RAPID CARBOTHERMAL REDUCTION OF BORON-OXIDE IN A GRAPHITE TRANSPORT REACTOR

被引：48

作者：

WEIMER, AW ^{[1
]}

ROACH, RP ^{[1
]}

HANEY, CN ^{[1
]}

MOORE, WG ^{[1
]}

RAFANIELLO, W ^{[1
]}

机构：

[1] DOW CHEM CO USA,ADV CERAM LAB,MIDLAND,MI 48674

来源：

AICHE JOURNAL | 1991年 / 37卷 / 05期

关键词：

D O I：

10.1002/aic.690370513

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Uniform submicron crystals of B4C, boron-enriched boron carbide, and B4C/TiB2 composite powders have been synthesized continuously by rapid carbothermal reduction at approximately 2,200 K in a 0.14 m ID x 1.68 m long pilot-scale graphite transport reactor. A unique reactor design allowed for continuous feeding of a meltable boron oxide containing precursor, rapid heating rates that completed the carbothermal reduction reaction in seconds, and an expanded cooling that allowed for the precipitation in space of volatile excess boron oxides. Powder morphology resembled that of powder synthesized by laser pyrolysis of gaseous reactants. Rapid heating rates and minimized reaction times at high temperatures promoted nucleation with limited crystal growth. Dense parts fabricated from these powders had fine grains and extreme hardness.

引用

页码：759 / 768

页数：10

共 31 条

[1] THE SOLID SOLUTION SERIES, BORON BORON CARBIDE [J].