JP4980660B2 - Sealing agent, thermal spray coating member and bearing - Google Patents

Description

  The present invention relates to a sealing agent, a thermal spray coating member, and a bearing, and more particularly, to a resin-based sealing agent and a thermal spray coating member and a bearing obtained by treatment with the processing agent.

  A technique for improving the heat resistance, wear resistance, and corrosion resistance by spraying hard particles and powders such as metals or ceramics on the surface of a base material of a machine part composed of steel or the like has been practiced. In general, the thermal spray coating has pores such as voids, gaps, and voids generated in the process of forming the coating, and these pores impart various characteristics to the coating itself. Some of the pores show the form of communication holes that lead from the substrate surface to the substrate substrate, and communicate the environment where the coating surface layer is in contact with the substrate on which the coating is coated. There is a phenomenon in which the gas or liquid in contact with the outside of the thermal spray coating penetrates and diffuses to the base material through this communication hole. As a result, when the sprayed material itself deteriorates due to corrosion or when the base material is carbon steel, the substrate selectively deteriorates at the contact interface between the coating and the substrate, and the sprayed coating is bonded to the substrate. It may lose its properties and peel off. In addition, ceramic spraying may be performed for the purpose of ensuring insulation between the machine part main body and the member on which it is installed / provided, but the dielectric breakdown is caused by the above-mentioned gas and liquid penetration diffusion phenomenon, In some cases, the desired insulation resistance may not be exhibited.

Therefore, after forming a sprayed coating, a sealing treatment has been performed to improve the environmental barrier properties of the coating by some sealing treatment. As a general well-known sealing treatment method, a method of applying a sealing treatment agent in which a synthetic resin such as an epoxy resin, an acrylic resin, a urethane resin, a phenol resin, or a fluororesin is dissolved in an organic solvent is applied to the spray coating. , A method using a photocurable resin that is cured by visible light as a sealing agent (see Patent Document 1), and depositing and filling in the pores of the sprayed coating by the electrophoretic phenomenon of the paint particles with an electrodeposition paint (Refer to Patent Document 2), after spraying a sprayed material added with B ₂ O ₃ forming a vitreous material on the surface of the base material, the sprayed coating is heated to melt B ₂ O ₃ , and the sprayed coating A method of filling the gap generated inside (see Patent Document 3), adding a B ₂ O ₃ forming a vitreous substance to the sprayed material to form a coating, and then heating the molten B ₂ O ₃ which performs a pore filling effect (Japanese Document 3 reference) and the like are known. However, these methods have a problem that they are not suitable for industrial production methods, such as requiring special equipment and complicated steps in addition to the pressurization or decompression step.

Therefore, the essential composition of the sealing agent is at least selected from the group consisting of (i) a synthetic resin, (ii) a polymerizable organic solvent, and (iii) a fluorosurfactant and a perfluoro group-containing organosilicon compound. A method of containing one kind is known (see Patent Document 4). This method is intended to form a cured product when (i) the synthetic resin is cured, ((ii) the polymerizable organic solvent alone or in combination with (i) the synthetic resin). However, (ii) only by simple heating of the polymerizable organic solvent, dissolved oxygen or the like in the solution inhibits the polymerization, so that it is difficult to actually cure the solvent portion. In particular, when “styrene monomer”, which is a typical vinyl group-containing organic compound as shown in Examples of Patent Document 4, is used as a polymerizable solvent, the polymerization reaction is not sufficiently performed at the curing temperature of the epoxy resin. The unreacted polymerizable solvent remains in the epoxy resin, and there is concern about the long-term stability of the sealing resin after curing. For the purpose of accelerating the polymerization reaction of the polymerizable solvent, a radical polymerization initiator or the like is blended as described in Patent Document 4, and on the other hand, the oxygen dissolved in the sealing agent system is highly removed. Is required. However, high temperature type radical polymerization initiators are generally composed of organic peroxides that are highly reactive and have a high risk of explosion, so that they must be handled with care. On the other hand, if a low temperature type polymerization initiator is selected, such concerns are alleviated. However, since the decomposition reaction of the polymerization initiator proceeds even at a low temperature, it is necessary to pay attention to the pot life of the uncured sealing agent. In addition, from the viewpoint of the amount of dissolved oxygen, there is a problem that it is always required to observe fine precautions in order to improve storage stability.
Furthermore, a polymer obtained by polymerizing a polymerizable organic solvent such as “styrene monomer” has a problem of poor adhesion to a substrate.

