Low-cost preparation of boron nitride ceramic powders

2012 ◽  
Vol 27 (3) ◽  
pp. 534-537 ◽  
Author(s):  
Duan Li ◽  
Changrui Zhang ◽  
Bin Li ◽  
Feng Cao ◽  
Siqing Wang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Low Cost ◽  
Ceramic Powders

Preparation of High-Performance Continuous Boron Nitride Fibers from Boracic Acid

2014 ◽  
Vol 602-603 ◽  
pp. 151-154 ◽  
Author(s):  
Chuan Shan Li ◽  
Ru Li ◽  
Xiao Yong Du ◽  
Ming Xia Zhang ◽  
Jie Tang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Inert Atmosphere ◽  
Fiber Reinforced Composites ◽  
Boric Oxide ◽  
Mechanical Function ◽  
Reinforced Composites ◽  
Conventional Manner

Continuous multi-filament boron nitride fibers have been prepared on a large scale using the melt drawn technique from a low-cost boracic acid. Boracic acid was heated to obtain the molten boric oxide in a melting tank. Molten boric oxide was melt spun in a conventional manner through an 200-tip bushing to produce a continuous multifilament yarn consisting of 200 filaments of boric oxide. Boric oxide fibers were nitrided in an ammonia and were annealed in an inert atmosphere while simultaneously subjecting the fibers to sufficient longitudinal tension as to at least prevent longitudinal shrinkage of the fibers. The resulting fibers, consisting essentially of boron nitride, were less than about 8 μm in diameter and greater than 500 m in length. It indicated that the boron nitride fibers has a sound mechanical function with tensile strength of 1.40 GPa. The continuous boron nitride fibers of high-performance were especially suitable for reinforcing plastic, ceramic or metal matrices in the preparation of fiber reinforced composites.

A simple, low cost, and template-free method for synthesis of boron nitride using different precursors

2020 ◽  
Author(s):  
Majid Mirzaee ◽  
Alimorad Rashidi ◽  
Ashkan Zolriasatein ◽  
Majid Rezaei Abadchi
Keyword(s):  
Boron Nitride ◽  
Low Cost ◽  
Template Free

High Quality Ceramic Coatings Sprayed by High Efficiency Hypersonic Plasma Spraying Gun

2005 ◽  
Vol 475-479 ◽  
pp. 3981-3984 ◽  
Author(s):  
Sheng Zhu ◽  
Bin Shi Xu ◽  
Jiu Kun Yao
Keyword(s):  
Plasma Spraying ◽  
Ceramic Coating ◽  
High Efficiency ◽  
Low Cost ◽  
Ceramic Coatings ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Ceramic Powders ◽  
Tio2 Ceramic ◽  
Spraying Process

This paper introduced the structure of the high efficiency hypersonic plasma spraying gun and the effects of hypersonic plasma jet on the sprayed particles. The optimised spraying process parameters for several ceramic powders such as Al2O3, Cr2O3, ZrO2, Cr3C2 and Co-WC were listed. The properties and microstructure of the sprayed ceramic coatings were investigated. Nano Al2O3-TiO2 ceramic coating sprayed by using the high efficiency hypersonic plasma spraying was also studied. Compared with the conventional air plasma spraying, high efficiency hypersonic plasma spraying improves greatly the ceramic coatings quality but at low cost.

Single nickel atom supported on hybridized graphene–boron nitride nanosheet as a highly active bi-functional electrocatalyst for hydrogen and oxygen evolution reactions

2019 ◽  
Vol 7 (46) ◽  
pp. 26261-26265 ◽  
Author(s):  
Shaobin Tang ◽  
Xunhui Zhou ◽  
Tianyong Liu ◽  
Shiyong Zhang ◽  
Tongtong Yang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Oxygen Evolution ◽  
Low Cost ◽  
Nickel Atom ◽  
Highly Active ◽  
Boron Nitride Nanosheet

Hybridized graphene–boron nitride nanosheet supported single nickel atom was designed as a highly active, stable, and low-cost bi-functional OER/HER electrocatalyst.

From Earth Minerals to Nitrides

2007 ◽  
Vol 554 ◽  
pp. 151-156
Author(s):  
N. Karakus ◽  
A.O. Kurt ◽  
O. Toplan
Keyword(s):  
Low Cost ◽  
Raw Material ◽  
Ceramic Powders ◽  
Yield And Quality ◽  
Carbothermal Synthesis ◽  
High Transformation ◽  
Transformation Potential ◽  
Experimental Works ◽  
Powdered Form

Structural ceramic parts such as those made from Si3N4 or SiAlONs are promising for considering them in replacing metals in the areas where harsh environmental conditions like abrasive corrosion under high stresses along with high temperature effects are dominant. A widespread use of these ceramics depends on the ease of finding them with low cost. This paper highlights some important points on the low cost production technique of Si3N4 or SiAlON ceramics in powdered form via carbothermal synthesis technique using minerals in the light of the current and previous works. The technique gives flexibility of controlling production parameters that affect on the yield and quality of powders produced. A special account is given to the effects of reactants on the production of such ceramic powders. After synthesising ceramics in powdered form, some comparisons were made on the characterisation of the products of homemade ones with that of commercially available ones. After successful experimental works, a raw material of orthoclase clay mineral exhibited a high transformation potential to a mixture of Si3N4 and SiAlON type ceramic powders.

