Application of HVOF Supersonic Spraying WC-10Co-4Cr in High Pressure Gate Valve（4）

       

Figure 2 Photomicrograph of Vickers hardness indentation of coating

Figure 2 Photomicrograph of Vickers hardness indentation of coating

图2涂层的维氏硬度压痕显微照片

FIG 2 coating Vickers hardness indentation photomicrograph

图2涂层维氏硬度压痕显微照片

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2.3, coating pressure-resistant sealing test

2.3, coating pressure-resistant sealing test

2.3，涂层耐压密封试验

2.3, pressure-proof coating experiments

2.3，耐压涂层实验

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This article first uses image analysis technology to semi-quantitatively analyze the porosity of the coating.

This article first uses image analysis technology to semi-quantitatively analyze the porosity of the coating.

本文首先使用图像分析技术对涂层的孔隙率进行半定量分析。

Firstly, using image analysis techniques, the porosity of the coating is semi-quantitative analysis.

首先，使用图像分析技术，对涂层的孔隙率进行半定量分析。

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Figure 3 shows the porosity test results of the coating obtained by spraying KF-65 powder through the JP8000 system.

Figure 3 shows the porosity test results of the coating obtained by spraying KF-65 powder through the JP8000 system.

图3显示了通过JP8000系统喷涂KF-65粉末获得的涂层的孔隙率测试结果。

3 is sprayed porosity KF-65 powder obtained by coating test results JP8000 system.

图3是通过喷涂孔隙率KF-65粉末获得的JP8000系统的涂层测试结果。

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In this experiment, two fields of view of the cross-section of the coating are randomly selected for analysis.

In this experiment, two fields of view of the cross-section of the coating are randomly selected for analysis.

在该实验中，随机选择涂层横截面的两个视场进行分析。

In this experiment two randomly selected field of view of a cross section of the coating was analyzed.

在该实验中，分析了涂层横截面的两个随机选择的视野。

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It can be seen from the figure that the porosity under the two fields of view is 1.6% and 1.4% respectively, and the average porosity is 1.5%.

It can be seen from the figure that the porosity under the two fields of view is 1.6% and 1.4% respectively, and the average porosity is 1.5%.

从图中可以看出，两个视野下的孔隙度分别为1.6％和1.4％，平均孔隙度为1.5％。

The figure shows, the porosity of the two fields of view, respectively 1.6% and 1.4%, an average porosity of 1.5%.

由图可知，两个视野的孔隙率分别为1.6％和1.4％，平均孔隙率为1.5％。

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Then the water pressure sealing test was carried out on the sprayed.

Then the water pressure sealing test was carried out on the sprayed.

然后对喷雾进行水压密封测试。

Experiments were then sealed on the water pressure resistance after spraying.

然后将实验密封在喷雾后的耐水压性上。

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Before the experiment, the coating of the working surface of the valve plate was finely ground and polished, and then the pressure test was carried out under a water pressure of 100Mpa (ultra high pressure), and the pressure duration was 30 minutes.

Before the experiment, the coating of the working surface of the valve plate was finely ground and polished, and then the pressure test was carried out under a water pressure of 100Mpa (ultra high pressure), and the pressure duration was 30 minutes.

在实验之前，将阀板的工作表面的涂层进行精细研磨和抛光，然后在100Mpa（超高压）的水压下进行压力测试，压力持续时间为30分钟。

Before the experiment, the valve plate face coated fine grinding, polishing, and then the pressure of 100Mpa pressure test (UHP) under pressing duration of 30 minutes.

实验前，对阀板表面进行精细研磨，抛光，然后在100分钟的压力下进行100Mpa的压力测试（UHP），持续30分钟的加压时间。

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After the pressurization is over, the experimental results show that there is no "sweating" or water seepage on the working surface of the valve plate, indicating that the sealing effect is good, and there will be no leakage under the water pressure of 100Mpa.

After the pressurization is over, the experimental results show that there is no "sweating" or water seepage on the working surface of the valve plate, indicating that the sealing effect is good, and there will be no leakage under the water pressure of 100Mpa.

加压结束后，实验结果表明，阀板工作面上无“冒汗”或渗水现象，表明密封效果好，在100Mpa的水压下也无渗漏现象。

After pressing, the experimental results show that none of a valve plate face, "sweating", water leakage, indicating good sealing effect, leakage does not occur at a water pressure of 100Mpa.

压制后，实验结果表明，阀板表面无“冒汗”，漏水现象，表明密封效果好，在100Mpa的水压下不会发生泄漏。

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Therefore, a coating with a porosity level of about 1.5% can be obtained, which can meet the water pressure sealing requirements below 100Mpa.

Therefore, a coating with a porosity level of about 1.5% can be obtained, which can meet the water pressure sealing requirements below 100Mpa.

因此，可以获得具有约1.5％的孔隙率水平的涂层，其可以满足低于100Mpa的水压密封要求。

Thus, a porosity level of around 1.5% in the coating, to meet the following 100Mpa pressure resistant sealing requirements.

因此，涂层中的孔隙率水平约为1.5％，以满足随后的100Mpa耐压密封要求。

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Figure 4 shows the water pressure-resistant sealing experimental device.