Growth and characterization of thick cBN coatings on silicon and tool substrates

“…The deposition of cBN films with thicknesses of more than 2 Am on silicon substrates and nearly 1 Am on cemented carbide cutting inserts at temperatures of < 600 -C was successfully performed in our laboratory [8 -10]. First results on application tests with such coatings were published recently [11].…”

Section: Introductionmentioning

confidence: 99%

Boron containing combination tool coatings—characterization and application tests

et al. 2006

Self Cite

View full text Add to dashboard Cite

“…of bilayers Young Modulus [GPa] No. of bilayers Many factors are attributable to improving hardness, Young modulus, and adhesion of the coating [5,6,8,9], among these is the deposition of a 300-nm thick TiN adhesion layer, which has a good compatibility to steel substrate and to the subsequent B 4 C film. Also important is the introduction of a compositional gradient of BCN, which allows a smooth and continuous transition of the mechanical properties from B 4 C to c-BN coatings.…”

Section: Resultsmentioning

confidence: 99%

“…Another factor is that densification of the coating system using nanometric multilayers avoids humidity diffusion to the substrate, which normally contributes to film delaminating. Additionally the inclusion of the TiN adhesion layer and of the softer BCNgradient/B 4 C multilayer lead to a reduction of the induced compressive stress in the film, so that the total residual stress of the coating decreases and its adhesion increases [5,[9][10][11]. Critical load [N] No.…”

Section: Resultsmentioning

confidence: 99%

Cutting tool performance enhancement by using a B₄C/BCN/C‐BN multilayer system

Gaitán

Caicedo

Balogh

2007

Phys. Status Solidi (c)

View full text Add to dashboard Cite

Thin films of B 4 C/BCN/c-BN multilayers were deposited on to AISI M2 high speed steel substrates by r.f. (13.56 MHz) multi-target magnetron sputtering from high purity (99.99 %) h-BN and a (99.5%) B 4 C target, in an Ar (90%)/N 2 (10%) gas mixture. For their deposition we varied the bias voltage of the B 4 C films between -50 and -250 V and, for the BCN coatings the nitrogen gas flow from 3% to 12%. A 300-nm thick TiN buffer layer was first deposited to improve the adhesion of all samples. Mechanical properties like hardness, elastic Young modulus, and adhesion were determined by nanoindentation and scratch measurements. Finally, cutting tools were coated with 2, 5, 12, and 16 bilayers of B 4 C/BCN/c-BN. Machining tests on steel bars and plates were carried out. Tool performance was registered as functions of bilayer numbers showed enhancement between 60% and 107% and a surface roughness reduction of 60% for cutting tools coated with 16 bilayers, compared to uncoated tools.

show abstract

“…Generally, cBN materials are fabricated by sintering with binder metals. cBN are also used to coat only a part of the 9 cutting edge of silicon or cemented carbide tool (Bewilogua et al, 2004). In sintered cBN materials containing binder metals, tool wear is caused mainly by the low strength of the binder metal (Luo et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Development of ultra-fine-grain binderless cBN tool for precision cutting of ferrous materials

Fujisaki

Yokota

Furushiro

et al. 2009

Journal of Materials Processing Technology

View full text Add to dashboard Cite

A new cutting tool was developed from ultra-fine-grain (<100 nm), binderless cubic boron nitride (cBN) material fabricated by transforming hexagonal boron nitride to cBN by means of sintering under an ultra-high pressure of 10 GPa at 1800 ºC. The cutting edges of the newly developed cBN tool can be made as sharp as those of single-crystal diamond tools. In this experiment, cBN and single crystal diamond tools of the same shape were compared by precision cutting tests using stainless steel specimens and steel specimens coated with an electroless Ni-P layer. The surface roughness (R z ) of specimen surfaces cut with the cBN tool by means of planing was approximately 100 nm for both the Ni-P-coated steel and stainless steel specimens. Though similar R z values were obtained for Ni-P layers cut by the cBN and diamond tools, an R z value exceeding 2000 nm was obtained for stainless steel cut by the diamond tool. High-precision surfaces with R z values of 50 -100 nm were obtained for stainless steel specimens cut with the cBN tool under high-speed milling (942 m/min) conditions. These results indicate that the newly developed cBN tool is useful for the ultra-precision or precision cutting of ferrous materials.

show abstract

Growth and characterization of thick cBN coatings on silicon and tool substrates

Cited by 23 publications

References 11 publications

Boron containing combination tool coatings—characterization and application tests

Boron containing combination tool coatings—characterization and application tests

Cutting tool performance enhancement by using a B₄C/BCN/C‐BN multilayer system

Development of ultra-fine-grain binderless cBN tool for precision cutting of ferrous materials

Contact Info

Product

Resources

About

Growth and characterization of thick cBN coatings on silicon and tool substrates

Cited by 23 publications

References 11 publications

Boron containing combination tool coatings—characterization and application tests

Boron containing combination tool coatings—characterization and application tests

Cutting tool performance enhancement by using a B4C/BCN/C‐BN multilayer system

Development of ultra-fine-grain binderless cBN tool for precision cutting of ferrous materials

Contact Info

Product

Resources

About

Cutting tool performance enhancement by using a B₄C/BCN/C‐BN multilayer system