阅读说明：本技术 一种提高钛丝与环氧树脂界面剪切强度的方法 (Method for improving interface shear strength of titanium wire and epoxy resin ) 是由 孙颖 曹洪学 陈利 于 2020-06-15 设计创作，主要内容包括：本发明涉及一种利用常压等离子处理技术提高钛丝与环氧树脂界面剪切强度的方法,属于钛丝表面处理技术领域。采用常压等离子体射流仪工作气体对钛丝表面进行喷射处理,设计工作气体的扫描速度、气体流量和处理时间的最优方案。通过微脱粘实验测试钛丝环氧树脂的界面剪切强度结果表明：采用本发明的工艺方法制得的钛丝,当等离子体射流仪功率为150W,喷头与试样的处理间距为3～5mm,扫描速度为2mm/s,气体流量为15L/min A-(r) 0.15L/min 0-(2),处理时间为20s时,钛丝与树脂基体的界面剪切强度最好,比未处理试样的界面剪切强度高16％。该工艺方法易操作、效率高、清洁无污染,有利于拓展钛丝在碳纤维树脂基复合材料领域的应用。(The invention relates to a method for improving the interface shear strength of a titanium wire and epoxy resin by utilizing a normal-pressure plasma treatment technology, belonging to the technical field of titanium wire surface treatment. And (3) spraying the working gas of the normal-pressure plasma jet instrument on the surface of the titanium wire, and designing the optimal scheme of the scanning speed, the gas flow and the processing time of the working gas. The result of testing the interfacial shear strength of the titanium wire epoxy resin by a micro-debonding experiment shows that: when the power of the plasma jet instrument is 150W, the processing distance between the spray head and the sample is 3-5 mm, the scanning speed is 2mm/s, and the gas flow is 15L/min A for the titanium wire prepared by the process method r 0.15L/min 0 2 Titanium wire and at a treatment time of 20sThe interfacial shear strength of the resin matrix is preferably 16% higher than that of the untreated sample. The process method is easy to operate, high in efficiency, clean and pollution-free, and is favorable for expanding the application of the titanium wire in the field of carbon fiber resin matrix composite materials.)

1. A method for improving the interface shear strength of a titanium wire and epoxy resin by utilizing a normal pressure plasma treatment technology is characterized by comprising the following steps: and (3) spraying the surface of the titanium wire by adopting working gas of the atmospheric pressure plasma jet instrument, adjusting the treatment distance between the spray head and the sample, and designing the scanning speed, the gas flow and the treatment time of the working gas to obtain the titanium wire treated by the atmospheric pressure plasma jet instrument.

2. The method of claim 1, wherein: the power of the plasma jet instrument is 150W.

3. The method of claim 1, wherein: the working gas is a mixed gas of argon and oxygen.

4. The method of claim 1, wherein: the processing distance between the spray head and the sample is 3-5 mm.

5. The method of claim 1, wherein: the scanning speed was 2 mm/s.

6. The method of claim 1, wherein: the flow rate of the working gas is 15L/min A_r0.15L/min O₂Or 15L/min A_r0.30L/min O₂。

7. The method of claim 1, wherein: the treatment times were 10s, 20s and 40 s.

8. A method for improving the interfacial shear strength of a titanium wire and epoxy resin by utilizing an atmospheric pressure plasma treatment technology is characterized by being obtained by combining the treatment methods of any one of claims 1 to 7.

Technical Field

The invention relates to a method for improving the interface shear strength of a titanium wire and epoxy resin by utilizing a normal-pressure plasma treatment technology, belonging to the technical field of titanium wire surface treatment.

Background

Titanium has the characteristics of high specific strength, good corrosion resistance, heat resistance, good processing plasticity and the like. So far, titanium has been widely used in the engineering fields of aviation, aerospace, nuclear energy, ships, medical health, chemical engineering and the like, and has become an important strategic material, and has become a 'third metal' next to iron and aluminum. When the titanium wire is used as a composite material reinforcing material, the titanium wire has active chemical properties, and an oxide layer and pollution are easily formed on the surface, so that the surface energy is reduced, the bonding performance between the titanium wire and an epoxy resin interface is poor, and the mechanical property of the composite material is greatly influenced. The method has the advantages that impurities and weak interface layers on the surface of the titanium wire are removed, and the method has important significance for constructing a bonding surface with high surface energy and improving the mechanical property of the super-hybrid composite material.

The traditional ferrous metal surface treatment technology is mature, but the surface treatment technology of nonferrous metals is difficult, especially for titanium. The currently common surface treatment method for combining titanium metal and resin mainly comprises the following steps: mechanical treatment (sand blasting, mechanical corrosion), chemical treatment (alkali cleaning, nitric acid corrosion, hydrogen peroxide corrosion, activator oxidation), electrochemical treatment (chromic acid anodic oxidation, sodium hydroxide anodic oxidation), adhesive method and the like, but the above treatment methods have the problems of long reaction time, complicated process, poor environmental protection, reduced mechanical properties, secondary pollution and the like. The process method provided by the invention is easy to operate, high in efficiency, clean and pollution-free, and is beneficial to expanding the application of the titanium wire in the field of carbon fiber resin matrix composite materials.

Disclosure of Invention

The invention aims to provide a method for improving the interface shear strength of a titanium wire and epoxy resin by utilizing a normal-pressure plasma treatment technology, and solve the problem of poor bonding property of the titanium wire and the epoxy resin interface.

