CN1037427C - 激光气相合成氮化铁超细粉的方法 - Google Patents
激光气相合成氮化铁超细粉的方法 Download PDFInfo
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- CN1037427C CN1037427C CN94112440A CN94112440A CN1037427C CN 1037427 C CN1037427 C CN 1037427C CN 94112440 A CN94112440 A CN 94112440A CN 94112440 A CN94112440 A CN 94112440A CN 1037427 C CN1037427 C CN 1037427C
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- 239000000843 powder Substances 0.000 title claims abstract description 14
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 title abstract description 3
- 150000004767 nitrides Chemical class 0.000 title abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 11
- 239000012495 reaction gas Substances 0.000 claims abstract description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052786 argon Inorganic materials 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 3
- 229910001337 iron nitride Inorganic materials 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 230000002194 synthesizing effect Effects 0.000 claims description 3
- 239000012300 argon atmosphere Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 18
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 229910000727 Fe4N Inorganic materials 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910002588 FeOOH Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910017147 Fe(CO)5 Inorganic materials 0.000 description 1
- 229910000705 Fe2N Inorganic materials 0.000 description 1
- 229910015183 FeNx Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Abstract
一种激光气相合成氮化铁超细粉的方法,其特征在于:以Fe(CO)5为铁源,以NH3为反应气,反应气通过加热的铁源,加热温度30~70℃,进入连续二氧化碳激光气相反应器,在氩气或氮气氛下激光气相合成反应方程式为:
工艺参数为:激光功率密度:1000~10000W/cm2,反应压力:10000~100000Pa,NH:流量:70~300ml/min。本发明产品粒度细小均匀,杂质少,且工艺简单。
Description
本发明涉及氮化铁超细粉的制备,特别提供了一种用激光气相合成的办法生产氮化铁超细粉的技术。
氮化铁微粉是近年来出现的新的磁记录材料和催化剂材料,由于其优良的磁记录特性(即高矫顽力和饱和磁化强度及高声噪比和防氧化特性),而成为声像记录及通讯领域引入注目的新材料。目前制备氮化铁(Fe4N)微粉的方法主要有以下二种:1)蒸发—冷凝法:在NH3-H2气氛中蒸发铁固体,形成的铁蒸气和[N]在高温区反应,生成Fe4N和少量的γ-Fe和α-Fe。此法成本高,粒子均匀性差,易出现杆状等不规则微粒,γ-Fe和α-Fe微粒不易去除,从而影响了粉体的性能:2)铁微粒氮化法:用FeOOH或α-Fe微粒在NH3-H2气氛中加热保温几个至几十个小时,使之形成氮化铁微粉,此法生产周期长,工艺复杂,但可以获得针状微粒(粒径>200nm),磁性能优良,但是用此法不能一步结合成,首先需制α-Fe和α-FeOOH微粒。
本发明的目的在于提供一种粒度细小均匀,杂质少,且工艺简单的氮化铁微粒制备技术。
本发明提供了一种激光气相合成氮化铁超细粉的方法,其特征在于:
——以Fe(CO)5为铁源;
——以NH3为反应气;
——反应气通过加热的铁源,加热温度30~70℃
进入连续二氧化碳激光气相反应器,在氩气或氮气氛下激光气相合成反应方程式为: (3)工艺参数为:激光功率密度: 1000~10000W/cm2
反应压力:10000~100000Pa
NH3流重:70~300ml/min。
