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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>　氮化硼又称“白色石墨”，理论密度2.27g/ cm3,比重�?.43，莫式硬度为2。六方氮化硼是具有良好的电绝缘性，导热性，化学稳定性，无明显熔点，�?.1MPA氮气�?000℃，在中性还原气氛中，耐热�?000℃，在氮和氩中使用温度可达到2800℃，在氧气气氛中稳定性较差，使用温度1000℃以下。六方氮化硼的膨胀系数相当于石英，但导热率却为石英的十倍、�/p><p> 　　六方氮化硼不溶冷水，水煮沸时水解非常缓慢并产生少量的硼酸和氨，与弱酸和强碱在室温下均不起反应，微溶于热酸，用熔融的氢氧化钠，氢氧化钾处理才能分解、�/p><p>　<strong>产品特�?/strong></p><p> 　　1、高耐热性：3000℃升华，其强�?800℃为室温�?倍，1500℃空冷至室温数十次不破裂，在惰性气体中2800℃不软化、�/p><p> 　　2� 高导热系数：热压制品�?3W/M.K和纯铁一样，�?30℃以上是陶瓷材料中导�?*的材料、�/p><p> 　　3� 低热膨胀系数�?×10-6的膨胀系数仅次于石英玻璃，是陶瓷中*小的，加上其具有高导热性，所以抗热震性能很好、�/p><p> 　　4� 优良的电性能：高温绝缘性好�?5℃为1014Ω-cm,2000℃还可以达到103Ω-cm,是陶瓷中**的高温绝缘材料，击穿电压3KV/MV,低介电损�?08HZ时为2.5×10-4，介电常数为4，可透微波和红外线、�/p><p> 　　5� 良好的耐腐蚀性：与一般金�?铁、铜、铝、铅�?、稀土金属，贵重金属，半导体材料(锗、硅、砷化钾)，玻璃，熔盐(水晶石、氟化物、炉�?、无机酸、碱不反应、�/p><p> 　　6� 低的摩擦系数：U�?.16，高温下不增大，比二硫化钼，石墨耐高温，氧化气氛可用�?00℃，真空下可用到2000℃、�/p><p> 　　7� 高纯度好B高：其杂质含量小�?0PPM，而含B大于43.6%、�/p><p> 　　8� 可机械加工性：其硬度为莫氏2，所以可用一般机械加工方法加工成精度很高的零部件制品</p><p> </p><p> 　　<strong>主要产品用逓�/strong></p><p> 　　1� 氮化硼是金属成型的脱模剂和金属拉丝的润滑剂、�/p><p> 　　2� 氮化硼在高温状态下的特殊电解、电阻材料、�/p><p> 　　3� 氮化硼适用于高温固体润滑剂，挤压抗磨添加剂，生成陶瓷复合材料的添加剂，耐火材料和抗氧化添加剂、�/p><p> 　　4� 氮化硼适用于晶体管的热封干燥剂和塑料树脂等聚合物的添加剂、�/p><p> 　　5� 压制成各种形状的氮化硼制品可用做高温、高压、绝缘、散热部件、�/p><p> 　　6� 氮化硼是航天航空中的热屏蔽材料、�/p><p> 　　7� 在触媒参与下，经高温高压处理可转化为坚硬如金刚石的立方氮化硼、�/p><p><br/></p> </div>  <div class="cxd"> <div class="cxd_tit"><span></span>创新炸�/div> <p style=" color: #333; 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