In order to achieve the aim, the technical scheme of the invention is to provide a method for improving the interface shear strength of a titanium wire and epoxy resin by using a normal pressure plasma treatment technology, which is characterized by comprising the following steps: spraying the surface of the titanium wire by using working gas of an atmospheric pressure plasma jet instrument, setting the power of the atmospheric pressure plasma jet instrument to be 150W, adjusting the processing distance between a spray head and a sample to be 3-5 mm, and designing the scanning speed of the working gas to be 2mm/s and the gas flow to be 15L/min A_r 0.15L/min O_O、15L/min A_r 0.30L/min O₂And the treatment time is 10s, 20s and 40s, and the titanium wire treated by the atmospheric pressure plasma jet instrument is obtained.

Experimental results show that when the power of the plasma jet instrument is 150W, the processing distance between the spray head and the sample is 3-5 mm, the scanning speed is 2mm/s, and the gas flow is 15L/min Ar 0.15L/min O₂When the treatment time is 20 seconds, the interfacial shear strength between the titanium wire and the epoxy resin matrix is preferably 16% higher than that of the untreated sample.

The invention relates to a method for processing titanium wires by using argon-oxygen mixed gas normal pressure plasma processing technology to improve the interface performance of the titanium wires and epoxy resin. The process method is easy to operate, high in efficiency, clean and pollution-free, is favorable for expanding the application of the titanium wire in the field of carbon fiber resin matrix composite materials, and has a good prospect.

The foregoing and other objects of the invention will become more apparent from the following detailed description of the embodiments of the invention. It should not be understood that the scope of the above-described subject matter of the present invention is limited to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention.

Drawings

FIG. 1 is a schematic view of an atmospheric pressure plasma jet instrument.

In the figure, 1 is a radio frequency input device, 2.A_r/O₂Gas input device, 3 spray head, 4 objective table, 5 transmission device, 6 plasma, 7 central electrode.

Detailed Description

In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

Example 1.

The invention provides a method for improving the interface shear strength of a titanium wire and epoxy resin, which is characterized by comprising the following steps: placing a titanium wire sample on an objective table 4 of a normal pressure plasma jet instrument, performing jet treatment on the surface of the titanium wire by adopting working gas of the normal pressure plasma jet instrument, and setting the work of the normal pressure plasma jet instrumentThe rate is 150W, the processing distance between the spray head 3 and the sample is adjusted to be 3-5 mm, the scanning speed of working gas is designed to be 2mm/s through the conveying device 5, and the gas flow is 15L/min A_r 0.15L/min O₂And the treatment time is 10s, and the titanium wire treated by the normal-pressure plasma jet instrument is obtained.

In the test and evaluation of this example, the effect of the modification treatment was measured by using a micro-debonding test. The micro-debonding experiment is a micro-test method for measuring the interfacial shear strength of the composite material, and can accurately measure the magnitude of the debonding instant force. Dipping a small amount of epoxy resin system solution by a fine needle, coating the epoxy resin system solution on a titanium wire treated by a normal-pressure plasma jet instrument to uniformly distribute resin microdroplets on the titanium wire, enabling the size of the resin microdroplets to be proper (about 400-500 mu m), automatically forming an ellipsoidal spindle body by the liquid drops under the action of surface tension, and curing for 6 hours at normal temperature. The resin droplets were pulled off the titanium wire at a speed of 0.1mm/s using an Instron 3343 tensile tester, whereby the magnitude of the shear force that caused shear failure at the interface between the resin and the titanium wire was measured, and the shear failure strength of the interface was calculated from the area of the interface between the titanium wire and the resin. The average interfacial shear strength (IFSS) of the titanium wire and the epoxy resin was calculated to be 12.68Mpa, which is 10% higher than the average interfacial shear strength of the untreated sample in comparative example 1.

In the embodiment, a pure titanium wire with the model number of TA2, the diameter of 0.05mm and the effective processing length of 20mm is selected.

The epoxy resin system solution of the embodiment is prepared by mixing the epoxy resin JL-155 and the special curing agent JH-196 according to the mass ratio of 100: 33 and uniformly stirring.

Example 2.

The treatment time in example 1 was set to 20 s. The other conditions and procedures were exactly the same as in example 1, and the average interfacial shear strength (IFSS) of the titanium wire and the epoxy resin was calculated to be 13.29Mpa, which is 16% higher than that of the untreated sample in comparative example 1, in the same manner as in example 1.

Example 3.

The gas flow rate in example 1 was set to 15L/min A_r 0.3L/min O₂The treatment time was 40 s. The other conditions and procedures were exactly the same as in example 1, and the average interfacial shear strength (IFSS) of the titanium wire and the epoxy resin was calculated to be 12.52Mpa, which is 9% higher than that of the untreated sample in comparative example 1, in the same manner as in example 1.

Comparative example 1.

The titanium wire which is not subjected to the atmospheric pressure plasma treatment technology is subjected to a micro-debonding experiment, other conditions and steps are completely the same as those of the example 1, and the average interfacial shear strength (IFSS) of the titanium wire and the epoxy resin is detected to be 11.49MPa by adopting the method the same as the example 1.

The results show that the average interfacial shear strength of the titanium wires obtained in examples 1-3 and the epoxy resin is superior to that of comparative example 1, that is, the interfacial shear strength of the titanium wires and the epoxy resin is improved by the technical method of the invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, various possible combinations of the features are not described separately.