scholarly journals Bandgap-Tuned 2D Boron Nitride/Tungsten Nitride Nanocomposites for Development of High-Performance Deep Ultraviolet Selective Photodetectors

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1433
Author(s):  
Ali Aldalbahi ◽  
Rafael Velázquez ◽  
Andrew F. Zhou ◽  
Mostafizur Rahaman ◽  
Peter X. Feng
Keyword(s):  
Boron Nitride ◽  
High Performance ◽  
Operating Temperature ◽  
Low Cost ◽  
Fast Response ◽  
Tungsten Nitride ◽  
Applied Bias Voltage ◽  
New Device ◽  
Tunable Bandgap ◽  
Deep Ultraviolet

This study presents a fast and effective method to synthesize 2D boron nitride/tungsten nitride (BN–WN) nanocomposites for tunable bandgap structures and devices. A few minutes of synthesis yielded a large quantity of high-quality 2D nanocomposites, with which a simple, low-cost deep UV photo-detector (DUV-PD) was fabricated and tested. The new device was demonstrated to have very good performance. High responsivity up to 1.17 A/W, fast response-time of lower than two milliseconds and highly stable repeatability were obtained. Furthermore, the influences of operating temperature and applied bias voltage on the properties of DUV-PD as well as its band structure shift were investigated.

scholarly journals Enhanced Thermal Conductivity of Silicone Composites Filled with Few-Layered Hexagonal Boron Nitride

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2072
Author(s):  
Wei-Cheng Cheng ◽  
Yi-Ting Hsieh ◽  
Wei-Ren Liu
Keyword(s):  
Thermal Conductivity ◽  
Boron Nitride ◽  
Heat Dissipation ◽  
Hexagonal Boron Nitride ◽  
Low Cost ◽  
Laser Flash ◽  
Force Microscopy ◽  
Surface Areas ◽  
Laser Flash Analysis ◽  
Surface Morphologies

In this study, we demonstrate the use of silicone/few-layered hexagonal boron nitride (FL-hBN) composites for heat dissipation applications. FL-hBN is synthesized via a green, facile, low-cost and scalable liquid exfoliation method using a jet cavitation process. The crystal structures, surface morphologies and specific surface areas of pristine h-BN and FL-hBN were characterized by XRD, SEM, TEM and AFM (atomic force microscopy). The results confirmed that FL-hBN with a thickness of ~4 nm was successfully obtained from the exfoliation process. In addition, we introduced both pristine h-BN and FL-hBN into silicone with different ratios to study their thermal properties. The results of the laser flash analysis indicate that the silicon/FL-hBN composite exhibited a higher thermal conductivity than that of the silicone/h-BN composite. With the optimal loading content of 30 wt.% FL-hBN content, the thermal conductivity of the composite could be enhanced to 230%, which is higher than that of silicone/h-BN (189%). These results indicate that jet cavitation is an effective and swift way to obtain few-layered hexagonal boron nitride that could effectively enhance the thermal conductivity of silicone composites.

Magnesium-induced preparation of boron nitride nanotubes and their application in thermal interface materials

Nanoscale ◽  
2019 ◽  
Vol 11 (24) ◽  
pp. 11457-11463 ◽  
Author(s):  
Chaowei Li ◽  
Xiaoyang Long ◽  
Songfeng E ◽  
Qichong Zhang ◽  
Taotao Li ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Low Cost ◽  
Boron Nitride Nanotubes ◽  
Thermal Interface Materials ◽  
Thermal Interface ◽  
Induction Strategy ◽  
Interface Materials

The Mg induction strategy is low cost and efficiently generates BNNTs, which can be widely used in thermal interface materials.

Comparative Study of SOFC’s Fabricated With Conventional and Reaction-Sintered 8YSZ Powders

2008 ◽  
Author(s):  
Daniel Storjohann ◽  
Sophie Menzer ◽  
James Daggett ◽  
Neal Sullivan ◽  
Dustin Beeaff
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Performance Metrics ◽  
Powder Processing ◽  
Low Cost ◽  
Yttria Stabilized Zirconia ◽  
Ceramic Powders ◽  
Stabilized Zirconia ◽  
Fuel Conversion ◽  
Sintered Powder

“Reaction-sintered” powder processing is a new method for low-cost production of yttria-stabilized zirconia (YSZ). Developed by CoorsTek, Inc., reaction-sintered 8YSZ powders may prove to be a low-cost alternative to conventional ceramic powders used in solid oxide fuel cells (SOFC’s). However, the performance of fuel cells fabricated using reaction-sintered 8YSZ powders needs to be quantitatively compared to the conventional 8YSZ powders. In this study, we present results of such a comparison by evaluating both planar anode supports and tubular SOFC’s fabricated using reaction-sintered and conventional 8YSZ powders. Comparisons between material sets were conducted to compare cell morphology and composition, in addition to a number of different SOFC-performance metrics, including gas transport, fuel-conversion and power density. Experimental results show that the performance of SOFCs fabricated using reaction-sintered 8YSZ is comparable to cells fabricated with conventional 8YSZ powders.

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