As described above, in the prior art, in order to stably maintain the environmental barrier property of the coating, a very complicated process has to be set up in the operation of infiltrating the sealing agent to the substrate surface. In addition, there is a concern that it becomes difficult to maintain the environmental barrier property of the member subjected to the sealing treatment over a long period of time by newly generating a minute gap due to curing shrinkage of the sealing agent over time. Furthermore, there was a problem that it was inferior in adhesiveness with a base material.
JP-A-5-106014 JP-A-6-212391 JP-A-10-259469 Japanese Patent Laid-Open No. 2003-183806

    The present invention has been made in order to cope with such a problem, and dramatically improves the adhesion between the ceramic sprayed film and the substrate, and the adhesion over time after being left at a high temperature or after a heat cycle test. It is an object of the present invention to provide a sealing agent, a spray coating member, and a bearing using the same.

  The sealing agent of the present invention is a thermal spray coating sealing agent that contains an epoxy group-containing component and a curing agent, and does not contain a polymerizable vinyl group-containing solvent. A polyglycidyl ether compound having 3 or more epoxy groups contained therein is an essential component, and is selected from an alkylene diglycidyl ether compound having 2 epoxy groups in one molecule and a cyclic aliphatic diepoxy compound. The sealing agent is characterized in that the epoxy group contained per 1 g of the sealing agent is set in the range of 3.0 mmol to 4.0 mmol.

The thermal spray coating member of the present invention is a thermal spray coating member having a thermal spray coating sealed with the above sealing agent on a metal substrate.
The bearing according to the present invention is characterized in that the thermal spray coating member is formed on the surface of the bearing constituent member.

  Since the sealing agent of the present invention contains 3.0 mmol to 4.0 mmol of epoxy group per 1 g of the sealing agent, an ether bond or a hydroxyl group generated by ring-opening polymerization of the epoxy group contained in the sealing agent. The amount of is optimized. Therefore, it is possible not only to improve the adhesion between the substrate and the sprayed film, but also to improve the adhesion between the sprayed film by infiltrating the sprayed film with a high adhesive property into the sprayed film. Deterioration of adhesive strength can be prevented even when left standing or in a rapid heat cycle environment.

  In addition, since the thermal spray coating member of the present invention is formed using the above-mentioned sealing agent, it has excellent permeability and filling properties with respect to pores (gap) of the thermal spray coating, and the surface layer portion of the thermal spray coating is ground after the sealing treatment. Or, even if it is removed by polishing, there is a sufficient penetration / filling layer of the sealing agent, and as a result, the substrate protection of the coating is greatly improved, and the adhesion between the substrate and the sprayed coating is only improved. Therefore, the adhesive force between the sprayed films can be improved and used for bearings.

As a result of intensive investigations on the sealing agent that can prevent the degradation of the sealing properties of the thermal spray coating material and breakage of the thermal spray coating during use, the epoxy group concentration of the sealing agent is 3.0 mmol / g to 4.0 mmol / g. The sprayed coating that has been sealed using the sealing agent thus formed has excellent permeability and filling ability to pores (gap), and even if the surface layer portion of the sprayed coating is ground or polished after the sealing treatment, it is sealed. There is a sufficient permeation / filling layer for the pore treatment agent. As a result, the substrate protection of the coating is greatly improved, and not only the adhesion between the substrate and the sprayed coating is improved, but also the adhesion between the sprayed coating. It has been found that can be improved.
In the sealing treatment, the porous material after thermal spraying is treated by application or spraying. Thereafter, the uncured resin is cured by baking. At that time, the treated sealing agent penetrates into the minute voids inside the porous material and is then heat-cured to form a three-dimensional network structure. At that time, in the presence of the curing agent and the curing catalyst, the penetrated epoxy resin undergoes a cleavage reaction of the oxirane ring, and newly forms an ester bond, an ether bond or the like according to the type of the curing agent to form a cured product.
When an acid anhydride curing agent is selected as the curing agent type and an amine compound is selected as the curing catalyst, an ester bond is formed. This bond has a strongly polar part in the structure, and shows a very strong adhesive action between the sealing agent and a member made of ceramic or cermet treated with the sealant, bearing steel, cast iron or the like.
Further, since the sealing agent does not contain a polymerizable vinyl group-containing solvent, by effectively suppressing the generation of voids due to volatilization of the solvent, sealing is performed until substantially all the gaps of the sprayed coating material are filled. This is considered to be due to the ability to perform hole treatment. The present invention has been completed based on such findings.

