恒安冶金氮化�?参数-价格-中国粉体罐�/title>

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} }); function showliuyan(me, showtype){ if(showtype==0){ //$("#Content").val($("#Content").attr('placeholder')); Content= document.getElementById('PopMsgFrom').Content.getAttribute('placeholder'); document.getElementById('PopMsgFrom').Content.value=Content; } if(showtype==1){ // $("#Content").val($(me).text()); alert($(me).text()); document.getElementById('PopMsgFrom').Content.value=$(me).text(); } $(".fxp").css("display","flex"); } function close_popwin(){ $(".fxp").css("display","none"); // 关闭虚拟电话后的留言� $(".dhxj").css("display","none"); $(".dhxjbox").css("display", "none"); $(".dhxjbox2").css("display", "none"); return false; } </script>  <div class="cpjs"> <div class="cpjs_tab"> <div class="js_cpjj" style="border-bottom: 3px solid #1479d7; color: #1479d7;">产品介绍</div> <div class="js_cxd">创新炸�/div> <div class="js_xgfa">相关方案</div> <div class="js_xgzl">相关资料</div> <div class="js_yhpl">用户评论</div> <div class="js_gsdt">公司动�?/div> <div class="js_wsj">问商宵�/div> </div> <script> $(function(){ // 切换 $(".cpjs_tab a").click(function(){ $(".cpjs_tab a").css({"color":"#4F5862","border-bottom-color":"transparent"}); $(this).css({"color":"#1479d7","border-bottom-color":"#1479d7"}); }); }); </script>  <div class="cpjj"> <p><br/></p><p> 氮化硅的分子式为Si3N4，分子量�?40.28，按重量百分比，其中硅占60.06%,氮占39.94%。两种元素电负性相近，属强共价键结合的化合物。颜色为灰色、白色或灰白色，六方晶系、晶体呈六面体，密度3.44，硬�?~9.5，努氏硬度约�?200，显微硬度为 32630MPa，熔�?900℃。通常在常压下1900℃分解，不溶于水，溶于氢氟酸。在空气中开始氧化的温度 1300~1400℃，弹性模量为28420~46060MPa，耐压强度�?90MPa�?285摄式度时与二氮化二钙反应生成二氮硅化钙，600度时使过渡金属还原，放出氮氧化物，抗弯强度为147MPa、�/p><p> 氮化硅可由硅粉在氮气中加热或卤化硅与氨反应而制得。氮化硅具有硬度高，熔点高，结构稳定，绝缘性能良好、并且耐磨损；除氢氟酸外，它不与其他无机酸反应，抗腐蚀能力强，高温时抗氧化�?nbsp;</p><p><br/></p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; font-size: 14px; margin: 10px 0 0; line-height: 26px;"> 暂无数据� </p> </div>  <div class="xgfa"> <div class="xgfa_tit"> <div> <span></span>相关方案 </div> </div> <div class="xgfa_box" style="display: block;"><div style="padding:10px;">暂无相关方案、�/div> </div> </div> <script> $(function(){ // 切换 $(".xgfa_tit_ul li").hover(function(){ $(".xgfa_tit_ul li").css({"color":"#4F5862","border-bottom-color":"transparent"}); 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