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Anti-scratch iron-based surfacing material and preparation method thereof

A surfacing material and anti-scratch technology, which is applied in the field of surface engineering and surface wear resistance, can solve the problems of inapplicability to on-site construction, etc., and achieve the effects of good surfacing welding process, improved martensitic transformation temperature and good plasticity

Active Publication Date: 2021-05-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it needs to be made by hot isostatic pressing or powder sintering, which is not suitable for on-site construction

Method used

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  • Anti-scratch iron-based surfacing material and preparation method thereof
  • Anti-scratch iron-based surfacing material and preparation method thereof
  • Anti-scratch iron-based surfacing material and preparation method thereof

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specific Embodiment

[0033] 1. A nitrogen-containing iron-based scratch-resistant surfacing flux-cored welding wire, the wire composition weight ratio is: Cr: 22wt.%; Ni: 7.5wt.%; C: 1.2wt%; N: 0.1wt.%; Mn: 5wt.%; Si: 3.3wt.%; Mo: 2wt.%; Nb: 0.8wt.%; Fe balance. The flux-cored wire is partially filled with powder, and polyvinyl alcohol solution (pva) with a volume ratio concentration of 5% is used for agglomeration at a mass ratio of solution to powder of 1:10, and then the vacuum tube furnace is kept at 500°C for 2 hours for debinding , Use a sieve to select powder with a particle size of 100-200 mesh, put the mixed powder into a powder mixer and mix for 40 minutes to obtain the required powder, the flux core accounts for 30% of the total mass of the welding wire. The parameters of the plasma arc surfacing welding process are: plasma arc current 80A, stable arc current 50A, voltage 30V, wire feeding speed: 1000mm / min, and the plasma gas is output after a volume ratio of 20% nitrogen and 80% argon...

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Abstract

The invention discloses an anti-scratch iron-based surfacing material and a preparation method thereof, and belongs to the field of surface engineering. The surfacing material is prepared in a flux-cored wire mode. Raw materials of a flux core include chromium carbide powder, chromium nitride powder, electrolytic manganese powder, silicon powder, reduced iron powder, nickel powder, chromium powder, niobium powder and molybdenum powder, wherein the ranges of all the element components are as follows: 22-25 wt.% of Cr; 4-7.5 wt.% of Ni; 1.0-1.2 wt.% of C; 0.1-0.4 wt.% of N; 4-5 wt.% of Mn; 3.3-3.5 wt.% of Si; 1-2 wt.% of Mo; 0.6-0.8 wt.% of Nb and the balance of Fe. On one hand, elements, such as Cr, Mn, V and Nb, which have high chemical affinity with nitrogen are added into a surfacing material to increase the content of nitride; and on the other hand, nitrogen is introduced into a plasma surfacing atmosphere to reduce the loss of nitrogen in the surfacing process and increase the dissolved amount of nitrogen in a surfacing layer, a low-nickel austenite surfacing layer is obtained finally, and the scratch resistance of the surfacing layer is obviously improved due to the increase of the nitrogen content.

Description

Technical field: [0001] The invention belongs to the field of surface engineering, and the invention is mainly applied to the sealing surface of valves and the similar surface wear-resistant field under medium and low temperature conditions below 400°C that bear heavy loads. Background technique: [0002] Valve sealing is the key to the fluid delivery pipeline system, but when excessive load is applied to the sealing surface of the valve, the surface will often be stuck, scratched or even locked, which will affect the sealing effect. This problem is common in nuclear power, thermal power and other energy equipment extremely important. According to statistics, accidents caused by valve sealing surface failures in nuclear power plants in the world account for 1 / 4. For a long time, the surfacing welding material on the valve sealing surface is occupied by cobalt-based alloy (Stellite alloy). Cobalt-based alloy has high hardness, good corrosion resistance, cavitation resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/40Y02P10/20
Inventor 李辉王梦宇郭许航林健符寒光
Owner BEIJING UNIV OF TECH
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