The epoxy group-containing component that can be used in the present invention is a polyglycidyl ether compound having 3 or more epoxy groups in one molecule as an essential component, and an alkyl group having 2 epoxy groups in one molecule. It is a mixture containing at least one selected from a range glycidyl ether compound and a cycloaliphatic diepoxy compound. Moreover, when it is set as a sealing agent, if it is an epoxy group containing component which can contain 3.0 mmol-4.0 mmol of epoxy groups per 1 g of this sealing agent, it can be used.
When the compounding ratio of the epoxy group is outside the range of 3.0 mmol to 4.0 mmol, the adhesion with the substrate is inferior.
The polyglycidyl ether compound and the cycloaliphatic diepoxy compound are compounds that do not contain a repeating unit formed by cleavage of an oxirane ring in the molecule.

Examples of the polyglycidyl ether compound having 3 or more epoxy groups in one molecule include triglycidyl ether compounds and tetraglycidyl ether compounds.
Examples of the polyglycidyl ether compound include trimethylolpropane polyglycidyl ether, glycerol triglycidyl ether, and sorbitol polyglycidyl ether.
Among these, from the viewpoint of lowering the viscosity of the sealing agent, a triglycidyl ether compound is preferable, and trimethylolpropane polyglycidyl ether is particularly preferable.

  Examples of the alkylene diglycidyl ether compound having two epoxy groups contained in one molecule include neopentyl glycol diglycidyl ether, glycerol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, 1,6- Mention may be made of hexanediol diglycidyl ether.

The cycloaliphatic diepoxy compound having two epoxy groups contained in one molecule is a so-called alicyclic compound in which two adjacent carbon atoms form an oxirane ring. Examples of the alicyclic epoxy compound include an alicyclic diepoxy compound containing two oxirane rings, such as 1,2,8,9-diepoxy limonene. It is a preferred compound that effectively prevents the physical properties of the treated product from being lowered while lowering the viscosity of the sealing agent.
Further, diglycidyl ethers of alicyclic compounds such as hydrogenated bisphenol A and diglycidyl ether of tetrahydrophthalic acid can also be used.

The sealing agent of the present invention contains a monoglycidyl ether compound having one epoxy group contained in one molecule for the purpose of improving the handleability and further improving the permeability to the spray coating material. be able to.
Examples of the monoglycidyl ether compound having one epoxy group contained in one molecule include known monoglycidyl ether compounds such as alkyl monoglycidyl ethers such as butyl glycidyl ether and alkylphenol monoglycidyl ethers.

A curing agent is blended with the epoxy group-containing component. As the curing agent, a known epoxy resin curing agent such as an acid anhydride and an aliphatic amine compound, an alicyclic amine compound, an aromatic amine compound, or an imidazole may be used alone or in combination. Can do.
In the present invention, acid anhydrides are preferred as the curing agent. When an acid anhydride curing agent is selected as the curing agent type and an amine compound is selected as the curing catalyst, an ester bond is formed. This bond has a strongly polar part in the structure, and shows a very strong adhesive action between the sealing agent and a member made of ceramic or cermet treated with the sealant, bearing steel, cast iron or the like.
Ceramic materials are generally brittle materials, and when they are formed into a porous film by thermal spraying, they are in close contact with the base material due to the anchor effect, so thermal stress and vibration during use There is a concern that peeling easily occurs. There was also a risk that microcracks would occur even if no peeling occurred. Therefore, by impregnating the thermal spray film with a highly adhesive sealing agent, not only the adhesion force between the substrate and the thermal spray film can be improved, but also the adhesive force between the thermal spray films can be improved.

Examples of the acid anhydrides include phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bistrimellitate, glycerol trislimitate, maleic anhydride, tetrahydrophthalic anhydride, methyltetrahydro Phthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, methylbutenyltetrahydrophthalic anhydride, succinic anhydride, dodecenyl succinic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylcyclohexene Examples thereof include dicarboxylic acid anhydrides and derivatives thereof.
Examples of amine compounds include chain aliphatic polyamines such as diethylenetriamine and triethylenetetramine, cyclic aliphatic polyamines such as N-aminoethylpiperazine and isophoronediamine, aliphatic aromatic amines such as xylylenediamine, metaphenylenediamine, and diaminodiphenylamine. And aromatic amines and derivatives thereof.
Of these, acid anhydride curing agents with a viscosity at 25 ° C of 50 mPa · s or less, and aliphatic amine curing agents with a viscosity at 25 ° C of 10 mPa · s or less, Since the viscosity can be remarkably lowered, it becomes a suitable curing agent.
In particular, an acid anhydride curing agent that can increase the pot life of the sealing agent is preferable.

