Surface Treatment of Cubic Boron Nitride Grains Applied to Vitrified Bond Grinding Tools

2011 ◽  
Vol 675-677 ◽  
pp. 167-170 ◽  
Author(s):  
Zi Cheng Li ◽  
Ai Ju Zhang ◽  
Zhi Hong Li ◽  
Yu Mei Zhu
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Boron Nitride ◽  
Surface Treatment ◽  
Bonding Strength ◽  
Cubic Boron Nitride ◽  
Treatment Technique ◽  
Clean Surface ◽  
Excellent Method ◽  
Vitrified Bond

Cubic boron nitride (cBN) grains treated with hydrochloric acid, nitric acid and sulphuric acid were investigated, respectively. The results indicated that the surface treatment technique with hydrochloric acid was an excellent method for improving the properties of cBN grains. After hydrochloric acid treating, cBN grains with clean surface and satisfied strength were obtained. Moreover, the bonding strength between cBN grains and vitrified bond was increased significantly for application in vitrified bond grinding tools.

scholarly journals Influence of binder systems on sintering characteristics, microstructures, and mechanical properties of PcBN composites fabricated by SPS

2022 ◽  
Vol 11 (2) ◽  
pp. 321-330
Author(s):  
Shuna Chen ◽  
Hengzhong Fan ◽  
Yunfeng Su ◽  
Wensheng Li ◽  
Jicheng Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Bonding Strength ◽  
Cubic Boron Nitride ◽  
Critical Factor ◽  
High Hardness ◽  
High Porosity ◽  
Plasma Sintering ◽  
Mechanical Performances ◽  
Sintering Characteristics

AbstractCubic boron nitride (cBN) with high hardness, thermal conductivity, wear resistance, and chemical inertness has become the most promising abrasive and machining material. Due to the difficulty of fabricating pure cBN body, generally, some binders are incorporated among cBN particles to prepare polycrystalline cubic boron nitride (PcBN). Hence, the binders play a critical factor to the performances of PcBN composites. In this study, the PcBN composites with three binder systems containing ceramic and metal phases were fabricated by spark plasma sintering (SPS) from 1400 to 1700 °C. The sintering behaviors and mechanical properties of the composites were investigated. Results show that the effect of binder formulas on mechanical properties mainly related to the compactness, mechanical performances, and thermal expansion coefficient of binder phases, which affect the carrying capacity of the composites and the bonding strength between binder phases and cBN particles. The PcBN composite with SiAlON phase as binder presented optimal flexural strength (465±29 MPa) and fracture toughness (5.62±0.37 MPa·m1/2), attributing to the synergistic effect similar to transgranular and intergranular fractures. Meanwhile, the excellent mechanical properties can be maintained a comparable level when the temperature even rises to 800 °C. Due to the weak bonding strength and high porosity, the PcBN composites with Al2O3-ZrO2(3Y) and Al-Ti binder systems exhibited inferior mechanical properties. The possible mechanisms to explain these results were also analyzed.

A New CBN Crystal for Improved Grinding Performance in Vitrified Bonds

2008 ◽  
Vol 389-390 ◽  
pp. 211-216 ◽  
Author(s):  
Sridhar Kompella ◽  
Kai Zhang ◽  
Rajeev Pakalapati
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Grinding Performance ◽  
Wide Range ◽  
Inconel 718 Superalloy ◽  
Vitrified Bond ◽  
Crystal Synthesis ◽  
End Use ◽  
Cbn Crystal

The use of cubic boron nitride (CBN) over conventional abrasives in ferrous and superalloy grinding has resulted in improved manufacturing throughput and beneficial mechanical properties on workpiece surfaces. However, through the innovative use of crystal synthesis techniques, the grinding performance can be further improved over existing CBN crystals. In this study, such a new CBN crystal is developed, characterized, and its grinding performance is compared to a commercially available CBN crystal. Grinding tests are conducted in AISI M2 steel and Inconel-718 superalloy using a vitrified bond configuration with applicability in a wide range of end-use applications.

Effect of cobalt on properties of vitrified bond and vitrified cubic boron nitride composites

2020 ◽  
Vol 46 (4) ◽  
pp. 5337-5343 ◽  
Author(s):  
Xue Sun ◽  
Tianbiao Yu ◽  
Ying Chen ◽  
Chao Zhang ◽  
Zhelun Ma
Keyword(s):  
Boron Nitride ◽  
Cubic Boron Nitride ◽  
Vitrified Bond

Structural relationships in the synthesis of cubic boron nitride thin films by ion-assisted deposition

1994 ◽  
Vol 52 ◽  
pp. 638-639
Author(s):  
D. L. Medlin ◽  
T. A. Friedmann ◽  
P. B. Mirkarimi ◽  
M. J. Mills ◽  
K. F. McCarty
Keyword(s):  
Boron Nitride ◽  
Ion Irradiation ◽  
Cubic Boron Nitride ◽  
Film Stress ◽  
Bonded Phases ◽  
Structural Relationships ◽  
Precursor Material ◽  
Pressure Synthesis ◽  
Microstructure Of The Material

The allotropes of boron nitride include two sp2-bonded phases with hexagonal and rhombohedral structures (hBN and rBN) and two sp3-bonded phases with cubic (zincblende) and hexagonal (wurtzitic) structures (cBN and wBN) (Fig. 1). Although cBN is synthesized in bulk form by conversion of hBN at high temperatures and pressures, low-pressure synthesis of cBN as a thin film is more difficult and succeeds only when the growing film is simultaneously irradiated with a high flux of ions. Only sp2-bonded material, which generally has a disordered, turbostratic microstructure (tBN), will form in the absence of ion-irradiation. The mechanistic role of the irradiation is not well understood, but recent work suggests that ion-induced compressive film stress may induce the transformation to cBN.Typically, BN films are deposited at temperatures less than 1000°C, a regime for which the structure of the sp2-bonded precursor material dictates the phase and microstructure of the material that forms from conventional (bulk) high pressure treatment.

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