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Preparation method for ceramic powder-reinforced metal-matrix welding layer, and powder feeding device thereof

A technology of ceramic powder and powder feeding device, which is applied in metal processing equipment, welding equipment, plasma welding equipment and other directions, can solve the problems of low utilization rate of powder, serious powder burning loss, and enhance the applicability of external powder feeding device, etc. The effect of avoiding serious burning loss, alleviating powder sinking, and good surfacing effect

Active Publication Date: 2018-11-06
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing ceramic powder-reinforced metal-based soldering layer and its powder feeding device, which aims at conveniently determining the falling point of the external powder feeding powder, and at the same time solving serious powder burning loss, low powder utilization rate and reinforcement Applicability of external powder delivery device

Method used

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  • Preparation method for ceramic powder-reinforced metal-matrix welding layer, and powder feeding device thereof
  • Preparation method for ceramic powder-reinforced metal-matrix welding layer, and powder feeding device thereof

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preparation example Construction

[0034] refer to figure 1 and figure 2 , a preparation method of ceramic powder reinforced metal-based welding layer, comprising the following steps:

[0035] Step S10, pretreating the metal matrix, alloy powder and ceramic powder;

[0036] Step S20, setting the plasma surfacing process parameters according to the metal base material, and determining the powder feeding temperature of the powder feeding device according to the properties of the alloy powder;

[0037]Step S30, place the pre-processed metal substrate on the workbench, turn on the plasma surfacing machine and the powder feeding device, and control the powder feeding device to move automatically, the temperature sensing device of the powder feeding device detects the temperature distribution of the molten metal pool and transmits the temperature field The control device 8 of the powder feeding device (computer can be used), the control device 8 matches the current temperature field data with the preset powder fee...

Embodiment 1

[0049] The metal matrix material is selected as hot work die steel 4Cr5MoSiV1, also known as H13 steel. H13 steel has a large hardening tendency, and it is directly surfacing on its surface, and the weld layer is prone to cracks. Therefore, it is necessary to pre-treat H13 steel before welding. Put H13 steel in a holding furnace to preheat to 300°C and keep it warm for half an hour. Then use a grinder to quickly polish the surface of the substrate to remove the oxide scale on the surface. The powder used in the experiment is Ni60A nickel-based self-fluxing alloy powder and WC ceramic powder. Put the powder into the external powder feeding container, cover the sealing cover, check whether the powder feeding of the welding machine is normal, and whether there is any powder blocking the pipeline. If the powder feeding works normally, put the processed H13 steel into the working table. Turn on the computer, plasma gas, shielding gas, and powder gas, start the welding machine, and...

Embodiment 2

[0051] Choose H13 steel for the metal matrix, choose Ni60A for the alloy powder, and choose Cr for the ceramic powder 3 C 2 . Clean and preheat the surface of the H13 steel substrate, dry and cool the powder, put Ni60A into the synchronous powder feeder, Cr 3 C 2 Load the external powder feeder. The powder feeding temperature of the powder feeding device is set at 2000°C, the welding current is 80A, the synchronous powder feeding speed is 10g / min, the welding torch forward speed is 50mm / min, the swing amplitude is 12mm, the swing frequency is 50c / min, and the nozzle distance is 9mm. The powder feeding speed is 6g / min. The front and rear swings of the external powder delivery pipe 2 are 3°, and the swing speed is 12° / S. Cr 3 C 2 The melting point of the powder is low, and it is easy to be burned when the temperature is too high, so the external powder feeding swing and swing speed can be appropriately reduced, and the powder feeding range can be reduced.

[0052] figu...

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Abstract

The invention discloses a preparation method for a ceramic powder-reinforced metal-matrix welding layer. The preparation method for the ceramic powder-reinforced metal-matrix welding layer comprises the following steps: carrying out pretreatment on a metal matrix, an alloy powder and a ceramic powder; setting plasma surfacing process parameters according to the material of the metal matrix, and determining a powder feeding temperature of a powder feeding device; placing the metal matrix on a workbench, starting up a plasma surfacing machine and the powder feeding device, enabling the powder feeding device to automatically travel, detecting the temperature distribution of a metal molten pool and transmitting a temperature field to a control device for the powder feeding device by a temperature induction device, calculating the position of a set powder feeding temperature in the molten pool to determine the position of the powder feeding device by the control device, and enabling the ceramic powder to fall into a specified temperature area in the molten pool by adjusting the included angle of an outer powder feeding pipe; and controlling the outer powder feeding pipe of the powder feeding device to carry out pendular movement. According to the preparation method for the ceramic powder-reinforced metal-matrix welding layer, determination for a powder falling point of outer powderfeeding is facilitated; and meanwhile, the problems of serious powder burning loss and low powder utilization rate are solved.

Description

technical field [0001] The invention relates to the technical field of preparing a hardened surface by plasma surfacing, in particular to a method for preparing a ceramic powder-reinforced metal-based welding layer and a powder feeding device thereof. Background technique [0002] The rapid development of modern industry requires mechanical components to be able to operate normally in harsh working environments. During the long-term service of the equipment, due to wear, corrosion, stress, alternating cold and heat, etc., the service life of the equipment is greatly reduced. This requires equipment working under high temperature and high stress to have excellent wear resistance, oxidation resistance and corrosion resistance. In order to improve material properties, material surface modification technology has become a hot topic. Among them, surfacing welding technology is simple, effective, and low-cost. In recent years, it has developed rapidly in the field of workpiece sur...

Claims

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Application Information

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IPC IPC(8): B23K10/02
CPCB23K10/027
Inventor 王华君江欣谕程旭东曾鲜饶润胤刘维刘松高野
Owner WUHAN UNIV OF TECH
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