阅读说明：本技术 一种提高内孔涂层结合强度的喷砂粗化方法 (Sand blasting coarsening method for improving bonding strength of inner hole coating ) 是由 何勇 季强 黄勇 刘帆 宋鹏 于 2019-09-19 设计创作，主要内容包括：本发明公开了一种提高内孔涂层结合强度的喷砂粗化方法,包括对需要喷涂的表面进行清洁工作；配置喷砂砂料；利用喷砂设备向步骤S1中清洁后的表面进行喷砂处理,使被加工表面的粗糙度达到6<Ra<12；利用吹扫喷枪对喷砂后的表面进行清扫处理。本发明的有益效果是：本方案采用喷砂的方式能够对基材表面进行清洁处理,除去基材表面的铁锈、鳞皮、毛刺、焊渣、旧涂层等,起到净化、粗化效果,并且能够在基材的表面形成凹凸不平的粗糙面,增加基材与涂层的接触面积没有利于提高基材与涂层的连接强度,并且能够使基材产生压应力,减少基材的宏观残余应力,提高基材与涂层的疲劳强度。(The invention discloses a sand blasting coarsening method for improving the bonding strength of an inner hole coating, which comprises the steps of cleaning the surface to be sprayed; preparing a sand blasting material; performing sand blasting on the surface cleaned in the step S1 by using sand blasting equipment to enable the roughness of the surface to be processed to be 6< Ra < 12; and cleaning the surface subjected to sand blasting by using a blowing spray gun. The invention has the beneficial effects that: the mode that this scheme adopted the sandblast can carry out cleaning process to the substrate surface, detach the rust on substrate surface, scale, burr, welding slag, old coating etc. play and purify, the alligatoring effect, and can form unevenness's matte at the surface of substrate, increase the area of contact of substrate and coating and do not do benefit to the joint strength who improves substrate and coating, and can make the substrate produce compressive stress, reduce the macroscopic residual stress of substrate, improve the fatigue strength of substrate and coating.)

1. A sand blasting coarsening method for improving the bonding strength of an inner hole coating is characterized in that: the method comprises the following steps:

step S1: cleaning the surface of a base material to be sprayed;

step S2: preparing a sand blasting material;

step S3: performing sand blasting on the surface cleaned in the step S1 by using sand blasting equipment to enable the roughness of the surface to be processed to be 6< Ra < 12;

step S4: and cleaning the surface subjected to sand blasting by using a blowing spray gun.

2. The sand blasting coarsening method for improving the bonding strength of the inner bore coating of claim 1, wherein the method comprises the following steps: in the step S2, the sand material is white corundum and/or brown corundum, the sand material granularity is 24 meshes, 36 meshes and 60 meshes, and the sand material contains, by mass fraction, 15-20% of 24 meshes, 15-20% of 60 meshes and the balance of 36 meshes.

3. The sand blasting coarsening method for improving the bonding strength of the inner bore coating of claim 1, wherein the method comprises the following steps: the sand blasting frequency of the sand blasting equipment is 2 cycles, the downward feeding speed of the sand blasting spray gun is 4-8 mm/s, and the upward feeding speed of the sand blasting spray gun is 60-80 mm/s.

4. The sand blasting coarsening method for improving the bonding strength of the inner bore coating of claim 3, wherein the method comprises the following steps: the spraying angle of the sand blasting equipment is 75-90 degrees, the rotating speed of the spray gun is 60-150 rpm, the sand blasting pressure is 4.5-7 bar, the sand flow is 0.6-1.5 kg/min, and the sand of the sand blasting equipment is located in the center of the inner hole.

5. The sand blasting coarsening method for improving the bonding strength of the inner bore coating of claim 1, wherein the method comprises the following steps: the purging frequency of the purging spray gun is 2 cycles, and the feeding speed of the purging spray gun is 50-100 mm/s.

6. The sand blasting coarsening method for improving the bonding strength of the inner bore coating of claim 5, wherein the method comprises the following steps: the purging angle of the purging spray gun is 90 degrees, the rotating speed of the spray gun is 60-120 rpm, the purging air pressure is 4.5-7 bar, and the outlet of the purging spray gun is positioned in the center of the inner hole.

Technical Field

The invention relates to the technical field of thermal spraying, in particular to a sand blasting coarsening method for improving the bonding strength of an inner hole coating.

Background

Various failure modes of materials often start from the surface, so that the protection of the surface of the material is a very important research direction. Coating the surface of the workpiece with a coating is undoubtedly an economical and effective solution. In recent years, the development and application of coatings have received much attention. However, the coating material is generally different from the base material, and the coating is easy to fall off in a high-temperature environment, so that the coating fails.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a sand blasting coarsening method for improving the bonding strength of an inner hole coating, which is beneficial to improving the connection strength of the coating and a base material.

The technical scheme adopted by the invention for solving the problems is as follows: a sand blasting coarsening method for improving the bonding strength of an inner bore coating comprises the following steps:

step S1: cleaning the surface to be sprayed;

step S2: preparing a sand blasting material;

step S3: performing sand blasting on the surface cleaned in the step S1 by using sand blasting equipment to enable the roughness of the surface to be processed to be 6< Ra < 12;

step S4: and cleaning the surface subjected to sand blasting by using a blowing spray gun.

Further, in order to better implement the present invention, in step S2, the sand material is white corundum and/or brown corundum, the sand material has a particle size of 24 meshes, 36 meshes, and 60 meshes, and the sand material contains, by mass fraction, 15-20% of 24 meshes, 15-20% of 60 meshes, and the balance of 36 meshes.

Furthermore, in order to better realize the invention, the sand blasting frequency of the sand blasting equipment is 2 cycles, the downward feeding speed of the sand blasting spray gun is 4-8 mm/s, and the upward feeding speed is 60-100 mm/s.

Furthermore, in order to better realize the method, the spraying angle of the sand blasting equipment is 75-90 degrees, the rotating speed of a spray gun is 60-150 rpm, the sand blasting pressure is 4.5-7 bar, the sand flow is 0.6-1.5 kg/min, and the sand of the sand blasting equipment is positioned in the center of the inner hole.

Furthermore, in order to better realize the invention, the purging frequency of the purging spray gun is 2 cycles, and the feeding speed of the purging spray gun is 50-100 mm/s.

Furthermore, in order to better realize the invention, the purging angle of the purging spray gun is 90 degrees, the rotating speed of the spray gun is 60-120 rpm, the purging air pressure is 4.5-7 bar, and the outlet of the purging spray gun is positioned in the center of the inner hole.

The beneficial effect that this scheme obtained is:

(1) the mode that this scheme adopted the sandblast can carry out cleaning process to the substrate surface, detach the rust on substrate surface, scale, burr, welding slag, old coating etc. play and purify, the alligatoring effect, and can form unevenness's matte at the surface of substrate, increase the area of contact of substrate and coating and do not do benefit to the joint strength who improves substrate and coating, and can make the substrate produce compressive stress, reduce the macroscopic residual stress of substrate, improve the fatigue strength of substrate and coating.

(2) The scheme can control the roughness of the surface of the base material, activate the surface of the base material and be beneficial to forming good mechanical combination between the base material and the coating.

Drawings

Fig. 1 is a schematic diagram of sandblasting.

Wherein: 1-substrate, 2-sand blasting spray gun.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.