  The blending ratio of the epoxy group-containing component and the acid anhydride curing agent is preferably in the range of [(epoxy group-containing component / acid anhydride curing agent) = (80/100) to (95/100)] in terms of equivalent ratio. .

The sealing treatment method comprises applying the sealing treatment agent of the present invention to a thermal spray coating formed by a known thermal spraying method on a surface of a base metal such as steel with a metal, alloy, oxide ceramics, carbide cermet or the like. It is used to seal the pores of the thermal spray coating.
Al, Zn, Cr, Ni etc. as the metal used as the spray material, stainless steel etc. as the alloy, alumina, zirconia, titania etc. as the oxide ceramics, chromium carbide, tungsten carbide etc. as the carbide cermet, Each can be mentioned.
As the spraying method, for example, a plasma spraying method, a high-speed gas flame spraying method, or the like can be used. The film thickness of the thermal spray coating can be appropriately set according to the type of the thermal spray material and the use of the resulting thermal spray coating coating member, but usually when carbon steel is the base material and the thermal spray material is alumina, 20 ~ It is about 2000 μm, preferably about 50 to 1000 μm.

In the above sealing treatment method, the filling property of the sealing agent depends on the particle boundary fusion structure forming the thermal spray coating to be treated. It is desirable to select an optimum sealing agent suitable for the required properties of the thermal spray coating.
For example, the sealing agent of the present invention is preferably used for sealing treatment when the formed sprayed coating has a porosity of 10% or less. Further, the sealing agent of the present invention exhibits a very excellent sealing effect, and the sealing effect can be confirmed even if the surface layer is removed by grinding, for example, about 200 μm.
As described above, by using the sealing agent of the present invention, the pores (gap) of the sprayed coating are substantially completely filled with the resin obtained by polymerizing the epoxy group. The thermal spray coating covering member which has can be obtained.
Here, the pores (gap) of the sprayed coating are “substantially all filled” means that the layer formed by the sealing agent existing in the form of a coating on the surface of the sprayed coating (sealing agent) In the dye penetration test based on JIS H 8666, the outermost layer part (for example, about 0.2 mm thick from the surface) of the thermal spray coating including the cured product of the components contained in the material is removed by grinding and polishing. , Meaning no coloration.

The above-mentioned sealing treatment method allows the above-mentioned sealing agent to penetrate to the bottom of the thermal spray coating and improve the filling property, thereby filling the gaps between the particles with certainty, thereby ensuring the individual bonding force between the particles and the base. The adhesion force with the material is increased, and all the gaps between the boundaries between particles can be filled. For this reason, the penetration | invasion of environmental moisture and a foreign material in air | atmosphere is interrupted | blocked, and the fall of an insulation resistance value and a dielectric breakdown value can be suppressed, without reducing the intrinsic | native value of an oxide ceramic sprayed coating. Further, the obtained thermally sprayed coating after sealing does not have an exposed gap even when the surface is ground or polished.
Therefore, it can be used as a means for increasing the mechanical strength of the sprayed coating itself and the adhesion strength with the base material, a means for suppressing a decrease in electrical characteristics such as an insulation resistance value and a dielectric breakdown value, and the like.

  When the sealing treatment is performed using the sealing treatment agent of the present invention, the gap between the thermal spray coatings is substantially filled with the sealing treatment agent, and then the coating with the sealing treatment agent is performed so as to conceal the surface layer of the thermal spray coating. A film-like thin layer is formed. The coated member having a thin layer in the form of a coating can be used as it is, but in order to maintain the dimensional accuracy of the coated member, the surface of the sprayed coating is ground and ground using a grinding wheel, abrasive paper, non-woven buff, etc. Such a layer can be removed by polishing.

  The sealing treatment is preferably performed quickly on the sprayed coating after spraying. The thermal spray coating is a coating formed by fusing a large number of particles having a particle size distribution only at the interparticle surface layer. Since gaps are inevitably generated at the particle boundaries, it is often affected by environmental conditions such as moisture and foreign matter entering through the gaps at the grain boundaries immediately after the formation of the coating. Therefore, in order to prevent a decrease in the sealing efficiency, it is desirable to perform the sealing treatment of the sprayed coating as soon as possible after spraying.

