GB/T 25144-2010 English PDF

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GB/T 25144-2010: Determination of coefficient of mean linear thermal expansion for vitreous and porcelain enamels
Status: Obsolete

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 25144-2010	239	Add to Cart	3 days	Determination of coefficient of mean linear thermal expansion for vitreous and porcelain enamels	Obsolete

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Basic data

Standard ID: GB/T 25144-2010 (GB/T25144-2010)
Description (Translated English): Determination of coefficient of mean linear thermal expansion for vitreous and porcelain enamels
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G94
Classification of International Standard: 71.120; 25.220.50
Word Count Estimation: 6,624
Date of Issue: 2010-09-26
Date of Implementation: 2011-03-01
Regulation (derived from): National Standard Approval Announcement 2010 No.6 (Total No.161)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the determination of the average linear thermal expansion coefficient is lower than the transition temperature of vitreous enamel. This standard applies to the determination of vitreous enamel average linear thermal expansion coefficient.

GB/T 25144-2010: Determination of coefficient of mean linear thermal expansion for vitreous and porcelain enamels

---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.
Determination of coefficient of mean linear thermal expansion for vitreous and porcelain enamels ICS 71.120; 25.220.50 G94 National Standards of People's Republic of China Determination enamels average linear thermal expansion coefficient Issued on. 2010-09-26 2011-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released People's Republic of China National standard Determination enamels average linear thermal expansion coefficient

Foreword

The reference standard ISO 7991. 1987 "Determination of glass average linear thermal expansion coefficient", ASTME228.2006 "with the push rod dilatometer Test Method for solid materials linear thermal expansion coefficient "and developed. The standard proposed by China Petroleum and Chemical Industry Association. The standard glass-lined equipment by the National Standardization Technical Committee (SAC/TC72) centralized. This standard was drafted. Changshu Huamao Chemical Equipment Co., Ltd. Jiangyin Silicon Cape enamel, chemical industry and non-metallic materials Equipment Quality Supervision and Inspection Center. The main drafters of this standard. Yuxian Zhong, Zhou Zhiqiang, Zhang Nan, Lin Chun Sang. Determination enamels average linear thermal expansion coefficient

1 Scope

This standard specifies the method for determination of the average linear thermal expansion coefficient is lower than the transition temperature of vitreous enamel. This standard applies to the determination of enamels average linear thermal expansion coefficient.

2 Terms and definitions

The following terms and definitions apply to this standard. 2.1 The average linear thermal expansion coefficient coefficientofmeanlinearthermalexpansion α (t0; t) At a test temperature, length and volume change of the sample temperature change amount and ratio of initial sample length. By the formula (1). α (t0; t) = 1L0 × L-L0 t-t0 (1) Where. t0 --- initial temperature or reference temperature, in degrees Celsius (℃); t --- sample test temperature, in degrees Celsius (℃); --- The L0 sample length at a temperature of t0, millimeters (mm); --- The length L of the sample at the temperature t, in millimeters (mm). This standard specifies the reference temperature t0 of 20 ℃. 2.2 Transition temperature transformationpoint Enamels state brittle transition temperature viscous state. Factors affecting the measurement accuracy 3.1 dilatometer test precision structural materials will have a substantial impact. Regardless of the material, determining material expands, stable performance is necessary of. Thus, in the course of repeated use, the structural material does not measurable change occurs. 3.2 heating, the sample will be inelastic creep common preventive measures is to increase its cross-section as possible. 3.3 dilatometer avoid internal moisture, especially at low temperatures. 3.4 During the test, the sample loading tube with a bracket or the sample is fixed in place. 3.5 sample loading tube should be used the same material and putters. After the replacement of damaged, without strict alignment should not be used. Otherwise, it will greatly increase the measurement error. 3.6 deal with the dilatometer routine calibration. The specific measures of the expansion measured standard sample.

4 device

4.1 calipers Caliper accuracy of 0.01mm. 4.2 pusher dilatometer Pusher expansion instrument should be able to measure the change in sample length of 2 × 10-3L0. Contacting the sample with the end face of the plunger should be spherical, aspherical Install the form of a radius of curvature shall not be less than the diameter of the sample, the sample with the plunger shown in Figure 1. ......

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