CAJ | 학술논문

以WC-6%Co为基本成分，计算原料紫钨、醋酸钴、有机碳及超纯炭黑配料量，称量后加入装有适量纯水的可倾斜式滚动球磨机，湿磨混匀12 h，形成复合盐料浆，然后充分搅拌，进行喷雾干燥后制备的前驱体粉末粒度在10~100μm，平均粒度为50μm。将喷雾干燥好的粉末装舟（200 g），推入高温钼丝炉中，通入氢气，还原碳化温度950℃，时间30 min制备的纳米WC-Co复合粉，粉末粒度分布窄，颗粒粒度在5~45μm，平均粒度为23.38μm。SEM、BET结果表明WC晶粒度在300 nm左右，由扫描电镜（SEM）、X光微区分析（EDS）及元素面分布图得到，W、Co、C分布均匀、Co相均匀包覆在WC晶粒周围，不存在成分偏析。 XRD的半高宽窄，晶粒细小；物相纯净，无η相。
이WC-6%Co위기본성분，계산원료자오、작산고、유궤탄급초순탄흑배료량，칭량후가입장유괄량순수적가경사식곤동구마궤，습마혼균12 h，형성복합염료장，연후충분교반，진행분무간조후제비적전구체분말립도재10~100μm，평균립도위50μm。장분무간조호적분말장주（200 g），추입고온목사로중，통입경기，환원탄화온도950℃，시간30 min제비적납미WC-Co복합분，분말립도분포착，과립립도재5~45μm，평균립도위23.38μm。SEM、BET결과표명WC정립도재300 nm좌우，유소묘전경（SEM）、X광미구분석（EDS）급원소면분포도득도，W、Co、C분포균균、Co상균균포복재WC정립주위，불존재성분편석。 XRD적반고관착，정립세소；물상순정，무η상。
Using WC-6 % Co as raw materials, the ingredients of violet tungsten oxide, cobalt acetate, organic carbon and ultrapure carbon are calculated. Then these ingredients are mixed wet with pure water in the inclinable rolling mill for 12 h. The complex salt slurry formed is sufficiently stirred with spray drying at 230 ℃inlet temperature and 125 ℃outlet temperature with 60 mL/min feeding rate and 12 000 r/min spinner speed. Then precursor powder is prepared. Its size is about 10~100μm with the average particle size 50 μm. The spray dried powders are loaded in boat (200 g), then pushed into the heated molybdenum wire furnace. Hydrogen gas is then charged, carburized&reduced at 950℃for 30 min. In this way, nano WC-Co composite powder was prepared with a narrow particle size distribution(particle size 5~45μm, an average particle size of 23.38μm). SEM and BET data indicate the grain size of WC is about 300 nm. SEM, X ray microanalysis (EDS) and the element distribution images shows that W, Co, C distribute uniformly with uniform Co phase coating around WC grain without segregation. The half height width of XRD shows fine grain size, pure phase withoutηphase.