CN1109240C - Method for measuring anchoring strength of coating and sample for measurement - Google Patents
Method for measuring anchoring strength of coating and sample for measurement Download PDFInfo
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- CN1109240C CN1109240C CN 00107205 CN00107205A CN1109240C CN 1109240 C CN1109240 C CN 1109240C CN 00107205 CN00107205 CN 00107205 CN 00107205 A CN00107205 A CN 00107205A CN 1109240 C CN1109240 C CN 1109240C
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- bracing ring
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Abstract
The present invention belongs to the technical field of testing the binding strength of coating layers. A test sample of the present invention is composed of a bracing ring 2 with an upper taper hole 6 and a lower taper hole 7, and a plug 1 inserted into the lower taper hole of the bracing ring 2. The method of the present invention for measuring the binding strength of hot spraying coating layers comprises the steps that: (1) a cone of the plug 1 is inserted into the lower taper hole of the bracing ring 2 for spraying the coating layers to be tested on the upper surface of the bracing ring 2; reinforcing plates are stuck on the surfaces of the coating layers; (3) the test sample is fixed on a tension measure device, force is upward applied from the lower surface of the bracing ring 2, and the plug is clamped to downwards apply force so as to measure the binding strength of the coating layers. Measure results of the measure method of the present invention is not limited by the tensile strength of an adhesive agent so that the present invention can be used for measuring the binding strength of the hot spraying coating layers with high binding strength.
Description
The invention belongs to the anchoring strength of coating technical field of measurement and test, particularly the measurement of hot spray coating such as detonation flame spraying, HVAF bond strength.
The measurement of the Bond Strength of Coating that hot-spraying technique is obtained at present, the national standard of the U.S., Japan and China all adopts method gluing and that stretch.It has the simple and flexible operation characteristics, and does not need complicated Theoretical Calculation.But the range of application of this method is subjected to the restriction of the tensile strength of used bonding agent (glue).Require the Bond Strength of Coating should be generally speaking less than the tensile strength of glue.The tensile strength of the CONAP1222 bonding agent that the CONP company of recommending as ASTMC-633 produces is 55Mpa.The E-7 glue as bonding agent of present domestic employing, its tensile strength is about 70Mpa.In recent years along with the appearance of detonation flame spraying technology, the phenomenon of coming unstuck often appears in the measuring process, illustrate that coating and high base strength substantially exceed the tensile strength of the glue of present use, use ASTMC-633 and GB5210-85 standard can not obtain the numerical value of bond strength, even the bond strength to detonation flame spraying does not provide definite numerical value yet in aviation measuring technology standard.In order to obtain coating and high base strength, " process for treating surface " (Hu Chuanxin work, publishing house of Beijing University of Technology, 1997) provided a kind of measuring method that does not adopt glue, as shown in Figure 3, at the matrix center drilling, make pin and center pit sliding fit, and spray after making matrix face and pin end face be in same plane, press imposed load shown in the figure then, can obtain bond strength.But this method inevitably friction force can occur between pin and the center pit in measuring process, influence the accuracy of measurement result." powder metallurgy " (Ю. А. Х А Р Л А М О В М. И. Л И В Ш И Ц 1983.5, the measuring method of 74-78) mentioning, change pin into taper by right cylinder, basically solved the problem that influences of friction force in the measuring process, but this method extension area in measuring process is very little, often causes the fluctuation of measurement result very big.If the increase extension area, pulling force surpasses the shear resistance of coating itself, causes coating failure, can not obtain bond strength.More than two kinds of methods all be not used as the measurement standard of hot coating.Domestic normal employing E7 glue testing thermal spraying Bond Strength of Coating is because therefore the tensile strength of E7 glue be no more than 80Mpa, when anchoring strength of coating can't be measured during greater than 80Mpa.Along with the application of detonation flame spraying technology and HVAF, Bond Strength of Coating has surpassed the tensile strength of E-7 glue, does not also have other suitable bonding agents to substitute E-7 glue at present, and therefore traditional method of testing can not satisfy demand of practical production.
The order of invention of the present invention is: provide a kind of bond strength measuring method and a kind of sample that is exclusively used in this measuring method that solves the high bond strength hot spray coating, to solve the difficult problem that the high-strength coating bond strength is measured.