本发明采用连续二氧化碳激光源诱发NH3和Fe(CO)5的气相热分解反应,一步合成氮化铁纳米微粉,其原理如下:NH3吸收激光束的能量,并把一部分吸收的光能传给Fe(CO)5分子,使得NH3和Fe(CO)5同时分解,然后化合形成FeNx。用此法合成的氮化铁微粉,气体流速、流量可控,反应压力、温度可调,从而可制备出成分不同的多相氮化铁物相,如γ′-Fe4N、Fe2N、Fe3N纳米微粒,氮化铁微粒中即可以是其中的一种单相,也可是上述几种的混合物。该种超细氮化铁微粒具有细小(10~40nm),分布均匀,纯度高,颗粒圆整,易分散等特点,微粒连接成链状,具有优良的磁性能,适合做磁记录材料。下面详述本发明。
附图1为反应装置示意图;
附图2为氮化铁粉的形貌。
实施例1
所用反应装置见图1,铁源Fe(CO)5放在一罐(1)中,反应气氨通过罐(1),带走铁源并进入到反应室(2)中,激光束会集于反应气流处,反应气流正下方对应于一收集管(3),收集管通过一过滤器(4)与真空泵相连,与激光束入口镜片(5)相对的为激光吸收片(6),该片(5)近旁为保护气入口,可通入氩气或氮气以保护镜片。
反应器的固定参数为:喷嘴直径3mm,聚焦点在喷咀正下方3.5mm处,光斑直径5mm。
铁源Fe(CO)5被加热到30℃,激光功率500W,功率密度2547W/cm2,反应压力50000Pa,氨气NH3流量300ml/min。合成粉未为γ′-Fe4N,粒径在20~30nm,磁性测试为Hc=600Oe,σs=120emu/g,形貌见图2。
实施例2
固定参数同实例1,激光功率为300W,功率密度1528W/cm2,Fe(CO)5温度为50℃,NH3流量200ml/min,反应室压力20000Pa,合成的氮化铁的粒径在20~40nm,含有少量α-Fe的Fe4N微粒,产率25g/h。
实施例3
固定参数同实例1,Fe(CO)5温度70℃,反应室压力70000Pa,激光功率800W,功率密度4071W/cm2,NH3流量200ml/min,合成含Fe4N和Fe3N的复合氮化铁粉,粒子直径在20~30nm,产率40g/h。
Claims (1)
1.一种激光气相合成氮化铁超细粉的方法,其特征在于:
——以Fe(CO)5为铁源;
——以NH3为反应气;
——反应气通过加热的铁源,加热温度30~70℃,进入连续二氧化碳激光气相反应器,在氩气或氮气氛下激光气相合成反应方程式为: (3)工艺参数为:激光功率密度: 1000~10000W/cm2
反应压力:10000~100000Pa
NH3流量:70~300ml/min。
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CN1090992C (zh) * | 1998-03-10 | 2002-09-18 | 中国科学院金属研究所 | 一种激光气相合成纳米粉反应装置 |
CN101607701B (zh) * | 2009-07-24 | 2011-01-05 | 东北大学 | 纳米化、强磁场双促进法制备氮化铁材料的方法及装置 |
CN101891163A (zh) * | 2010-07-07 | 2010-11-24 | 北京科技大学 | 一种超细球形氮化铁粉末的制备方法 |
CN102275922B (zh) * | 2011-06-08 | 2013-03-13 | 浙江大学 | 从农业废弃物制备SiC/氮化铁纳米复合材料及其方法 |
CN102963872B (zh) * | 2011-09-02 | 2014-11-26 | 浩华科技实业有限公司 | 一种制备氮化铁系微粉的装置及方法 |
CN105692571A (zh) * | 2014-11-28 | 2016-06-22 | 鞍钢股份有限公司 | 一种激光照射制备氮化镁的装置及方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US2872292A (en) * | 1952-03-25 | 1959-02-03 | Gen Aniline & Film Corp | Method of making iron nitrides |
SU1011507A1 (ru) * | 1981-09-14 | 1983-04-15 | Предприятие П/Я Р-6102 | Способ получени нитрида железа состава @ |
CN2144534Y (zh) * | 1992-12-25 | 1993-10-27 | 中国科学院金属研究所 | 激光气相合成超细粉的装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US2872292A (en) * | 1952-03-25 | 1959-02-03 | Gen Aniline & Film Corp | Method of making iron nitrides |
SU1011507A1 (ru) * | 1981-09-14 | 1983-04-15 | Предприятие П/Я Р-6102 | Способ получени нитрида железа состава @ |
CN2144534Y (zh) * | 1992-12-25 | 1993-10-27 | 中国科学院金属研究所 | 激光气相合成超细粉的装置 |
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