The thermal spray coating member of the present invention is formed by spraying hard particles such as metal or ceramics and powder on the surface of a base material of a machine part composed of steel or the like to form a thermal spray coating, and then the sealing treatment agent of the present invention. Is a covering member obtained by performing a sealing process until the gap between the sprayed coating materials is substantially filled. Therefore, the obtained thermal spray coating coating member is coated with a thermal spray coating on which the mechanical strength and adhesion strength with the base material are enhanced and electrical characteristics such as insulation resistance value and dielectric breakdown value are improved. As a result, the machine parts can be completely shielded from the surrounding environment to prevent and protect water and foreign matter from entering.
Further, the dimensional accuracy of the covering member can be maintained by grinding and polishing the surface of the sprayed coating using a grinding wheel, polishing paper, non-woven cloth buff or the like.

The thermal spray coating member of the present invention can be suitably applied to the surface of a member constituting a bearing. As a bearing, it can be used for either a rolling bearing or a sliding bearing. In a rolling bearing, an inner ring having an inner ring rolling surface on an outer peripheral surface and an outer ring having an outer ring rolling surface on an inner peripheral surface are arranged concentrically, and a plurality of rolling bearings are provided between the inner ring rolling surface and the outer ring rolling surface. A moving object is arranged. Furthermore, it is comprised with the sealing member fixed to the holder | retainer and outer ring | wheel etc. which hold | maintain these rolling elements.
The thermal spray coating member of the present invention can be suitably used as a sealing agent for a ceramic thermal spray coating to be processed on the outer ring portion of rolling bearings such as deep groove ball bearings and cylindrical / conical roller bearings.
The bearing whose outer ring surface has been treated with the thermal spray coating member is fixed by being pressed into the housing while sliding the outer diameter surface of the outer ring. By providing the thermal spray coating member of the present invention, the thermal spray coating is strengthened by the action of the encapsulating resin, so that the risk of damage to the coating due to collision with the housing that can occur during press-fitting can be reduced.
Moreover, the thermal spray coating covering member of the present invention can also be used as a sliding surface of a slide bearing.

Examples 1 to 4 and Comparative Examples 1 to 3
The materials used in Table 1 are shown below.
(1) Glycidyl ether compound or cycloaliphatic diepoxy compound (1-1) Trimethylolpropane triglycidyl ether: manufactured by Nagase ChemteX Corporation, Denacol EX-321L, viscosity: 500 mPa · s (25 ° C.)
(1-2) Alkylene diglycidyl ether: manufactured by Japan Epoxy Resin Co., Ltd., YED216M, viscosity; 15 mPa · s (25 ° C.)
(1-3) Alkylene monoglycidyl ether: manufactured by Japan Epoxy Resin, YED111E, viscosity; 7 mPa · s (25 ° C.)
(1-4) Cycloaliphatic diepoxy compound: Daicel Chemical Industries, Celoxide 3000, viscosity; 10 mPa · s (25 ° C.)
(2) Curing agent, curing accelerator (2-1) Acid anhydride curing agent: Dainippon Ink & Chemicals, Epicron B-570, viscosity; 40 mPa · s (25 ° C)
(2-2) Imidazole-based curing accelerator: Shikoku Kasei Kogyo Co., Ltd., OR-2E4MZ
(3) Polymerizable vinyl group-containing solvent (3-1) Styrene monomer: Wako Pure Chemical Industries, reagent

Each component shown in Table 1 was sufficiently stirred and mixed at room temperature, and allowed to stand for 30 minutes to remove bubbles in the mixed resin, thereby obtaining a sealing agent. Prepare a SUJ2 test piece (hereinafter referred to as “test piece base material”) with a diameter of 20 mm × 25 mm for the obtained sealing agent, and apply an alumina ceramic sprayed film with a film thickness of 400 μm on the cylindrical end face of the plasma spray Formed by the method.
On the surface of the sprayed surface, the sealing agent shown in Table 1 was applied using a polyamide brush in a room temperature atmosphere and allowed to stand for 30 minutes. Thereafter, a test piece coated with a sealing agent was prepared by scraping off the excess sealing agent on the surface with a polyethylene spatula. Thereafter, these coated test pieces were pre-fired at 80 ° C. for 1 hour, and then fired at 120 ° C. for 2 hours to cure the sealing agent and obtain a cured test piece. Next, grinding removal was performed using a diamond grindstone parallel to the ceramic plane. The amount of grinding removal was about 200 μm deep from the surface of the cured specimen.
The grinding test specimen obtained by grinding and removing the surface of the cured specimen was left at -20 ° C for 1 hour, then heated to 120 ° C and allowed to stand for 1 hour for 500 cycles. A heat cycle treated specimen was obtained. Separately, a high-temperature test specimen was obtained by leaving it at 150 ° C for 5000 hours.
The obtained heat cycle treatment test piece and the high temperature storage treatment test piece were subjected to the adhesion test shown below to evaluate the durability of the test piece with respect to the heat cycle treatment and high temperature storage treatment.