Technical scheme of the present invention is: a kind of sample that is used for the measurement of hot spray coating bond strength, it is characterized in that, sample is made up of a bracing ring 2 and an obstruction 1, bracing ring 2 is right cylinders, its center is by a through hole of being made up of last taper hole 6 and lower cone hole 7, the big end of last taper hole 6 diameters is positioned at the upper surface of bracing ring 2, the end that lower cone hole 7 diameters are big is positioned at the lower surface of bracing ring 2, the tapering of last taper hole 6 is 40 °～120 °, the tapering of lower cone hole 7 is 5 °～40 °, last taper hole 6 is 2～20mm with the diameter of the encounter plane of lower cone hole 7, and this encounter plane is 0.2～0.8mm to the distance of bracing ring 2 upper surfaces; Stop up 1 top and be tapering identical, the upper surface diameter and last taper hole 6 and the identical cone of lower cone hole 7 encounter plane diameters of tapering and lower cone hole 7, stopping up 1 bottom is right cylinder, in the lower cone hole 7 of the top cone insertion bracing ring 2 of obstruction 1.
A kind of method of using aforesaid sample measurement hot spray coating bond strength is characterized in that,
(1) will stop up 1 cone and insert in the lower cone hole 7 of bracing ring 2, the upper surface of bracing ring 2 is carried out the spraying of tested coating, after the spraying, coating will go up taper hole 6 and fill and lead up, and the upper surface of bracing ring 2 forms one and is coated with layer plane;
(2) at the coating surface gluing, the stiffening plate that is 1～5mm with a thickness sticks on the coating;
(3) sample is fixed on the stretching measurement mechanism, upwards applies power from the lower surface of bracing ring 2, clamping is stopped up the lower cylindrical body and is applied power downwards, pulls out from lower cone hole 7 until stopping up 1, records Bond Strength of Coating.
The advantage of measuring method of the present invention is: because the tensile strength of drawing process and bonding agent has nothing to do, so measurement result is not subjected to the restriction of the tensile strength of bonding agent, can be used to have the measurement of the hot spray coating intensity of high bond strength.
To stop up 1 and be designed to taper, eliminated stop up in the drawing process 1 and bracing ring 2 between friction force, improved the accuracy of measurement result.
Behind the spray-on coating, because coating has certain porosity, bonding agent 4 can partly be infiltrated up in the coating, be not seeped under the condition of matrix in assurance, improved the fracture strength of coating thickness direction, stiffening plate 5 makes coating become as a whole simultaneously, has further improved the coating bending strength.Simultaneously, the last taper hole 6 on the bracing ring 2 is coated with has expired coating, has increased coating thickness, and the upper surface from bracing ring 2 upper surfaces to obstruction 1 is a tapering transition, has so just significantly reduced the possibility of coating along the thickness direction cracking.For above-mentioned reasons, the inventive method can increase the area of coating test end face, promptly stops up the area of 1 upper surface, improves measuring accuracy, reduces the fluctuation of test result.
Description of drawings.
Fig. 1 is sample structure figure of the present invention.
Fig. 2 is the structural drawing of bracing ring 2.
Fig. 3 is a pin extension test synoptic diagram.
Below in conjunction with accompanying drawing the present invention is elaborated.Referring to Fig. 1, shown in the figure for having sprayed coating and bonding sample behind the stiffening plate.The used sample of measuring method of the present invention is made up of obstruction 1 and bracing ring 2.Bracing ring 2 is right cylinders, its center is by a through hole of being made up of last taper hole 6 and lower cone hole 7 intersections, the big end of last taper hole 6 diameters is positioned at the upper surface of bracing ring 2, the end that lower cone hole 7 diameters are big is positioned at the lower surface of bracing ring 2, the tapering of last taper hole 6 is 40 °～120 °, the tapering of lower cone hole 7 is 5 °～40 °, and last taper hole 6 is 2～20mm with the diameter of the encounter plane of lower cone hole 7, and this encounter plane is 0.2～0.8mm to the distance of bracing ring 2 upper surfaces.The outside diameter of bracing ring 2 adjusts accordingly according to extension test coating end face, the diameter of promptly going up taper hole 6 and the encounter plane of lower cone hole 7, generally is its 3～8 times.The tapering that stops up 1 top and be tapering and lower cone hole 7 is identical, upper surface diameter and last taper hole 6 and the identical cone of lower cone hole 7 encounter plane diameters, the bottom of obstruction 1 is a right cylinder, the top cone of obstruction 1 is inserted in the lower cone hole 7 of bracing ring 2, lower cone hole 7 is filled, last taper hole 6 becomes the pelvic cavity of a lower end closed, and tested coating will be sprayed on the upper surface of this pelvic cavity and bracing ring 2.Among Fig. 1, the 3rd, tested coating, the 4th, bonding agent, the 5th, stiffening plate.Fig. 2 is the structural drawing of bracing ring 2, has more clearly illustrated last taper hole 6 and lower cone hole 7.
