BS 7034-7-1988
玻璃粘度和测定粘度固定点.第7部分:采用射束弯曲法对退火点和应力点的测定方法

Viscosity and viscometric fixed points of glass - Method for the determination of annealing point and strain point by beam bending


 

 

非常抱歉,我们暂时无法提供预览,您可以试试: 免费下载 BS 7034-7-1988 前三页,或者稍后再访问。

如果您需要购买此标准的全文,请联系:

点击下载后,生成下载文件时间比较长,请耐心等待......

 

标准号
BS 7034-7-1988
发布日期
1989年01月31日
实施日期
1989年01月31日
废止日期
中国标准分类号
Q30
国际标准分类号
81.040.10
发布单位
GB-BSI
被代替标准
86/51630 DC
适用范围
This part of ISO 7884 specifies a method of determining the an-nealing point and the strain point of a glass by beam bending. These values have been found useful for specifying the cooling programme in the production of glassware. The annealing point and strain point include a well-defined temperature decrease during the measurement.At temperatures corresponding to the annealing and strain points, the viscosity of glass is highly time dependent. Hence, any viscosities that might be derived or inferred from measurements carried out according to this part of ISO 7884 cannot be assumed to represent equilibrium structural con-ditions. Therefore, the insertion of the strain point into the VFT-equation (see ISO 7884-1) is always impossible. The inser-tion of the annealing point causes in some cases marked failures.NOTE —The annealing and strain points by beam bending can also be determined using devices as specified in ISO 7884-4, but these devices are more expensive and the procedures lead to some viscosity-temperature and viscosity-time relationships besides the fixed points. In this part of ISO 7884, however, the device and procedure are restricted to the fixed-point determination.note:* 1 dPa·s = 1 dN·s/m = 1 P(P is the symbol for poise)

BS 7034-7-1988系列标准





Copyright ©2007-2022 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证:京ICP证110310号