<Adhesion test>
An outline of the adhesion test is shown in FIG. A tensile jig 3 (adhesive shape: φ16 mm) is bonded to the cured test piece 1 whose surface layer portion after firing is removed by grinding to 200 μm via a high-viscosity epoxy adhesive at the epoxy adhesive surface 2a. The adhesion of the thermal spray coating 2 per unit area was measured by pulling in the direction of the arrow with a testing machine. The measurement results are shown in Table 1 and FIG. Judgment criteria are “possible” when the adhesion is 2 MPa or more, and “impossible” when it is below 2 MPa.

As shown in Table 1 and FIG. 2, the sealing agent of each example is in close contact even after heat cycle and after being left at high temperature by blending the epoxy group in an amount of 3.0 to 4.0 mmol / g. The force exceeds 2 MPa.
In any of the comparative examples, the adhesion after the heat cycle test and the high temperature storage test was not possible. This is because when the amount of the epoxy group-containing component blended in the sealant is less than 3.0 mmol / g, the proportion of polar groups that have the effect of improving the adhesion to the substrate is relatively insufficient, and the adhesion It is thought that it fell. In addition, as the amount of the epoxy group-containing component increases, particularly when it exceeds 4.0 mmol / g, the rigid epoxy bond in the cured product becomes excessive, and the toughness of the cured product is greatly reduced. It is considered that microcracks were easily generated due to the thermal stress applied between the coating and the substrate in the heat cycle test, resulting in cohesive failure with a small load.

The sealing agent of the present invention was sealed by blending the epoxy group concentration to be 3.0 mmol / g to 4.0 mmol / g with respect to the sealing agent composition when uncured (before sealing treatment). Since the pore agent exerts its strong adhesive strength to the maximum, even after a long-time heat cycle test and high-temperature storage test, the chemical adhesive strength is greater than the adhesive strength due to the anchor effect, which is the main component of the thermal spray coating adhesion strength. Can be added.
The thermal spray coating coated member of the present invention can be used in a severe environment such as a bearing because it can be expected to have a long-term adhesion between the thermal spray coating and the substrate even for applications where temperature fluctuations vary greatly. Can be used for products.
In addition, since the spray coating member of the present invention has a 200 μm grinding removal, there is still a sufficient penetration / filling layer of the sealing agent, so even if the surface layer portion of the spray coating is ground or polished after the sealing treatment, It can be expected that the abrasion resistance of the thermal spray coating will be greatly improved and further physical properties such as mechanical properties will be improved. For this reason, it can utilize suitably as a member for protection of a thermal-sprayed coating of various industrial machine parts comprised from steel etc. which require high-precision post-processing, and a modification member.

It is a figure which shows the outline of an adhesive force test. It is a figure which shows the result of an adhesive force test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Curing test piece 2 Sealed sprayed coating 3 Tensile jig

Claims (3)

A sealant for a thermal spray coating containing an epoxy group-containing component and a curing agent, and containing no polymerizable vinyl group-containing solvent,
The epoxy group-containing component includes a polyglycidyl ether compound having 3 or more epoxy groups contained in one molecule as an essential component, and an alkylene diglycidyl ether compound having 2 epoxy groups contained in one molecule. And a mixture comprising at least one selected from cycloaliphatic diepoxy compounds,
The said sealing agent is the sealing agent characterized by having set the epoxy group contained per 1 g of this sealing agent in the range of 3.0 mmol-4.0 mmol. A thermal spray coating member having a thermal spray coating sealed with a sealing agent on a metal substrate,
The thermal spray coating member according to claim 1, wherein the sealing agent is the sealing agent according to claim 1.   3. A bearing in which a thermal spray coating member is formed on the surface of a bearing component member, wherein the thermal spray coating member is the thermal spray coating member according to claim 2.

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