CN101858875A - Test method of expansion coefficient of glass thread - Google Patents
Test method of expansion coefficient of glass thread Download PDFInfo
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- CN101858875A CN101858875A CN201010199810A CN201010199810A CN101858875A CN 101858875 A CN101858875 A CN 101858875A CN 201010199810 A CN201010199810 A CN 201010199810A CN 201010199810 A CN201010199810 A CN 201010199810A CN 101858875 A CN101858875 A CN 101858875A
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Abstract
The invention relates to a test method of an expansion coefficient of a glass thread. The test method comprises the following steps: using the existing expansion coefficient tester, processing a test sample into a flat strip shape, cutting the two ends into triangles, grinding the top angles of the two end top parts into small flat surfaces, putting the test sample between a quartz movable rod and a quartz supporting frame; respectively leading the two small flat surfaces to be contacted with the quartz movable rod and the quartz supporting frame, and carrying out detection after the tester is stable. The test method is simple and convenient, is very easy to grind the tip ends into small flat surfaces, greatly reduces the contact area when the sample is tested, and can well control the levelness of the end surfaces when the sample is ground, and the test result is not influenced by the levelness of the end surfaces and has high accuracy.
Description
Technical field
The present invention relates to a kind of method of testing of linear expansion coefficient, especially the vacuum solar collector tubes method of testing of the linear expansion coefficient of glass tube.
Background technology
The expansion coefficient of glass is one of important physical parameter of glass, and the size of expansion coefficient directly affects the thermal stability of glassware, and then the scope of application of decision glass.The basic reason that object bursts is the violent expansion of volume or shrinks generation huge tension or compressive stress that expansion coefficient is the physical parameter of this performance of exosyndrome material just.Glass stands violent temperature variation and non-destructive performance is called thermal stability, and also thermal expansivity just of the factor that calculates glass heat stability influence maximum.
The main heat absorbing element of solar water heater---the complete glass vacuum sun thermal-collecting tube long term exposure is outdoor, along with season, round the clock, the variation of weather, the temperature variation of its working environment is extremely complicated, this just requires it that good thermal stability will be arranged, just require the expansion coefficient of this glass should be low as much as possible, complete glass vacuum sun thermal-collecting tube generally adopts borosilicate 3.3 glass now, and expansion coefficient is (3.3 ± 0.1) * 10
-6K
-1Because manufacturer's glass production process control is not strict, cause the properties of product instability, thus seek a kind of convenient, fast, measure the method for glass tube expansion coefficient exactly, be very important to the quality of control complete glass vacuum sun thermal-collecting tube.The expansion coefficient that present domestic glass industry is measured glass mainly contains two kinds of methods, be mariages relative method and instrumental method, the former can not directly measure the expansion coefficient of glass and be fiducial value, it or not international standard, and the error that human factor is brought is too big, generally use the latter to test expansion coefficient in the world, the maximum weak point of its method is too strict to the requirement of specimen, need make diameter 6mm, long 50 ± 2mm glass bar, strict parallel of two end faces of glass bar, and also side fine grinding vertically becomes a plane, this is very difficult for the glass tube applying unit, or even impossible.
Summary of the invention
The technical problem to be solved in the present invention is for the glass tube manufacturing, uses producer to find a kind of method of easy and stable strong mensuration expansion coefficient.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is:
A kind of method of testing of expansion coefficient of glass thread, with existing expansion coefficient analyzer, specimen is processed as flat-shaped, two ends cut into triangle, drift angle with the top, two ends grinds facet again, specimen is placed between quartzy moving bar and the quartzy carriage, and two facets contact with quartzy carriage with the moving bar of quartz respectively, detect after instrument to be determined is stable.
This method of testing is not special harshness to the dimensional requirement of sample, thereby embodied the simplicity of the method, but for guaranteeing the stability of test data, sample length is preferably between (100 ± 5) mm, the also no requirement (NR) of leg-of-mutton angle that two ends cut into, the preferred 1-4mm of thickness of sample no requirement (NR); Usually the formed faceted width in two most advanced and sophisticated polishing backs is 1 ± 0.5mm on the basis of the original thickness of sample, and length and specimen consistency of thickness get final product.Sample must vertically be positioned on the quartzy carriage during test, and the center line of sample must overlap with the center line of quartzy moving bar, observes, controls its placement situation from different directions and get final product.
Method of testing of the present invention is easy, the accuracy height.When testing tubular products is made sheet sample, can not change the performance of product, sample can directly cut on glass tube with glass cutter and produce, two ends cut into triangle, grind two facets on most advanced and sophisticated (top), the tip is polished into facet is very easy to, contact area significantly reduces during sample test, the concordant degree of end face just can well be controlled during the sample polishing, and test result just can not be subjected to the influence of the concordant degree of end face.In Dec, 2006, we were 3.28 * 10 at the glass tube linear expansion coefficient of national light industry glass product quality supervision inspection center test
-6K
-1, we leave sample as standard sample pipe (with wire drawing relative method tested glass pipeline expansion coefficient time need use standard specimen) this glass tube, and we also are 3.28 * 10 with the inventive method test standard specimen expansion coefficient
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-1, illustrate that accuracy of test is very high.
