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Research on Brazing CBN Grains with Ag-Cu-Ti Filler Reinforced by TiN Particles

Author: ChenZhenZhen
Tutor: XuJiuHua
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Manufacturing and Automation
Keywords: CBN grains TiN reinforcing particles Ag-Cu-Ti alloys Composite solder Spreadability Interfacial reaction Brazing grinding head
CLC: TG454
Type: Master's thesis
Year: 2009
Downloads: 43
Quote: 0
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Abstract


Monolayer brazing cubic boron nitride (CBN) wheel by virtue of the high-temperature brazing at the interface between the abrasive grains, the brazing material layer, and wheel base body formed by the reaction chemistry and metallurgy combine to achieve a brazing filler metal layer on the CBN abrasive grains firmly dominated with abrasive outcrop height, wheel sharp, ample chip space is a significant advantage. Development of monolayer brazed CBN grinding wheel has made some progress, but the CBN abrasive brazing process, there are still some problems to be solved, such as: Ag-Cu-Ti solder intense flowing uneven thickness of the solder layer, after welding, the CBN grains angular solder layer clad difficult outcropped, and interfacial reaction between the CBN grains with brazing material in the brazing is difficult to active regulation resulting in abrasive excessive angularity losses, abrasive strength decreased. These problems hinder further improve the processing performance of the brazed CBN grinding wheel. To solve the above problems, this paper add TiN enhanced composite solder particles in the Ag-Cu-Ti alloy solder, brazed CBN grains of Experimental study. Of this work include: (1) the use of instruments such as three-dimensional video microscopy, scanning electron microscopy analysis TiN reinforcing particles of solder spreadability and microstructure of Ag-Cu-Ti, the use of electronic universal testing machine composite brazing alloy welded joint shear strength. Results show that adding the TiN particles, after the Ag-Cu-Ti alloy solder spreadability at 45 the surface of the steel substrate can be effectively controlled, the microstructure of the solder layer can be refined, the microhardness and solder of the solder layer The shear strength of the welding head has been markedly improved. (2) of the TiN particles enhance the interfacial reaction between the Ag-Cu-Ti composite solder layer and CBN grains and microscopic characteristics of the new compounds studied and test the static strength of the brazed CBN abrasive. Compared with the Ag-Cu-Ti alloy brazing CBN grains interfacial reactions, TiN particles inhibit the interfacial reaction, a significant reduction in the total amount of the reaction product makes brazing abrasive interface. TiN content within the range of 0 ~ 12 wt.%, The static strength of the braze CBN grains did not change significantly. (3) the composite solder brazed CBN abrasive morphology observed containing 4 ~ 8 wt.% TiN composite brazing CBN grains embedded depth suitable solder does not spread to the top of the CBN grains , abrasive edges and corners can be exposed, to ensure enough grip strength. Selection of the Ag-Cu-Ti brazing material containing 4 wt.% TiN particles in composite brazing material were produced brazed CBN grinding head, and its performance of the grinding of the titanium alloy of the dry grinding TC4 of the comparison test study, verification of the composite brazing material can be made for a better performance of the braze CBN wheelhead.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Brazing
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