Measuring process of the present invention is:
(1) will stop up 1 cone and insert in the lower cone hole 7 of bracing ring 2, and utilize spraying equipment that the upper surface of bracing ring 2 is carried out the spraying of tested coating, after the spraying, coating will go up taper hole 6 and fill and lead up, and the upper surface of whole bracing ring 2 forms one and is coated with layer plane.
(2) at the coating surface gluing, for example be coated with E7 glue, the stiffening plate 5 that is 1～5mm with a thickness sticks on the coating, and the shape of stiffening plate can be identical with the end surface shape of bracing ring 2, can use the sheet metal stiffening plate.
(3) sample is fixed on the stretching measurement mechanism, upwards applies power from the lower surface of bracing ring 2, clamping is stopped up the lower cylindrical body and is applied power downwards, pulls out from lower cone hole 7 until stopping up 1, and measurement mechanism can record Bond Strength of Coating.
Embodiment 1.The diameter d of stopping up the spray area of 1 upper surface is 5mm, the tapering α of lower cone hole 7 is 5 degree, bracing ring 2 outside diameter Φ are 30mm, and the tapering β of last taper hole 6 is 60 degree, and stopping up 1 upper surface is 0.2mm to the vertical range h of bracing ring 2 upper surfaces, detonation flame spraying WC-13Co coating, coating thickness 0.4mm, bonding agent select E-7 glue for use, and the steel stiffening plate 5 that 3mm is thick bonds on the coating, the pulling strengrth of the coating that records is 106.8Mpa, far above the bond strength of E-7 glue.Following table provides the measurement result of other embodiment.
| Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | |
| d | 2mm | 4mm | 15mm | 10mm | 8mm | 12mm | 5mm |
| α | 5 degree | 15 degree | 20 degree | 5 degree | 15 degree | 5 degree | 15 degree |
| Φ | 10mm | 30mm | 60mm | 50mm | 40mm | 60mm | 30mm |
| β | 50 degree | 60 degree | 80 degree | 100 degree | 90 degree | 70 degree | 120 degree |
| h | 0.2mm | 0.4mm | 0.3mm | 0.6mm | 0.7mm | 0.8mm | 0.25mm |
| The coating kind | WC-12Co | WC-12Co | WC-17Co | WC-17Co | WC-13Co | WC-13Co | Cr 2C 3-Ni +Cr |
| Coating thickness | 0.23 | 0.36 | 0.39 | 0.28 | 0.47 | 0.25 | 0.33 |
| Bonding agent | E-7 glue | E-7 glue | E-7 glue | E-7 glue | E-7 glue | E-7 glue | E-7 glue |
| Strengthen thickness of slab | 2mm | 2.5mm | 1.5mm | 3mm | 1.8mm | 2.5mm | 2mm |
| Bond strength | 103MPa | 82MPa | 78MPa | 97MPa | 85MPa | 88MPa | 50MPa |
Claims (2)
1, a kind of sample that is used for the measurement of hot spray coating bond strength, it is characterized in that, sample is made up of a bracing ring [2] and an obstruction [1], bracing ring [2] is a right cylinder, there is a through hole of being made up of last taper hole [6] and lower cone hole [7] at its center, the end that last taper hole [6] diameter is big is positioned at the upper surface of bracing ring [2], the end that lower cone hole [7] diameter is big is positioned at the lower surface of bracing ring [2], the tapering of last taper hole [6] is 40 °～120 °, the tapering of lower cone hole [7] is 5 °～40 °, last taper hole [6] is 2～20mm with the diameter of the encounter plane of lower cone hole [7], and this encounter plane is 0.2～0.8mm to the distance of bracing ring [2] upper surface; That the top of stopping up [1] is tapering is identical with the tapering of lower cone hole [7], upper surface diameter and last taper hole [6] and the identical cone of lower cone hole [7] encounter plane diameter, the bottom of stopping up [1] is a right cylinder, stops up the top cone of [1] and inserts in the lower cone hole [7] of bracing ring [2].