Description of drawings
Sample installation diagram when Fig. 1 tests for the present invention;
Wherein 1 is quartzy moving bar, and 2 is sample, and 3 is quartzy carriage.
Embodiment
To utilize the expansion coefficient analyzer to measure the expansion coefficient of solar water heater with complete glass vacuum sun thermal-collecting tube 3.3 glass tubes in order exploring, the production and processing technology of glass tube to be instructed to some extent simultaneously, we have carried out a series of test experiments.Select wherein part experiment to set forth below:
Embodiment 1
At first the expansion coefficient analyzer is calibrated, we have selected a kind of glass bar of the B40 of being called glass for use, and (by the standard-required diameter is Φ 5, and measuring its expansion coefficient through China Building Materials Academy is 4.0 * 10
-6K
-1) the ZNO-I type expansion coefficient analyzer made of Beijing WWW peace Science and Technology Ltd. of purchasing with Himin?Solar Co., Ltd. detection technique center measures its expansion coefficient, the result is as shown in table 1:
The test record of table 1 glass bar
| Temperature ℃ | ??20 | ??50 | ??100 | ??150 | ??200 | ??250 | ??300 |
| Displacement mm | ??0.1702 | ??0.1818 | ??0.1996 | ??0.2169 | ??0.2331 | ??0.2495 | ??0.2662 |
Measuring glass bar length is 99.98mm, and the substitution following formula calculates the linear expansion coefficient of glass bar
Again sample has been carried out repeatedly reperformance test afterwards, the expansion coefficient result is 3.95 * 10
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-1To 4.10 * 10
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-1Between, the test result deviation is in (0.05～+ 0.1) * 10
-6K
-1Within, illustrating that the test result of the expansion coefficient analyzer that the embodiment of the invention is used is true and reliable, our test experiments result is effective.
With embodiment 1 described expansion coefficient analyzer, solar water heater is processed as flat-shaped with Φ 47 glass tube specimen, two ends are triangle, the drift angle on top, two ends is ground facet, sample length 99.90mm, thickness 1.6mm, two facet width 1mm, sample is placed between quartzy moving bar and the quartzy carriage, two facets contact with quartzy carriage with the moving bar of quartz respectively, specimen vertically is positioned on the quartzy carriage, the center line of sample must overlap with the center line of quartzy moving bar, observe its placement situation of control from different directions and get final product, instrument preheating 30min detects after video data is stable, measure the mean coefficient of linear thermal expansion of this sample, test result is as shown in table 2:
Table 2 Φ 47 hollow billet thickness 1.6mm foliated glass expansion test recording tables
| Temperature ℃ | ??14 | ??50 | ??100 | ??150 | ??200 | ??250 | ??300 |
| Displacement mm | ??0.1689 | ??0.1803 | ??0.1960 | ??0.2102 | ??0.2225 | ??0.2354 | ??0.2478 |
Measuring 1.6mm foliated glass length is the linear expansion coefficient that 99.90mm substitution following formula calculates glass sheet
Embodiment 3
Repeated experiment: because vacuum tube for solar water heater glass hollow billet diameter difference, after this we are processed into flat-shaped with the vacuum tube for solar water heater glass hollow billet of other specifications of same material again, two ends are triangle, the drift angle on two ends tops is ground faceted sample carried out repeatedly test, the result is shown in table 3,4,5:
1) measuring 1.8mm foliated glass length is 101.78mm and according to table 3 data, and the substitution following formula gets the linear expansion coefficient of glass sheet
The thick 1.8mm foliated glass of table 3 Φ 58 hollow billets expansion test recording table
| Temperature ℃ | ??11 | ??50 | ??100 | ??150 | ??200 | ??250 | ??300 |
| Displacement mm | ??0.1751 | ??0.1888 | ??0.2044 | ??0.2187 | ??0.2308 | ??0.2430 | ??0.2552 |
2) measuring 1.6mm foliated glass length is 100.08mm and according to table 4 data, and the substitution following formula gets the linear expansion coefficient of glass sheet
The thick 1.6mm foliated glass of table 4 Φ 47 hollow billets expansion test recording table
| Temperature ℃ | ??14 | ??50 | ??100 | ??150 | ??200 | ??250 | ??300 |
| Displacement mm | ??0.1631 | ??0.1761 | ??0.1918 | ??0.2056 | ??0.2177 | ??0.2303 | ??0.2420 |
3) measuring 1.6mm foliated glass length is 103.50mm and according to table 5 data, and the substitution following formula gets the linear expansion coefficient of glass sheet
The thick 1.6mm foliated glass of table 5 Φ 37 hollow billets expansion test recording table
| Temperature ℃ | ??18 | ??50 | ??100 | ??150 | ??200 | ??250 | ??300 |
| Displacement mm | ??0.1732 | ??0.1851 | ??0.2014 | ??0.2138 | ??0.2278 | ??0.2404 | ??0.2536 |
Above result of calculation is respectively: 3.27 * 10
-6K
-1, 3.31 * 10
-6K
-1, 3.30 * 10
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-1
The glass tube that we tested is borosilicate 3.3 glass, and its linear expansion coefficient requires in (3.3 ± 0.1) * 10
-6K
-1In the scope, it is 3.27 * 10 that the glass tube sample that we randomly drawed in November, 2007 is tested its linear expansion coefficient in national light industry glass product quality supervision inspection center
-6K
-1, identical substantially with above our usefulness the method test result.The test result that this proof is carried out the glass tube linear expansion coefficient with this clearly demarcated method is to stablize, reliably, and it is feasible carrying out the test that the glass fiber pipeline expands with this kind method.
