Making hardmetal even harder with dispersed CBN

Brookes, Ken

doi:10.1016/s0026-0657(07)70124-8

Cited by 19 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The SiO 2 content was examined using an inductively coupled plasma‐optical emission spectrometer (IRIS Advantage Duo; Thermo Fisher Scientific, Waltham, MA). The densities of the specimens were measured using the Archimedes method and the relative densities were calculated using the theoretical densities of Al 2 O 3 (3.99 g/cm 3 ), cBN (3.49 g/cm 3 ), and SiO 2 (2.20 g/cm 3 ) . The Vickers hardness ( H v ) and fracture toughness ( K IC ) at room temperature were measured using a Vickers microhardness tester at loads of 0.98 and 9.8 N, respectively.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of CVD‐Deposited SiO₂ as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Zhang

Goto

2012

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

A SiO2 nanolayer, 1.0–2.8 mass% in content, was coated on cubic boron nitride (cBN) powder by rotary chemical vapor deposition (RCVD). The morphology of the SiO2 nanolayer changed from isolated islands to a continuous layer with increasing supply rate of the precursor, tetraethyl orthosilicate. The effect of the SiO2 coating on the sinterability and mechanical properties of cBN for machine‐tool applications was evaluated. The SiO2‐coated cBN (cBN/SiO2) powder was mixed with Al2O3 and consolidated by spark plasma sintering (SPS) at 1473–1873 K. The phase transformation temperature of cBN to hexagonal BN (hBN) in Al2O3–cBN/SiO2 was 1773 K, 100 K higher than that in Al2O3–cBN composites. The highest density of the Al2O3–cBN/SiO2 composites was 99.5% at 30 vol% cBN/SiO2 content, at which the microhardness and fracture toughness were 28 GPa and 4.1 MPa·m1/2, respectively. This indicates that RCVD‐deposited SiO2 is a promising sintering aid for cBN and Al2O3–cBN/SiO2 sintered bodies produced by SPS may be applicable as cutting tools.

show abstract

Section: Methodsmentioning

confidence: 99%

Evaluation of CVD‐Deposited SiO₂ as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Zhang

Goto

2012

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

show abstract

“…Esses resultados podem ser atribuídos as fases cerâmicas de alta dureza utilizadas como ligante. A maior dureza alcançada é similar a dos resultados encontrados para os sistemas cBN-Al em HPHT [8,9,12,14,16,18,23]…”

Section: A Importância Do Al Na Sinterização Do Cbnunclassified

“…Sinterização em baixas pressões (SPS) O cBN é conhecido pela sua baixa sinterabilidade, provocada por fortes ligações covalentes e baixo coeficiente de difusão entre o boro e o nitrogênio [23,24]. Neste sentido, a sinterização utilizando pressão ultra-alto (acima de 5GPa) e diferentes tipos de aditivos foi a primeira alternativa encontrada para obter elevada densificação de cBN.…”

Section: Figura 4: Microestrutura Do Compósito Cbn-ticunclassified

Processamento, Características E Propriedades Do Nitreto Cúbico De Boro – Uma Revisão Atualizada

Silva¹,

Picanço²,

Skury³

et al. 2017

Anais Do Congresso Anual Da ABM

View full text Add to dashboard Cite

Resumo Apresenta-se uma revisão das características e propriedades do nitreto cúbico de boro (cBN) bem como de diferentes tipos de processamento. A influência da adição de ligantes e a formação de compósitos com outras cerâmicas são também revistas. Finalmente, destaca-se a grande importância prática do cBN como cerâmica de elevada dureza na substituição do diamante em ferramentas de corte. Palavras-chave: Nitreto cúbico de boro, cBN, sinterização, dureza, aplicações. PROCESSING, CHARACTERISTICS AND PROPERTIES OF CUBIC BORON NITRIDE-A UPDATED REVIEW Abstract A review of the characteristics and properties of cubic boron nitride (cBN) is presented, including different processing methods. The influence of bonding substances as well as other ceramic composites is also reviewed. Finally, it is highlighted the great practical importance of the cBN as a ceramic with elevated hardness in substitution for diamond in cutting tools.

