Piston ring

[0050] Table 1-2 shows the composition and performance parameters of the upper and lower ring bodies of the piston rings in Examples 1-4.

[0051] Table 1:

[0052]

[0053] Table 2:

[0054]

[0055] Through the above tests, the performance index of the obtained piston ring is better than that of the prior art, and its service life is greatly improved.

[0056] Attached below Figure 1-3 The structural improvement of the piston ring is described in detail.

[0057] The piston ring comprises an upper ring body 1 and a lower ring body 2, the upper ring body 1 and the lower ring body 2 are all provided with cross openings, the bottom surfaces of both ends of the upper ring body 1 are provided with bosses 3, and the lower ring body 1 The top surface of both ends of the body 2 is provided with grooves 4, and the boss 3 is connected with the groove 4. At the same time, the lower surface of the upper ring body 1 is evenly provided with a number of protruding rods 6, and the upper surface of the lower ring body 2 is evenly provided with Several small holes 5, the protruding rods 6 can be inserted into the small holes 5 to form a connection, the inner edge of the upper ring body 1 and the lower ring body 2 are also provided with mutually symmetrical semicircular grooves 7, the semicircular The grooves 7 are combined to form a large groove, and a sealing gasket is arranged in the large groove, and the sealing gasket is preferably a high temperature resistant rubber gasket. The surface of the upper ring body 1 and the lower ring body 2 is also provided with a multi-layer structure.

[0058] The exterior of the multilayer structure is also coated with a heat-conducting silica gel layer. In practice, the preferred solution is that the small holes 5 and the protruding rods 6 are all provided with 10, and the upper ring body 1 is the center of the circle respectively in the lower ring body 2. The upper surface and the lower surface of the upper ring body 1 are evenly distributed, the height of the boss 3 and the protruding rod 6 are consistent, both are 0.3mm, and the depths of the small hole 5 and the groove 4 are equal, both are 0.35mm. The position where the upper ring body 1 and the lower ring body 2 contact is also provided with a waterproof gasket for further sealing.

[0059] The multilayer structure on the piston ring will be described in detail below.

[0060] The multi-layer structure consists of base layer, periodic structure layer and wear-resistant layer. The base layer is made of ferrochrome alloy. The periodic structure layer consists of 5-20 layers, and each layer (each single layer) is composed of elements M1 and M2, wherein M1 is selected from aluminum, magnesium, and tin, and M2 is selected from titanium, vanadium, niobium, and tungsten. The periodic structural layer of the wear-resistant layer is composed of alternately laminated alloy layers composed of M1 and M2, wherein the content of M2 in the M1M2 alloy layer close to the base layer is more than 80%, and the content of M1 in the M1M2 layer close to the wear-resistant layer Above 80%, the remaining periodic structural layers between the M1M2 layer close to the base layer and the M1M2 layer close to the wear-resistant layer are from the inside to the outside (the position of the base layer is defined as the inside, and the position of the wear-resistant layer is defined as The content of M2 in each layer of the M1M2 layer formed for the outside) gradually decreases, and the content of M1 gradually increases. The multi-layer is composed of M1M2 alloy and the alloy layer constitutes the periodic structure layer. Taking the periodic structure layer including 9 single layers as an example, the weight percentage of M1 in the first layer near the base layer is 10%, and the weight percentage of M2 is 90%; the second layer next to the first layer The weight percentage of M1 in the middle layer is 20%, the weight percentage of M2 in the second layer is 80%, and so on, the ninth layer (that is, the single layer of the periodic structure layer close to the wear-resistant layer) of M1 The weight percentage is 90%, and the weight percentage of M2 in the ninth layer is 10%.