Influence of TiX (X=B₂ or N) addition on the interfacial microstructure features of CBN grains and AgCuTi composite filler

Abstract

Joining experiments of CBN grains to AISI 1045 steel were conducted using Ag-Cu-Ti composite fillers containing TiX (X=B₂ or N) particles at 920 °C for 5 min. The influences of TiB₂ and TiN particles on the interfacial microstructure features between CBN and filler were investigated comparatively. The experimental results show that TiN particles are more effective than TiB₂ ones to control the interfacial reaction and particularly the resultants. Thermodynamic analysis reveals that the varied interfacial reaction induced by the addition of TiB₂ and TiN particles is mainly atttributed to the activity change of the B and Ti elements in the brazing reaction system.

Keywords

CBN / brazing / interfacial microstructure / chemical reaction / TiX addition

References

[1] Ghosh A., Chattopadhyay A. K. On Grit-failure of an Indigenously Developed Single Layer Brazed CBN Wheel[J]. Industrial Diamond Review, 2007, 1: 59-64.

[2] Ding W. F., Xu J. H., Fu Y. C., . Delamination Behavior and Formation Mechanism of the Interfacial Microstructure in the Brazed Joint of Silver-copper-titanium Alloy and Cubic Boron Nitride Grain[J]. Chinese Journal of Mechanical Engineering, 2008, 44(6): 61-65.

[3] Shiue R. K., Buljan S. T., Eagar T. W. Abrasion Resistant Active Braze Alloys for Metal Single Layer Technology[J]. Science and Technology of Welding and Joining, 1997, 2(2): 71-78.

[4] Zhang J., Naka M., Zhou Y. Brazing Si₃N₄ Ceramic using a Cu-Pa-Ti Filler Alloy for High-temperature Applications[J]. Journal of Materials Science, 2004, 39: 3159-3161.

[5] Xiong H. P., Li X. H., Mao W. Wetting Behavior of Co based Active Brazing Alloys on SiC and the Interfacial Reactions[J]. Materials Letters, 2003, 57: 3417-3421.

[6] Janickovic D., Sebo P., Duhaj P. The Rapidly Quenched Ag-Cu-Ti Ribbons for Active Joining of Ceramics[J]. Materials Science and Engineering A, 2001, 304–306: 569-573.

[7] Hanson W. B., Ironside K. I., Fernie J. A. Active Metal Brazing of Zirconia[J]. Acta Materialia, 2000, 48: 4673-4676.

[8] Yang J., Wu A. P., Zou G. S. Solid-liquid State Bonding of Si₃N₄ Ceramics with Ceramic-modified Brazing Alloy[J]. Tsinghua Science and Technology, 2004, 9(5): 601-606.

[9] Lin G. B., Huang J. H., Zhang H. Microstructure and Mechanical Performance of Brazed Joints of C-f/SiC Composite and Ti Alloy using Ag-Cu-Ti-W[J]. Science and Technology of Welding and Joining, 2006, 11(4): 379-383.

[10] Ding W. F., Xu J. H., Shen M. Thermodynamic and Kinetic Analysis of Interfacial Reaction between CBN and Titanium Activated Ag-Cu Alloy[J]. Materials Science and Technology, 2006, 22(1): 105-109.

[11] Li R. T., Pan W., Chen J. Thermodynamic Properties of Ti in Ag-Cu-Ti Alloys[J]. Materials Science and Engineering A, 2002, 335: 21-25.

[12] Kar A., Chaudhuri S., Sen P. K. Evaluation of Hardness of the Interfacial Reaction Products at the Alumina-stainless Steel Brazed Interface by Modeling of Nanoindentation Results[J]. Scripta Materialia, 2007, 57: 881-884.