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Preparation of new functional materials using low temperature densification by HIP

HIP低温致密化制备新型功能材料

基本信息

批准号：
08650995
负责人：
ITO Shigeru
金额：
$ 1.41万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

Fe_4N magnetic material and SiO_2 amorphous-crystalline composite were sinterd at low temperature by applying Hipping pressure. At high temperature, Fe_4N decomposes and amorphous SiO_2 with crystalline SiO_2 is crystallized.1.Hip sintering of Fe_4N The sealed capsule containing Fe_4N powder was hipped at 450-550ﾟC for 2 hours under 50-200Mpa. The maximum relative density 97% was obtained for the specimen hipped at 500ﾟC under 200MPa. THe maximum saturation magnetization 182emu/g was measured for a specimen obtained at 450ﾟC under 200MPa.The HIP technique was also applied to the mixture of Fe_4N and Fe, in order to obtain low eddy current loss and high saturation magnetization. The resistivity of hipped Fe4N-Fe composite with 96wt% Fe_4N was 7.08 * 10^<-5> OMEGAcm, which was ten times larger than that of iron. The iron loss was decreased to 10 W by the addition 70wt% of Fe_4N to Fe, compared with 19 W in pure iron.2.Hip sintering of SiO_2 amorphous -crystalline composite The mixed powder of alpha-quartz and SiO_2 glass was pressed into a compact with PHI 12mm * 20mm in size.The Pyrex glass capsule containing the compact was hipped at 800-1200ﾟC for 30-240 minutes under the pressure of 50-200MPa. Tne specimens with the appearance of natural agate : were obtained at 120ﾟC under 100 and 200MPa. The polarization microphotograph showed that the crystallites were in the amorphous SiO_2 matrix. Using the starting mixture with 25wt% of alpha-quartz, the maximum density of 2.50g/cm^3 was obtained at 1200ﾟC for 120 minutes under 200MPa. In this case, the maximum bending strength was obtained to be 9.2Kg/mm^2.corresponding to 70% of that in the natural agate.

采用Hiping压力低温烧结了Fe4N磁性材料和SiO_2非晶态复合材料。在高温下，Fe_4N分解，非晶态SiO_2与晶态SiO_2晶化。1.Fe_4N的高温烧结将含有Fe_4N粉末的密封胶囊在450-550ﾟC，50-200 Mpa下热压2小时。在500ﾟC和200 Mpa下热等静压的样品获得了最大相对密度的97%。测量了温度为450emu/g、温度为450emu/g、压力为200 Mpa的样品的最大饱和磁化强度为182emu/g，并将热等静压技术应用于Fe4N和Fe的混合物中，以获得低的涡流损耗和高的饱和磁化强度。含96wt%Fe4N的HIPFe4N-Fe复合材料的电阻率为7.08×10~(-5)~(-5)OMEGAcm，是铁的10倍。2.SiO_2非晶态复合材料的热等静压烧结将α-石英和SiO_2玻璃的混合粉末压制成PHI为12 mm×20 mm的压坯，并在800-1200ﾟ℃、50-200 Mpa的压力下热压30-240分钟。在120ﾟ℃、100和200 Mpa下获得了具有天然玛瑙外观的样品。偏光显微镜照片表明，微晶在无定形的SiO_2基质中。在原料中加入25wt%的α-石英，在200 Mpa下1200ﾟ℃保温120min，可获得最大密度为2.50g/cm~3。在这种情况下，最大抗弯强度达到9.2 kg/mm~2，相当于天然玛瑙的70%。