Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies
B powders are commonly used as fuel in propellants due to their high theoretical gravimetric heat of combustion. However, the formation of viscous B2O3 layer during B combustions acts as a passivating layer that hinders the combustion efficiency. The aim of this work is to evaluate the SHS (self-...
Saved in:
Main Author: | |
---|---|
Other Authors: | |
Format: | Final Year Project |
Language: | English |
Published: |
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/10356/15334 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-15334 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-153342023-03-04T15:33:54Z Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies See Toh, Justin Wai Hong. Hng Huey Hoon School of Materials Science and Engineering DSO National Laboratories DRNTU::Engineering::Materials::Defence materials B powders are commonly used as fuel in propellants due to their high theoretical gravimetric heat of combustion. However, the formation of viscous B2O3 layer during B combustions acts as a passivating layer that hinders the combustion efficiency. The aim of this work is to evaluate the SHS (self-propagating high-temperature synthesis) reaction of B-Fe2O3 thermite and B-Fe binary system to improve the efficiency of B’s combustion. The raw materials were processed by suspension mixing and mechanical milling and studies were done by correlating powder samples’ thermal and kinetics properties with crystallographic and morphological properties. Combustion studies on reactants are made to assist in the understanding of the proposed SHS systems to boron’s combustion behavior. Mechanical milled samples were observed to undergo morphology changes which gave particle size reduction and improved homogeneity. The combustion energy harnessed for both systems falls along the predicted values. B which is predicted to be able to harnessed ~24% of the theoretical energy. B-Fe2O3 thermite system achieved up to 28% while B-Fe binary system up to 27% of this theoretical value. The addition of SHS additives helped to lower the B’s combustion onset temperature. This reduction increases with increased wt% of additives. Mechanical milled samples provide a higher reduction in the onset than suspension mixed samples. The highest combustion onset reduction was achieved by B-Fe2O3 thermite system of 34.6%. B-Fe2O3 thermite system brought about improvement in the B’s kinetics up to 4 times while B-Fe binary system by 2 times. From combustion studies, both B combustion and B-Fe2O3 thermite reactions were observed from the B-Fe2O3 thermite system while only B combustion was observed in the B-Fe binary system. Bachelor of Engineering (Materials Engineering) 2009-04-27T08:35:58Z 2009-04-27T08:35:58Z 2009 2009 Final Year Project (FYP) http://hdl.handle.net/10356/15334 en 69 p. application/pdf |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
DRNTU::Engineering::Materials::Defence materials |
spellingShingle |
DRNTU::Engineering::Materials::Defence materials See Toh, Justin Wai Hong. Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies |
description |
B powders are commonly used as fuel in propellants due to their high theoretical gravimetric heat of combustion. However, the formation of viscous B2O3 layer during B combustions acts as a passivating layer that hinders the combustion efficiency.
The aim of this work is to evaluate the SHS (self-propagating high-temperature synthesis) reaction of B-Fe2O3 thermite and B-Fe binary system to improve the efficiency of B’s combustion. The raw materials were processed by suspension mixing and mechanical milling and studies were done by correlating powder samples’ thermal and kinetics properties with crystallographic and morphological properties. Combustion studies on reactants are made to assist in the understanding of the proposed SHS systems to boron’s combustion behavior.
Mechanical milled samples were observed to undergo morphology changes which gave particle size reduction and improved homogeneity. The combustion energy harnessed for both systems falls along the predicted values. B which is predicted to be able to harnessed ~24% of the theoretical energy. B-Fe2O3 thermite system achieved up to 28% while B-Fe binary system up to 27% of this theoretical value. The addition of SHS additives helped to lower the B’s combustion onset temperature. This reduction increases with increased wt% of additives. Mechanical milled samples provide a higher reduction in the onset than suspension mixed samples. The highest combustion onset reduction was achieved by B-Fe2O3 thermite system of 34.6%. B-Fe2O3 thermite system brought about improvement in the B’s kinetics up to 4 times while B-Fe binary system by 2 times.
From combustion studies, both B combustion and B-Fe2O3 thermite reactions were observed from the B-Fe2O3 thermite system while only B combustion was observed in the B-Fe binary system. |
author2 |
Hng Huey Hoon |
author_facet |
Hng Huey Hoon See Toh, Justin Wai Hong. |
format |
Final Year Project |
author |
See Toh, Justin Wai Hong. |
author_sort |
See Toh, Justin Wai Hong. |
title |
Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies |
title_short |
Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies |
title_full |
Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies |
title_fullStr |
Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies |
title_full_unstemmed |
Processing and characterization of B-based self-sustaining high temperature (SHS) reactive materials and combustion studies |
title_sort |
processing and characterization of b-based self-sustaining high temperature (shs) reactive materials and combustion studies |
publishDate |
2009 |
url |
http://hdl.handle.net/10356/15334 |
_version_ |
1759856791299031040 |