Diamond Materials , Inc.

Piscataway, NJ, United States

Diamond Materials , Inc.

Piscataway, NJ, United States
Time filter
Source Type

Rath P.,Karlsruhe Institute of Technology | Gruhler N.,Karlsruhe Institute of Technology | Khasminskaya S.,Karlsruhe Institute of Technology | Nebel C.,Fraunhofer Institute for Applied Solid State Physics | And 3 more authors.
Optics Express | Year: 2013

Wide bandgap dielectrics are attractive materials for the fabrication of photonic devices because they allow broadband optical operation and do not suffer from free-carrier absorption. Here we show that polycrystalline diamond thin films deposited by chemical vapor deposition provide a promising platform for the realization of large scale integrated photonic circuits. We present a full suite of photonic components required for the investigation of on-chip devices, including input grating couplers, millimeter long nanophotonic waveguides and microcavities. In microring resonators we measure loaded optical quality factors up to 11,000. Corresponding propagation loss of 5dB/mm is also confirmed by measuring transmission through long waveguides. © 2013 Optical Society of America.

Rath P.,Karlsruhe Institute of Technology | Khasminskaya S.,Karlsruhe Institute of Technology | Nebel C.,Fraunhofer Institute for Applied Solid State Physics | Wild C.,Fraunhofer Institute for Applied Solid State Physics | And 2 more authors.
Beilstein Journal of Nanotechnology | Year: 2013

Synthetic diamond films can be prepared on a waferscale by using chemical vapour deposition (CVD) on suitable substrates such as silicon or silicon dioxide. While such films find a wealth of applications in thermal management, in X-ray and terahertz window design, and in gyrotron tubes and microwave transmission lines, their use for nanoscale optical components remains largely unexplored. Here we demonstrate that CVD diamond provides a high-quality template for realizing nanophotonic integrated optical circuits. Using efficient grating coupling devices prepared from partially etched diamond thin films, we investigate millimetre-sized optical circuits and achieve single-mode waveguiding at telecoms wavelengths. Our results pave the way towards broadband optical applications for sensing in harsh environments and visible photonic devices. © 2013 Rath et al; licensee Beilstein-Institut.

Kear B.H.,Rutgers University | Al-Sharab J.F.,Rutgers University | Sadangi R.K.,Rutgers University | Deutsch S.,Rutgers University | And 5 more authors.
Journal of the American Ceramic Society | Year: 2011

A reversible phase transformation (RPT) process is observed that converts fully dense polycrystalline Y 2O 3 directly into the nanocrystalline state. The process involves a forward transformation from cubic-to-monoclinic symmetry under a high pressure and a reverse transformation from monoclinic-to-cubic symmetry under a lower pressure. An example is given of a reduction in grain size of cubic-Y 2O 3 from 300 to 0.1 μm in a single pressure-induced RPT at 1000°C. © 2011 The American Ceramic Society.

Voronov O.A.,Diamond Materials , Inc. | Kear B.H.,Rutgers University
Transactions - Geothermal Resources Council | Year: 2011

The efficiency of drilling and pumping can be improved by substituting Titanium Carbide/Titanium (TiC/Ti) composites for Tungsten Carbide/Cobalt (WC/Co) composites, for the following reasons. First, since TiC is harder than WC, TiC/Ti composites offer significant improvements in cutting performance. Second, oxidation and hot corrosion resistance of TiC/Ti composites are better than their WC/Co counterparts. Thus, corrosive-wear resistance of drill bits and sliding bearing components may be improved. Third, the cost of replacing WC/Co components with TiC/Ti components should be relatively low, since TiC and Ti powders are readily available in the US. A pressure-assistant sintering (PAS) method has been developed to fabricate hard particle-dispersed composites. In a serried of PAS tests, various mixtures of TiC and Ti powders were consolidated at 0.2-2.0 GPa/600-1200°C. The properties of TiC/Ti samples were investigated and compared with that of other materials, industrial composites and alloys.

