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GB/T 43873-2024: Test method for upper and lower limit annealing temperatures of ultra-thin glass
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| GB/T 43873-2024 | English | 279 |
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Test method for upper and lower limit annealing temperatures of ultra-thin glass
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GB/T 43873-2024
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Basic data | Standard ID | GB/T 43873-2024 (GB/T43873-2024) | | Description (Translated English) | Test method for upper and lower limit annealing temperatures of ultra-thin glass | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q30 | | Classification of International Standard | 81.040.01 | | Word Count Estimation | 14,111 | | Date of Issue | 2024-04-25 | | Date of Implementation | 2024-11-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 43873-2024: Test method for upper and lower limit annealing temperatures of ultra-thin glass---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 81:040:01
CCSQ30
National Standards of People's Republic of China
Test method for upper and lower temperature limits of ultra-thin glass annealing
Released on 2024-04-25
2024-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document refers to ISO 7884-3:1987 "Glass viscosity and viscosity fixed points Part 3: Determination of viscosity using a fiber extension viscometer"
Drafting, the degree of consistency is non-equivalent:
Please note that some of the contents of this document may involve patents, and the issuing agency of the document does not assume the responsibility for identifying patents:
This document was proposed by China Building Materials Federation:
This document is under the jurisdiction of the National Technical Committee for Standardization of Industrial Glass and Special Glass (SAC/TC447):
This document was drafted by: Beijing University of Technology, Rainbow Display Devices Co:, Ltd:, Sichuan Hongke Innovation Technology Co:, Ltd:, Bengbu City
Product Quality Supervision and Inspection Institute, Shenzhen Shenzhongyuan Technology Co:, Ltd:, Dongguan Yintaifeng Optical Technology Co:, Ltd:, Hebei Window Glass Co:, Ltd:
Limited, Xianning CSG Optoelectronic Glass Co:, Ltd:, Jiangxi Voge Optoelectronics Co:, Ltd:, Chongqing Xinjing Special Glass Co:, Ltd:, Lansco
Technology Co:, Ltd:, Tangshan Lanxin Glass Co:, Ltd:, Jining Quality Metrology Inspection and Testing Institute (Jining Semiconductor and Display Products
Quality Supervision and Inspection Center, Jining Fiber Quality Monitoring Center), Dongxu Group Co:, Ltd:, Henan Ancai Hi-Tech Co:, Ltd:, China
China Testing Holding Group Co:, Ltd:, Beijing Zhongtian Standardization Technology Research Institute Group Co:, Ltd:, Guizhou Provincial Building Materials Product Quality
Inspection and Testing Institute, Beijing Xuhui Xinrui Technology Co:, Ltd:
The main drafters of this document are: Tian Yingliang, Li Miao, Li Qing, Xu Lihua, Hu Shuqiang, Xia Zhiqiang, Li Yantao, Wang Lin, Zhong Ying, Wang Mingzhong,
Tang Zhangang, Yi Weihua, Yang Xilong, Lin Jiafu, Gong Ruilong, Zhang Jun, Zhang Xun, Zhang Kai, Huang Hao, He Yimin, Liang Xinhui, Hu Zhengyi, Li Junjie,
Gao Shuhui, Zhao Zhiyong, Tian Xuejie, He Feng, Wu Yufeng, Wang Hui, Guo Li:
Test method for upper and lower temperature limits of ultra-thin glass annealing
1 Scope
This document specifies the principle, test device, sample preparation, test steps, data processing and result table of the upper and lower limit temperatures of ultra-thin glass annealing:
Demonstration and test report:
This document is applicable to the measurement of upper and lower annealing temperature limits of ultra-thin glass, and other forms of glass shall be implemented for reference:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 4167 Weights
GB/T 21389 Vernier, dial and digital calipers
GB/T 28857 DC differential transformer displacement sensor
3 Terms and definitions
The following terms and definitions apply to this document:
3:1
The temperature value at which 95% of the thermal stress of glass materials or products is eliminated in a short period of time:
Note: Generally, the corresponding glass viscosity value is 1013dPa·s, also known as the annealing point temperature, denoted as Ta:
3:2
The temperature value corresponding to the elimination of 5% thermal stress of glass materials or products in a short period of time:
Note: Generally, the corresponding glass viscosity value is 1014:5 dPa·s, also known as the strain point temperature, denoted as Tst:
4 Principle
When a cylindrical glass fiber sample is heated locally or as a whole under vertical load, it will produce viscous elongation within the annealing range:
The relationship between the sample elongation rate and the sample diameter, load mass and viscosity conforms to formula (1):
Substituting the corresponding viscosity value into formula (1) can obtain the corresponding elongation speed: By taking the logarithm of the elongation speed and plotting the temperature curve, the final determination is
Set the upper annealing temperature and the lower annealing temperature:
dL/dt=
8mgL
πd2η
×105 (1)
Where:
η ---Viscosity value, unit is deciPascal second (dPa·s);
m --- load mass, in grams (g);
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