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Innovative boron nitride-doped propellants

Defence Technology（防务技术） 2016年第2期12卷 69-80页

作者： Thelma MANNING Richard FIELD Kenneth KLINGAMAN Michael FAIR John BOLOGNINI Robin CROWNOVER Carlton P.ADAM Viral PANCHAL Eugene ROZUMOV Henry GRAU Paul MATTER Michael BEACHY Christopher HOLT Samuel SOPOK USA rmy RDECOM ARDEC Picatinny Arsenal NJ USA pH Matter LLC Columbus OH USA benet laboratory Watervliet NY USA

The U.S. military has a need for more powerful propellants with balanced/stoichiometric amounts of fuel and oxidants. However, balanced and more powerful propellants lead to accelerated gun barrel erosion and markedly shortened useful barrel life. Boron nitride(BN) is an interesting potential additive for propellants that could reduce gun wear effects in advanced propellants(US patent pending 2015-026P). Hexagonal boron nitride is a good lubricant that can provide wear resistance and lower flame temperatures for gun barrels. Further, boron can dope steel, which drastically improves its strength and wear resistance, and can block the formation of softer carbides. A scalable synthesis method for producing boron nitride nano-particles that can be readily dispersed into propellants has been developed. Even dispersion of the nano-particles in a double-base propellant has been demonstrated using a solvent-based processing approach. Stability of a composite propellant with the BN additive was verified. In this paper, results from propellant testing of boron nitride nano-composite propellants are presented, including closed bomb and wear and erosion testing. Detailed characterization of the erosion tester substrates before and after firing was obtained by electron microscopy,inductively coupled plasma and x-ray photoelectron spectroscopy. This promising boron nitride additive shows the ability to improve gun wear and erosion resistance without any destabilizing effects to the propellant. Potential applications could include less erosive propellants in propellant ammunition for large, medium and small diameter fire arms.

关键词：复合推进剂六角氮化硼硼掺杂创新型 X射线光电子能谱仪电感耦合等离子体腐蚀测试仪合成方法

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Pressure-supported Freezing Processes Above 210 MPa and Their Impact on Listeria Innocua

Pressure-supported Freezing Processes Above 210 MPa and Thei...

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国际农业工程大会

作者： Cornelius Luscher Oliver Schluter Dr.Gabriel Urrutia benet M.Sc. Dr.Jurgen Kern Prof.Dr.Dietrich Knorr

＜正＞ The phase diagram of water under pressure shows several characteristics which make it possible to optimize freezing and thawing processes of food and biomaterial. Under pressure the melting point of ordinary ice （ice I） is lowered to a minimum of -22 ℃at 210 MPa. At higher pressures other ice polymorphs with a higher density than liquid water exist which show rising melting temperature with rising pressure.

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