行业也具有广泛的发展前景。例如等静压法成形盘、碟、浅碗坯体 ,成形电瓷大套管 ,成形高铝研磨球等。在现代化的陶瓷工业生产成形工艺技术中 ,相对于塑性成形、注浆成形、压塑和热压铸等特种成形 ,粉料压力成形在现代愈来愈多的被重视和应用 ,大概是出于下述几个原因 :1)粉料生产的机械化、…     

陶瓷墙地砖粉料压制成形机理及其CAE分析的探索研究

本文在陶瓷墙地砖粉料压制成形机理的基础上,对粉料压制成形过程中变形及运动特点进行了分析,借助粉末冶金技术中的流变学理论,建立起适合陶瓷墙地砖粉料压制成形机理的数学模型,为后期的CAE优化分析工作奠定了基础。     

陶瓷墙地砖的干法制粉生产技术

介绍了陶瓷墙地砖的干法制粉生产技术的发展过程、工艺流程、粉料性能及产品质量，并详细论述了陶瓷墙地砖的干法制粉生产技术，该技术具有生产工艺简单、所需设备少、投资少、见效快、节约能源及水资源、生产成本低廉、产品质量好及不需使用价格昂贵的减水剂(稀释剂)等优点，是陶瓷墙地砖企业最有发展前途的制粉生产技术。     

Porcelain tile microstructure: Implications for polished tile properties

The present study was undertaken to determine the influence of sintered porcelain tile microstructure on mechanical properties (fracture strength, modulus of elasticity and fracture toughness) and surface properties (gloss and stain resistance). To obtain sintered specimens with different microstructures the peak firing temperature was varied for bodies made with industrial spray-dried powder, and sets of test compositions were also made in which quartz content and quartz particle size were varied.Liquid-phase sintering is the typical densification mechanism involved in the achievement of minimum porosity, which is characterised by isolated round pores. Bloating occurred above the firing temperature for minimum porosity. Increases in quartz content and quartz particle size in the starting composition led to reduced body sinterability, and thus gave rise to higher porosity in the fired tile.Mechanical properties were adversely affected by an increase in fired tile porosity. For the same variation in porosity, mechanical properties were more sensitive to the change in quartz content than to changes in particle size. No toughening effect was observed with a rise in quartz content or a decrease in particle size: mechanical properties depended primarily on sintered specimen porosity.Gloss and stain resistance (which characterise polished surface quality) varied with surface porosity, both showing the highest values for lowest porosity. The relationship between porosity and gloss was close to linear.     

Porous single-fired wall tile bodies: Influence of quartz particle size on tile properties

This study examines the effect of quartz particle size in raw material composition customarily used for the manufacture of porous single-fired wall tile bodies on the characteristics of the green tiles and on the thermal and mechanical properties of the fired tiles. Quartz particle size was varied, while the quantity and particle size of the other raw materials were kept constant. Tile compacts were formed by uniaxial pressing and fired at different peak temperatures. The resulting fired microstructure was then characterised and tile thermal and mechanical properties were determined. Microcrack formation around quartz particles leads to hysteresis of the coefficient of thermal expansion during heating and cooling. The studied mechanical and thermal properties are shown to be a function of the magnitude of the hysteresis and porosity. This relationship is independent of the operating variables (pressing pressure, operating temperature, and quartz particle size) used. The results obtained confirm that the green and fired properties of porous single-fired wall tiles may be considerably enhanced, while holding low shrinkage and high porosity, compatible with low moisture expansion, by reducing quartz particle size and appropriately adjusting the pressing pressure and peak firing temperature. This should enable thin and/or large-sized porous wall tiles to be manufactured, without (immediate or delayed) curvatures, and with a higher breaking load than that required by the standards.     

抗菌印花砖的研究

在通过对银系陶瓷抗菌剂物化性能研究的基础上,采用几种制釉工艺将其应用于釉面上,并对其抗菌性能,影响因素,经济指标及抗菌机理做了阐述。     

水泥磨主减速机瓦温升高的分析和解决

Φ4.2 m×13.5 m水泥磨主减速机在正常生产中，4#瓦频繁出现瓦温快速升高超限，导致磨机跳停。对减速机内部结构机械传动系统、测温系统、润滑系统进行全面彻底检查维修，重新开机试运行后设备运转正常。     

墙地砖胶粘剂的研制

通过在聚合过程中加入硅烷偶联剂,制得一种耐水性优良的苯丙乳液,并用该乳液制得耐水、耐修性优良的即用型墙地砖胶粘剂。实验表明,硅烷偶联剂的加入量和加入方式对产品耐水性的影响较大,同时,以丙二醇丁醚和甲基羟丙基纤维素分别为作产品的成膜助剂及培稠剂,产品的综合性能较佳。     

Ceramic mixes for stove tile

The paper sums up the results obtained in the formulation of mixes for the manufacture of stove tile from various clays, chalk, and dolomite. The, discussion covers water absorption, apparent density, porosity, thermal conductivity, and linear thermal expansion of the tile and their relation to the structure and phase composition of the products. Translated from Steklo i Keramika, No. 5, pp. 19–22, May, 1997.