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class="news_xaingxi"><h1>˜q™ä¸ªäº§å“æ˜¯æ€Žæ ·çƒ§ç»“而成çš?/h1></div> <div class="news_author"> 来源åQ?a href='http://www.pmghym.live/news/138.html'>http://www.pmghym.live/news/138.html</a>   å‘布旉™—´åQ?019-01-21 </div> <div class="news_content"> <p><div style="text-align:center;"> <span style="font-size:16px;">˜q™ä¸ªäº§å“æ˜¯æ€Žæ ·çƒ§ç»“而成çš?/span> </div> <div style="text-align:center;"> <span style="font-size:16px;"></span><img src="http://www.pmghym.live/uploads/news/20190121064046.jpg" /><span style="font-size:16px;"></span> </div> <span style="font-size:16px;">        ˜q™ä¸ªäº§å“æ˜¯æ€Žæ ·çƒ§ç»“成的åQŒæ˜¯ç”Þp¿™ä¸ªäñ”品和˜q™æ ·æˆ–é‚£æ ïLš„很难而且也不好熔的金属的¾l“合金属¾_‰æœ«å†‰™‡‘制成的一¿Ué‡‘属材料ã€?/span><br /> <span style="font-size:16px;">江这个äñ”品烧¾l“是ž®†ç²‰æœ«åŽ‹å…¥é’¢å¯ä¸­åQŒåŠ çƒ­åˆ°ä¸€å®šæ¸©åº¦ï¼ˆçƒ§ç»“温度åQ‰ï¼Œòq¶ä¿æŒä¸€å®šæ—¶é—ß_¼ˆä¿æ¸©æ—‰™—´åQ‰ï¼Œç„¶åŽå†·å´åQŒä»¥èŽ·å¾—<b>¼‹¬è´¨åˆé‡‘</b>材料所需的性能ã€?/span><br /> <span style="font-size:16px;">        ¼‹¬è´¨åˆé‡‘的烧¾l“过½E‹å¯åˆ†äؓ四个基本阶段åQ?/span><br /> <span style="font-size:16px;">        ä¸€ã€åœ¨åŽ»é™¤æˆåŞ剂和预烧¾l“阶ŒDµï¼Œçƒ§ç»“体变化如下:</span><br /> <span style="font-size:16px;">在烧¾l“初期,随着温度的升高,成型剂逐渐分解或蒸发,排除了烧¾l“矿。同æ—Óž¼Œæˆåž‹å‰‚会或多或少地增加烧¾l“矿的含¼„³é‡åQŒè€Œå«¼„³é‡ä¼šéšç€æˆåž‹å‰‚çš„¿Uç±»å’Œæ•°é‡ä»¥åŠçƒ§¾l“工艺的不同而变化ã€?/span><span style="font-size:16px;">在烧¾l“温度下åQŒæ°¢å¯ä»¥é™ä½Žé’´å’Œé’¨çš„氧化物。如果在真空中去除成型剂òq¶çƒ§¾l“,则碳和氧之间的反应不强。粉末颗¾_’间的接触应力逐渐消失åQŒç»“合金属粉末开始恢复和再结æ™Óž¼Œè¡¨é¢å¼€å§‹æ‰©æ•£ï¼ŒåŽ‹å®žå¼ºåº¦å¢žåŠ ã€?/span><br /> <span style="font-size:16px;">二、固相烧¾l“(800℃共晶温度)</span><span style="font-size:16px;">在液相发生前的温度下åQŒé™¤äº†ç‘ô¾l­å‰ä¸€é˜¶æ®µçš„过½E‹å¤–åQŒå›ºç›¸ååº”和扩散加剧åQŒå¡‘性流动增加,烧结体明显收¾~©ã€?/span><br /> <span style="font-size:16px;">三、液相烧¾l“阶ŒDµï¼ˆå…±æ™¶æ¸©åº¦çƒ§ç»“温度åQ?/span><span style="font-size:16px;">当液相在烧结体中发生æ—Óž¼Œæ”¶ç¾ƒå¾ˆå¿«å®ŒæˆåQŒç„¶åŽå‘生结晶è{变,形成合金的基本结构和¾l„织ã€?/span><br /> <span 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