公开(公告)号：US20200270757A1

公开(公告)日：2020-08-27

申请号：US16285370

申请日：2019-02-26

Applicant: King Fahd University of Petroleum and Minerals

Inventor： Muhammad Ali EHSAN ,  Md. Abdul AZIZ ,  Abbas Saeed HAKEEM

IPC: C25B11/04 ,  C25B1/04 ,  B01J35/00 ,  B01J23/75 ,  B01J37/02

Abstract: A synthetic methodology for robust, nanostructured films of cobalt oxide over metal evaporated gold or similar material layer of, e.g., 50 nm, directly onto glass or other substrates via aerosol assisted chemical vapor deposition (AACVD). This approach allows film growth rates in the range of, e.g., 0.8 nm/s, using a commercially available precursor, which is ˜10-fold the rate of electrochemical synthetic routes. Thus, 250 nm thick cobalt oxide films may be generated in only 5 minutes of deposition time. The water oxidation reaction for such films may start at ˜0.6 V vs Ag/AgCl with current density of 10 mA/cm2 and is achieved at ˜0.75 V corresponding to an overpotential of 484 mV. This current density is further increased to 60 mA/cm2 at ˜1.5 V (vs Ag/AgCl). Electrochemically active surface area (ECSA) calculations indicate that the synergy between a Au-film, acting as electron sink, and the cobalt oxide film(s), acting as catalytic layer(s), are more pronounced than the surface area effects.

公开(公告)号：US20190330116A1

公开(公告)日：2019-10-31

申请号：US16507117

申请日：2019-07-10

Applicant: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

Inventor： Abbas Saeed HAKEEM ,  Tahar LAOUI ,  Hafiz Muzammil IRSHAD ,  Bilal Anjum AHMED ,  Muhammad Ali EHSAN

IPC: C04B35/117 ,  C04B35/103 ,  C04B35/628 ,  C22C29/12 ,  C04B35/64

Abstract: Conventional sintering processes convert a portion of cBN to hBN which is softer than cBN which negatively affects functional properties of an alumina composite. The invention is directed to method for making an alumina-cubic boron nitride (Al2O3-cBN) composite that contains substantially no hexagonal boron nitride (hBN) by non-conventional spark plasma sintering of cBN with nano-sized alumina particles. The invention is also directed to Al2O3-cBN/Ni composites, which contain substantially no hBN, and which exhibit superior physical and mechanical properties compared to alumina composites containing higher amounts of hBN.

公开(公告)号：US20190119166A1

公开(公告)日：2019-04-25

申请号：US15788914

申请日：2017-10-20

Applicant: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

Inventor： Abbas Saeed HAKEEM ,  Tahar LAOUI ,  Hafiz Muzammil IRSHAD ,  Bilal Anjum AHMED ,  Muhammad Ali EHSAN

IPC: C04B35/117 ,  C04B35/103 ,  C04B35/64 ,  C04B35/628

CPC classification number: C04B35/117 ,  C04B35/103 ,  C04B35/62842 ,  C04B35/64 ,  C04B2235/3217 ,  C04B2235/386 ,  C04B2235/405 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/5454 ,  C04B2235/6562 ,  C04B2235/666 ,  C04B2235/96 ,  C04B2235/9607 ,  C22C29/12 ,  C22C2026/003

Abstract: Conventional sintering processes convert a portion of cBN to hBN which is softer than cBN which negatively affects functional properties of an alumina composite. The invention is directed to method for making an alumina-cubic boron nitride (Al2O3-cBN) composite that contains substantially no hexagonal boron nitride (hBN) by non-conventional spark plasma sintering of cBN with nano-sized alumina particles. The invention is also directed to Al2O3-cBN/Ni composites, which contain substantially no hBN, and which exhibit superior physical and mechanical properties compared to alumina composites containing higher amounts of hBN.

公开(公告)号：US20170267590A1

公开(公告)日：2017-09-21

申请号：US15610770

申请日：2017-06-01

Applicant: KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

Inventor： Abbas Saeed HAKEEM ,  Tahar Laoul ,  Moath Mohammad Almaliki ,  Awais Muhammad Raja Khan ,  Faheemuddin Patel

IPC: C04B35/597 ,  C04B35/64

CPC classification number: C04B35/597 ,  C04B35/64 ,  C04B35/645 ,  C04B2235/3208 ,  C04B2235/3869 ,  C04B2235/3878 ,  C04B2235/402 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/5454 ,  C04B2235/6562 ,  C04B2235/666 ,  C04B2235/766 ,  C04B2235/767 ,  C04B2235/78 ,  C04B2235/788 ,  C04B2235/80

Abstract: A Ca—SiAlON ceramic with enhanced mechanical properties and a method employing micron-sized and submicron precursors to form the Ca—SiAlON ceramic. The Ca—SiAlON ceramic comprises not more than 42 wt % silicon, relative to the total weight of the Ca—SiAlON ceramic. The method employs submicron particles and also allows for substituting a portion of aluminum nitride with aluminum to form the Ca—SiAlON ceramic with enhanced mechanical properties.