show abstract

“…Common bulk materials for cutting tools are cemented carbides [5] and polycrystalline cubic boron nitride (PCBN) [6]. As cemented tungsten carbide (WC--Co) was the substrate of choice in Paper 1 and 2, it will briefly be described here.…”

Section: Bulk Materialsmentioning

confidence: 99%

Atom Probe Tomography of TiSiN Thin Films

Engberg¹

2015

View full text Add to dashboard Cite

This thesis concerns the wear resistant coating TiSiN and the development of the analysis technique atom probe tomography (APT) applied to this materials system. The technique delivers compositional information through time--of--flight mass spectrometry, with sub--nanometer precision in 3D for a small volume of the sample. It is thus a powerful technique for imaging the local distribution of elements in micro and nanostructures. To gain the full benefits of the technique for the materials system in question, I have developed a method that combines APT with isotopic substitution, here demonstrated by substitution of nat N with 15 N. This alters the time--of--flight of ions with of one or more N and will thereby enable the differentiation of the otherwise inseparable isotopes 14 N and 28 Si. Signs of small--scale fluctuations in the data led the development of an algorithm needed to properly visualize these fluctuations. A method to identify the best sampling parameter for visualization of small--scale compositional fluctuations was added to an algorithm originally designed to find the best sampling parameters for measuring and visualizing strong compositional variations. With the identified sampling parameters, the nano--scale compositional fluctuations of Si in the metal/metalloid sub--lattice could be visualized. The existence and size of these fluctuations were corroborated by radial distribution functions, a technique independent of the previously determined sampling parameter. The radial distribution function algorithm was also developed further to ease in the interpretation. The number of curves could thereby be reduced by showing elements, rather than single and molecular ions (of which there were several different kinds). The improvement of the algorithm also allowed interpretation of signs regarding the stoichiometry of SiNy. With a combination of analytical transmission electron microscopy and APT we show Si segregation on the nanometer scale in arc--deposited Ti0.92Si0.08 15 N and Ti0.81Si0.19 15 N thin films. APT composition maps and proximity histograms generated from Ti--rich domains show that the TiN contain at least ~2 at. % Si for Ti0.92Si0.08N and ~5 at. % Si for Ti0.81Si0.19N, thus confirming the formation of solid solutions. The formation of relatively pure SiNy domains in the Ti0.81Si0.19N films is tied to pockets between microstructured, columnar features in the film. Finer SiNy enrichments seen in APT possibly correspond to tissue layers around TiN crystallites, thus effectively hindering growth of TiN crystallites, causing TiN renucleation and thus explaining the featherlike nanostructure within the columns of these films. IVV

show abstract

Making hardmetal even harder with dispersed CBN

Cited by 19 publications

References 0 publications

Evaluation of CVD‐Deposited SiO₂ as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Evaluation of CVD‐Deposited SiO₂ as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Processamento, Características E Propriedades Do Nitreto Cúbico De Boro – Uma Revisão Atualizada

Atom Probe Tomography of TiSiN Thin Films

Contact Info

Product

Resources

About

Making hardmetal even harder with dispersed CBN

Cited by 19 publications

References 0 publications

Evaluation of CVD‐Deposited SiO2 as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Evaluation of CVD‐Deposited SiO2 as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Processamento, Características E Propriedades Do Nitreto Cúbico De Boro – Uma Revisão Atualizada

Atom Probe Tomography of TiSiN Thin Films

Contact Info

Product

Resources

About

Evaluation of CVD‐Deposited SiO₂ as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering

Evaluation of CVD‐Deposited SiO₂ as a Sintering Aid for Cubic Boron Nitride Consolidated with Alumina by Spark Plasma Sintering