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Processing of boron carbide.

Cho, Namtae.

Processing of boron carbide.

紀錄類型:	書目-電子資源 : 單行本
正題名/作者:	Processing of boron carbide./
作者:	Cho, Namtae.
面頁冊數:	89 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5336.
Contained By:	Dissertation Abstracts International67-09B.
標題:	Engineering, Materials Science. -
電子資源:	Download PDF (下載PDF全文)
ISBN:	9780542861178

Processing of boron carbide.
Cho, Namtae.

Processing of boron carbide. - 89 p.

Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5336.

Thesis (Ph.D.)--Georgia Institute of Technology, 2006.

The processing of boron carbide powder including sintering optimization, green body optimization and sintering behavior of nano-sized boron carbide was investigated for the development of complex shaped body armor.

ISBN: 9780542861178Subjects--Topical Terms:

1000005553
Engineering, Materials Science.

Processing of boron carbide.
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500 $a Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5336.
500 $a Adviser: Robert Speyer.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2006.
520 $a The processing of boron carbide powder including sintering optimization, green body optimization and sintering behavior of nano-sized boron carbide was investigated for the development of complex shaped body armor.
520 $a Pressureless sintered B4C relative densities as high as 96.7% were obtained by optimizing the soak temperature, and holding at that temperature for the minimum time required to reach terminal density. Although the relative densities of pressureless sintered specimens were lower than that of commercially produced hot-pressed B4C, their (Vickers) hardness values were comparable. For 4.45 cm dia. 1.35 cm height disk-shaped specimens, pressureless sintered to at least 93.0% relative density, post-hot isostatic pressing resulted in vast increases in relative densities (e.g. 100.0%) and hardness values significantly greater than that of commercially produced hot-pressed B 4C.
520 $a The densification behavior of 20-40nm graphite-coated B4C nano-particles was studied using dilatometry, x-ray diffraction and electron microscopy. The higher than expected sintering onset from a nano-scale powder (&sim;1500°C) was caused by remnant B2O3 not removed by methanol washing, keeping particles separated until volatilization, and the carbon coatings, which imposed particle to particle contact of a substance more refractory than B4C. Solid state sintering (1500-1850°C) was followed by an arrest in contraction attributed to formation of eutectic liquid droplets of size more than 10X the original nano-particles. These droplets, induced to form well below known B4C-graphite eutectic temperatures by the high surface energy of nanoparticles, are interpreted to have quickly solidified to form a vast number of voids in particle packing, which in turn, impeded continued solid state sintering. Starting at 2200°C, a permanent liquid phase formed which facilitated a rapid measured contraction by liquid phase sintering and/or compact slumping.
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