2, a kind of method of using sample measurement hot spray coating bond strength as claimed in claim 1 is characterized in that,
(1) cone that will stop up [1] is inserted in the lower cone hole [7] of bracing ring [2], and the upper surface of bracing ring [2] is carried out the spraying of tested coating, and after the spraying, coating will go up taper hole [6] and fill and lead up, and the upper surface of bracing ring [2] forms one and is coated with layer plane;
(2) at the coating surface gluing, the stiffening plate that is 1～5mm with a thickness sticks on the coating;
(3) sample is fixed on the stretching measurement mechanism, upwards applies power from the lower surface of bracing ring [2], clamping is stopped up the lower cylindrical body and is applied power downwards, pulls out from lower cone hole [7] until stopping up [1], records Bond Strength of Coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00107205 CN1109240C (en) | 2000-04-28 | 2000-04-28 | Method for measuring anchoring strength of coating and sample for measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00107205 CN1109240C (en) | 2000-04-28 | 2000-04-28 | Method for measuring anchoring strength of coating and sample for measurement |
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| Publication Number | Publication Date |
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| CN1321881A CN1321881A (en) | 2001-11-14 |
| CN1109240C true CN1109240C (en) | 2003-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00107205 Expired - Fee Related CN1109240C (en) | 2000-04-28 | 2000-04-28 | Method for measuring anchoring strength of coating and sample for measurement |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387964C (en) * | 2005-02-25 | 2008-05-14 | 宝钢集团上海梅山有限公司 | Method for making sample for testing spray coating pulling-resisting binding strength and clamp |
| CN101122561B (en) * | 2007-08-02 | 2010-06-30 | 上海交通大学 | Back penetration measuring method for film base binding performance |
| CN101451947B (en) * | 2008-12-29 | 2011-06-01 | 联合汽车电子有限公司 | Measuring appliance for axial direction bond strength of sphere type rivet electric contact and method thereof |
| CN101718678B (en) * | 2009-12-03 | 2011-06-22 | 东华大学 | Method for directly and quantitatively testing thermal spraying bonding strength |
| CN102928335A (en) * | 2012-10-08 | 2013-02-13 | 西安交通大学 | Biaxial drawing test piece for testing strength of thermal barrier coating |
| CN105445104B (en) * | 2015-12-17 | 2019-03-01 | 郑州磨料磨具磨削研究所有限公司 | Coating strength detects test specimen and preparation method thereof |
| CN105651615A (en) * | 2015-12-24 | 2016-06-08 | 吉林大学 | Pushing-off test method for testing bonding strength between surfacing layers and between surfacing layers and base metal as well as test pieces |
| CN106990043B (en) * | 2017-06-12 | 2019-11-12 | 中国矿业大学 | A kind of metal coating interface bond strength measuring device and method |
| CN108896404A (en) * | 2018-06-19 | 2018-11-27 | 中国铁路总公司 | A kind of prefabricated components are glued the experimental rig and its test method of seam tensile strength |
| CN109238958A (en) * | 2018-11-19 | 2019-01-18 | 广东省工业分析检测中心 | A kind of test method of the superpower bond strength of coating |
| CN109520923A (en) * | 2018-11-29 | 2019-03-26 | 哈尔滨汽轮机厂有限责任公司 | Metal Substrate workpiece surface sheet metal coating intensity detecting device in conjunction with ontology |
| CN109520924A (en) * | 2018-11-29 | 2019-03-26 | 哈尔滨汽轮机厂有限责任公司 | Metal Substrate workpiece surface sheet metal coating strength detecting method in conjunction with ontology |
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