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Development of Rapid Sintering Technique on Metal Powder by Considering the Saving Energy and Environmental Pollution Plan

考虑节约能源和环境污染的方案开发金属粉末快速烧结技术

基本信息

批准号：
11650729
负责人：
NAKAMURA Mitsuru
金额：
$ 2.11万
依托单位：
Iwate University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650729/
关键词：
Rapid sintering technique High frequency induction method Carbon steel High strength-alloyed steel vacuum condition decarburized layer Radial crushing strength Total evaluation 高速焼結技術焼結高強度合金網網焼結炭素鋼窒素雰囲気ガス窒素-水素雰囲気ガス鉄化合物恒温保

项目摘要

This research was purposed by rapid sintering process used the high frequency heating instrument that compared to conventional sintering furnace. Rapid sintering technique within a few minutes is to investigate 2 types of steels (carbon steel and high strength-alloyed steels). And, the research atmosphere changed to 3 types of vacuum, nitrogen and nitrogen-hydrogen. The results were obtained as follows.1 Case of carbon steel under vacuum conditionThere is very important factor both the removal of adsorbed gas in powder grain surface and accompanied by the diffusion and sintering of each powder. The isothermal treatment when the sintering process in this experiment was a key technology treatment. This method was finished to sinter only 3 minutes, and it's condition was maximum heating time-30 s, sintering condition 1523 K-60 s and isothermal treatment-90 s holding only.2 Case of carbon steel under nitrogen gas atmosphere conditionIt was important to release an adsorbed gas in iron powde … More r particle surface. The product of decarburized layer on specimen surface was a problem because of reduces of mechanical properties. This method was finished to sinter only 3.5 minutes, and the radial crushing strength (RCS) was obtained almost same value compared to conventional furnace method.3 Case of carbon steel under nitrogen-hydrogen gas atmosphere conditionIn the case, added low H2 gas concentration from 1 to 2 %, RCS and prevention of decaburization were almost same values compared to rapid sintering of 100 % N2 gas atmosphere. This lowering tendency of RCS was caused to form FeOOH compound by the present of H2 gas and this compound prevented to diffusion of Cu elements.4 Case of high strength-alloyed steel under vacuum conditionThis rapid sintering needs to control the degassing, diffusion of additional alloying elements and form a Martensite or Bainite structure in matrix and these are very important factor for the sintering process. It can be understood that this sintering process needs the highest sintering temperature compared with conventional furnace process but obtained comparatively higher RCS by changing the holding time. This process took only 3〜4 minutes for holding time, in spite of high strength-alloyed steel required longer time for diffusion of additional alloying elements. Less

采用高频加热仪器对快速烧结工艺进行了研究，并与传统烧结炉进行了比较。快速烧结技术是在几分钟内研究两种钢（碳钢和高强度合金钢）。研究气氛改为真空、氮气、氮氢三种气氛。结果如下：1真空条件下碳钢的情况，粉末颗粒表面吸附气体的去除和各粉末的扩散和烧结是非常重要的因素。本实验烧结过程中的等温处理是关键的工艺处理。该方法烧结时间为3分钟，烧结条件为最大加热时间30秒，烧结条件为1523k -60秒，等温处理-90秒在氮气气氛条件下碳钢的实例铁粉中吸附气体的释放具有重要意义。脱碳层在试样表面的生成是一个问题，因为它降低了试样的力学性能。该方法烧结完成时间仅为3.5分钟，获得的径向破碎强度（RCS）与常规炉法基本相同碳钢在氮气-氢气气氛条件下，加入浓度为1 ~ 2%的低H2气体，与100% N2气氛下快速烧结相比，RCS和防止脱碳的数值几乎相同。这种降低RCS的趋势是由于H2气体的存在而形成FeOOH化合物，该化合物阻止了Cu元素的扩散高强度合金钢在真空条件下的快速烧结需要控制脱气、附加合金元素的扩散和在基体中形成马氏体或贝氏体组织，这些是烧结过程的重要因素。可以理解为，该烧结工艺所需的烧结温度高于常规炉法，但通过改变保温时间可以获得较高的RCS。这个过程只需要3 ~ 4分钟的保温时间，尽管高强度合金钢需要更长的时间来扩散额外的合金元素。少