Preparation method of surfacing coating on sealing surface of valve

A technology of valve sealing and surface stacking, which is applied in the coating, metal material coating process, etc., can solve the problems of small deformation, low mechanical bonding strength, thermal deformation and cracks, etc., and achieve the suppression of coating cracks and wear resistance The effect of improving and increasing the hardness of the coating

Pending Publication Date: 2021-05-28
WUXI SMART AUTO CONTROL ENG CO LTD
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Problems solved by technology

The coating is usually prepared by spraying, in which flame spraying and plasma spraying can produce metallurgical bonding, high bonding strength, but prone to th

Method used

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  • Preparation method of surfacing coating on sealing surface of valve
  • Preparation method of surfacing coating on sealing surface of valve
  • Preparation method of surfacing coating on sealing surface of valve

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preparation example Construction

[0034] A kind of preparation method of overlay welding coating on valve sealing surface, such as Figure 1-4 As shown, the sealing surface includes one or more sealing areas in the valve that are in direct contact with the medium, such as the ball and seat of the ball valve, the seat and the sealing ring of the butterfly valve, the gate plate and the seat of the gate valve, etc.

[0035] Including the following steps:

[0036] (1) Obtain cladding powder:

[0037] First mix the metal binder phase and the ceramic reinforcement phase according to the ratio, and then add 0.4~0.6% CeO 2 As a grain inhibitor, the cladding powder is obtained after fully mixing by mechanical means; the composite powder is weighed in proportion and mixed in a mixer for 2-4 hours, and the grinding balls use tungsten carbide balls. 1:8~10.

[0038] (2) Heating valve sealing surface:

[0039] The sealing surface of the valve needs to be heated to 150~200°C as a whole before cladding;

[0040] (3) Ins...

Embodiment 1

[0051] Example 1: Laser cladding is used to clad a composite hardened coating on the sealing surface of a 12-inch triple eccentric butterfly valve seat, the composition of which is 69.5% nickel-based alloy (grain size 45-75 μm): 30% 12Co-WC (grain size 24-45 μm )-0.5%CeO 2 (particle size 24-45μm), hardness 700~750HV 10 .

[0052] First, weigh the three powders in proportion and mix them in the mixer for 2-4 hours. The grinding balls are tungsten carbide balls, and the ratio of material to ball is 1:8~10. After the mixed powder is sieved, it is dried in a vacuum drying oven at a drying temperature of 150-200°C, and the powder accumulation thickness during the drying process is ≤5mm. The material of the valve body is CF8, and it needs to be preheated at 200°C for 1.5h as a whole. Laser cladding equipment with fiber laser and coaxial powder feeding cladding head are used for cladding operation. The cladding power is 2000W, the scanning speed is 250mm / min, the spot diameter is ...

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Abstract

The invention relates to a preparation method of a surfacing coating on a sealing surface of a valve. The preparation method of the surfacing coating on the sealing surface of the valve comprises the following steps of: (1) obtaining cladding powder: firstly blending a metal binding phase and a ceramic reinforced phase according to a proportion, then adding 0.4 to 0.6 percent of CeO2 as a grain inhibitor, and fully mixing through a mechanical method to obtain the cladding powder; (2) heating the sealing surface of the valve; (3) preserving heat, wherein a ceramic fiber heat preservation material is needed for whole-course heat preservation for a large-diameter valve part; and (4) forming a composite hardened coating: adopting a laser cladding mode to clad the mixed cladding powder on the preheated sealing surface of a valve body through a coaxial powder feeding mode so as to form the composite hardened coating. After the three kinds of powder are fully mixed and dried, the mixed powder is cladded on the sealing surface of the valve through a laser cladding technology to form the composite coating, so that the decarburization decomposition behavior of a ceramic phase is reduced, the grain size of the coating is refined, and the purpose of improving the hardness and the abrasion resistance of the coating is achieved.

Description

technical field [0001] The invention relates to the field of surface hardening of metal materials, in particular to a preparation method of a surfacing coating on a valve sealing surface. Background technique [0002] Nickel-based tungsten carbide coating is used as the wear-resistant sealing surface material of ball valves, gate valves and other valve bodies, and it shows better wear resistance than traditional cobalt-based alloys in a certain temperature and pressure range. The coating is usually prepared by spraying, in which flame spraying and plasma spraying can produce metallurgical bonding, high bonding strength, but prone to thermal deformation and cracks, requiring subsequent hot-melt treatment; high-speed flame spraying has small deformation, but higher mechanical bonding strength Low. Therefore, how to select the coating preparation process and optimize the process parameters, so as to control the microstructure, phase composition, internal defects and internal s...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C32/00C22C19/05B22F9/04
CPCC23C24/103C22C19/058C22C32/0052B22F9/04
Inventor 陈川辉曹玉祥郭强范逸
Owner WUXI SMART AUTO CONTROL ENG CO LTD
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