Gilley K.L.,University of Florida | Nino J.C.,University of Florida | Riddle Y.W.,Diamond Materials , Inc. | Hahn D.W.,University of Florida | Perry S.S.,University of Florida
ACS Applied Materials and Interfaces | Year: 2012

The effects of annealing temperature on the tribological properties of electroless nickel-boron coatings have been investigated. The coatings were annealed in a tube furnace under a flow (0.0094 N m 3/min) of oxygen gas at temperatures of 250, 400, 550, and 700 °C for 3 h. Using scanning electron microscopy, images of the annealed coatings documented changes in surface morphology. From this it was seen that the higher annealing temperatures produced marked changes, moving from the nodular structure of nickel-boron coatings to a flaked surface morphology. The chemical effect of the annealing temperature was studied via X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The XPS data indicated that after annealing at the temperatures of 550 and 700 °C, an accumulation of boron oxide species could be seen at the surface as well as a complete loss of nickel signal. An analysis of Raman spectra collected across the surface further identified the predominant species to be boric acid. The tribological response of the coatings was studied with a pin-on-disk tribometer with 440C stainless steel balls run against the coatings in ambient air. It was seen that the as received sample and the sample annealed at 250 °C samples exhibited modest friction properties, while the 400 °C sample had increased friction due to wear debris from the ball. The 550 and 700 °C samples showed remarkably low friction coefficients between 0.06 and 0.08, attributable to the presence of boric acid. The wear tracks were analyzed using scanning white light interferometry and from this data wear rates were obtained for the coatings ranging from 10 -8 to 10 -7 mm 3/Nm. © 2012 American Chemical Society.

Deutsch S.,Rutgers University | Al-Sharab J.F.,Rutgers University | Kear B.H.,Rutgers University | Tse S.D.,Rutgers University | And 2 more authors.
Scripta Materialia | Year: 2013

A pressure-induced directional crystallization process is described to convert equiaxially-grained cubic Y2O3 into columnar-grained monoclinic Y2O3. The conversion to the columnar-grained structure initiates at the sample surface, propagates into the sample interior and eventually encompasses the entire sample volume. Optimal processing conditions are about 3.0 GPa at 1000 C. It is proposed that the phase transformation from cubic Y2O3 to the higher density monoclinic Y2O3 provides the driving force for columnar grain growth. © 2013 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

Deutsch S.,Rutgers University | Al-Sharab J.F.,Rutgers University | Kear B.H.,Rutgers University | Tse S.D.,Rutgers University | And 2 more authors.
Materials Science and Engineering A | Year: 2014

Interactions between polycrystalline yttria (Y2O3) and graphitic carbon during high-pressure high-temperature processing can take two main forms: (i) major carbon ingress into fractured grain boundaries of Y2O3 by an infiltration mechanism, and (ii) minor carbon ingress into intact grain boundaries of Y2O3 by a diffusion mechanism. In the latter case, when grain coarsening occurs, excess carbon particles form at grain boundaries, since there is little or no solubility of carbon in the Y2O3 grains themselves, irrespective of crystal structure. Segregation of carbon to grain boundaries can reduce grain-boundary strength. For example, high-purity fine-grained Y2O3, which is originally characterized by transgranular fracture, displays intergranular fracture after carbon ingress into it. © 2014 Elsevier B.V.

Diamond Materials , Inc. | Date: 2011-11-28

Cutting machines; Diamond-pointed metal-cutting tools; Industrial machinery, namely, electromechanical marking machines; Laminating machines for industrial use; Machine coupling and transmission components, except for land vehicles, and parts therefor; Machine tools, namely, powered machines for cutting or shaping or finishing metals or other materials; Machines and machine tools for the cutting and forming of materials; Machines for cleaning surfaces using high pressure water; Motors, gears and drives for orientating solar panels; Packing machines; Pressure washing machines; Semiconductor wafer processing machines; Vacuum packing machines.

Voronov O.A.,Diamond Materials , Inc. | Street Jr. K.W.,NASA
Diamond and Related Materials | Year: 2010

Samples of a new carbon material, Diamonite-B, were fabricated under high pressure from a commercial carbon black - identified as mixed fullerenes. The new material is neither graphite-like nor diamond-like, but exhibits electrical properties close to graphite and mechanical properties close to diamond. The use of Raman spectroscopy to investigate the vibrational dynamics of this new carbon material and to provide structural characterization of its short-, medium- and long-range order is reported. We also provide the results of investigations of these samples by high resolution electron microscopy and X-ray diffraction. Hardness, electrical conductivity, thermal conductivity and other properties of this new material are compared with synthetic graphite-like and diamond-like materials, two other phases of synthetic bulk carbon. © 2009 Elsevier B.V.

Loading Diamond Materials , Inc. collaborators
Loading Diamond Materials , Inc. collaborators