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BNi-2 Brazing Paste

Electron beam freeforming, also known as EBAM, is a sort of energy beam technology that can be utilized to freeform nickel-based buildups that are deposited on type 321 stainless steel substrates. When compared to techniques that include diffusion brazing, this technology can be employed to accomplish epitaxial solidification in a time period that is less than two hours. During the BNi-2 Brazing Paste machining process, it can be utilized in locations that are difficult to access. The method is especially helpful in repairing fan blades, which are often damaged in the process.

The procedure was created for a fan blade that had significant amounts of degraded material on it. After depositing a Ti6Al4V substrate with a thickness of three millimeters, X-ray microcomputed tomography was used to examine the substrate. Nanoindentation measurements were also used as another method of analysis for the results. These tests assessed the effects of stiffness as well as the impacts of local hardening.

After the postdeposition stress relief heat treatment, a three-dimensional displacement mapping was carried out in order to gain a better understanding of the microstructure as well as the geometrical distortion. In order to complete the procedure, a wire feed was utilized, which was aimed axially towards the focal point of the electron beam. The focus point had a diameter of around 3 millimeters at its widest point. The buildup that was produced as a result had a thin wall structure and a BH that measured 50 millimeters. The maximum temperature that was attained for the maximum thickness was 1000 degrees Celsius, while the maximum temperature that was reached for the width was 1120 degrees Celsius.

The EBAM procedure was carried out with the assistance of a Sciaky EBAM system, which had an accelerating voltage of 60 kV. The system featured positioning devices that enabled the wire feed to be positioned axially on the surface of the deposit. These mechanisms were part of the system. During the metallographic investigation, this made it possible to observe the more intricate details. Throughout the process of accumulation, temperature profiles were taken at numerous locations along the deposit and analyzed. This was also used to determine which areas of the deposit contained the highest temperatures.

In addition, a high-resolution ESD map was produced so that the distribution of alloying elements in the Ti6Al4V deposit could be shown. In addition to this, it shown that a columnar prior-b phase progressively manifested itself on the surface of the deposit. In the vicinity of the interface region, the size of this phase was very modest, but it grew steadily greater as the buildup proceeded. To achieve epitaxial solidification in the most time and energy-effective manner, it was necessary to reduce the number of repeated remelting passes. This was accomplished by slowing down the welding process and maintaining tight control over the porosity.

BNi-2 brazing paste properties

In the process of brazing, the filler metal BNi-2, which is based on nickel, is employed. Boron is used in this alloy to lower the melting point of the material. It finds widespread application in the field of nuclear power generation as well as in the purification of drinking water. It is usable even at temperatures that are not particularly high.

In any brazing process, the temperature range that is used for brazing is one of the most important considerations. In an ideal situation, the joint ought to be shielded from a corrosive atmosphere, and the amount of time spent brazing ought to be meticulously managed. On the other hand, staying at the brazing temperature for the appropriate amount of time isn't always enough to stop carbide precipitation in the majority of Ni- and Co-base alloys. This is due to the fact that typical cooling rates are insufficient to avoid the precipitation of carbide.

When brazing with nickel-based alloys, it is essential to make use of a hydrogen (reducing) environment that has a high purity level of the furnace. This is because hydrogen can produce hydrogen embrittlement in steel. In addition, there should not be any impurities in the air in order to eliminate the possibility of reducible oxide deposits forming inside the furnace. When using induction coils as a source of heat, the interior of the furnace should be clean and devoid of any deposits of reducible oxide.

A very thin layer of oxide is generated on the surface of the base metal while the brazing process is being carried out. This oxide coating can cause poor brazing because it impedes the flow of thenickel brazing filler metal and makes the brazing process more difficult. However, if the brazing process is carried out in an atmosphere that is pressurized with a vacuum, the oxide film might not pose a problem at all.

In high-frequency induction brazing techniques, the presence of even a very thin oxide deposit might be problematic and cause the process to fail. In these kinds of circumstances, removing the flux residue can require the use of abrasive blasting.

According to the results of XRD examinations, the primary phases that could be found on the TiAl side of the brazed joint were Ti 3 Al, TiNi binary intermetallic compounds, and AlNi 3 compound. This interfacial microstructure was quite comparable to the one found in the forged TC4 system.

Also investigated was the wetting process of BNi2 filler metals over SLMed TC4 substrates. The findings demonstrated that there was no discernible difference in the wetting process regardless of the dwell temperature. In addition, it was discovered that the equivalent spreading radius was the same at each of the three temperatures. The temperature of 1020 degrees Celsius, at which the melting point of the BNi2 alloy was reached, served as the reference temperature for the brazing process.

Why choose TIJO Metal Materials BNi-2 Brazing Paste?

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