Claims (4)
1. the method for testing of an expansion coefficient of glass thread, it is characterized in that, specimen is processed as flat-shaped, two ends cut into triangle, drift angle with the top, two ends grinds facet again, specimen is placed between quartzy moving bar and the quartzy carriage, and two facets contact with quartzy carriage with the moving bar of quartz respectively, treat that the expansion coefficient analyzer detects after stable.
2. according to the method for testing of the described expansion coefficient of glass thread of claim 1, it is characterized in that specimen vertically is positioned on the quartzy carriage, and the center line of specimen and the quartzy central lines of moving bar.
3. according to the method for testing of the described expansion coefficient of glass thread of claim 1, it is characterized in that specimen length is at 95-105mm.
4. according to the method for testing of the described expansion coefficient of glass thread of claim 1, it is characterized in that described facet width is 0.5-1.5mm.
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| CN201010199810A CN101858875A (en) | 2010-06-13 | 2010-06-13 | Test method of expansion coefficient of glass thread |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293178A (en) * | 2012-07-05 | 2013-09-11 | 成都光明光电有限责任公司 | Testing method and device of glass swelling coefficient |
| CN105510378A (en) * | 2015-12-29 | 2016-04-20 | 东旭科技集团有限公司 | Determination method of dilatation coefficient of glass |
| CN105527313A (en) * | 2015-12-30 | 2016-04-27 | 东旭科技集团有限公司 | A glass shrinkage measuring method |
| CN108519402A (en) * | 2018-03-28 | 2018-09-11 | 北京工业大学 | The device and method that laser method measures ultra-thin glass reheating linear shrinkage ratio |
| CN112213353A (en) * | 2020-09-09 | 2021-01-12 | 中国科学院金属研究所 | Method for testing linear expansion coefficient |
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| CN1828261A (en) * | 2006-03-31 | 2006-09-06 | 中国科学院上海光学精密机械研究所 | Polymer thermomechanical property testing device |
| US7722246B1 (en) * | 2005-04-20 | 2010-05-25 | Carty William M | Method for determining the thermal expansion coefficient of ceramic bodies and glazes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7722246B1 (en) * | 2005-04-20 | 2010-05-25 | Carty William M | Method for determining the thermal expansion coefficient of ceramic bodies and glazes |
| CN1828261A (en) * | 2006-03-31 | 2006-09-06 | 中国科学院上海光学精密机械研究所 | Polymer thermomechanical property testing device |
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| 《武汉工业大学学报》 19930930 潘素瑛等 热膨胀仪的研制 8-12 1-4 第15卷, 第3期 2 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293178A (en) * | 2012-07-05 | 2013-09-11 | 成都光明光电有限责任公司 | Testing method and device of glass swelling coefficient |
| CN103293178B (en) * | 2012-07-05 | 2016-03-23 | 成都光明光电有限责任公司 | The method of testing of glass expansion coefficient |
| CN105510378A (en) * | 2015-12-29 | 2016-04-20 | 东旭科技集团有限公司 | Determination method of dilatation coefficient of glass |
| CN105510378B (en) * | 2015-12-29 | 2018-08-17 | 东旭科技集团有限公司 | A kind of assay method of glass expansion coefficient |
| CN105527313A (en) * | 2015-12-30 | 2016-04-27 | 东旭科技集团有限公司 | A glass shrinkage measuring method |
| CN105527313B (en) * | 2015-12-30 | 2019-01-11 | 东旭科技集团有限公司 | The measuring method of also retract rate |
| CN108519402A (en) * | 2018-03-28 | 2018-09-11 | 北京工业大学 | The device and method that laser method measures ultra-thin glass reheating linear shrinkage ratio |
| CN112213353A (en) * | 2020-09-09 | 2021-01-12 | 中国科学院金属研究所 | Method for testing linear expansion coefficient |
| CN112213353B (en) * | 2020-09-09 | 2021-10-22 | 中国科学院金属研究所 | Method for testing linear expansion coefficient |
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Open date: 20101013 |