CN114478020B - 一种大尺寸高结晶度h-BN陶瓷材料及其制备方法 - Google Patents
一种大尺寸高结晶度h-BN陶瓷材料及其制备方法 Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 229910010293 ceramic material Inorganic materials 0.000 title claims description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003085 diluting agent Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005049 combustion synthesis Methods 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims abstract description 11
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 10
- 150000003863 ammonium salts Chemical class 0.000 claims abstract description 6
- 239000000654 additive Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 30
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 22
- 239000002131 composite material Substances 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 239000011777 magnesium Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims 1
- 229910052582 BN Inorganic materials 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 239000000945 filler Substances 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 239000000376 reactant Substances 0.000 abstract description 2
- 239000011812 mixed powder Substances 0.000 description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 17
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 14
- 238000000498 ball milling Methods 0.000 description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910002804 graphite Inorganic materials 0.000 description 11
- 239000010439 graphite Substances 0.000 description 11
- 238000002441 X-ray diffraction Methods 0.000 description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 238000000227 grinding Methods 0.000 description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 229910052810 boron oxide Inorganic materials 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 5
- 238000011049 filling Methods 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 238000007873 sieving Methods 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 4
- 239000002135 nanosheet Substances 0.000 description 4
- 235000019270 ammonium chloride Nutrition 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000005087 graphitization Methods 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- 238000005554 pickling Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- 229910017855 NH 4 F Inorganic materials 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- SWLVFNYSXGMGBS-UHFFFAOYSA-N ammonium bromide Chemical compound [NH4+].[Br-] SWLVFNYSXGMGBS-UHFFFAOYSA-N 0.000 description 1
- AGLSQWBSHDEAHB-UHFFFAOYSA-N azane;boric acid Chemical compound N.OB(O)O AGLSQWBSHDEAHB-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002088 nanocapsule Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 description 1
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Abstract
本发明涉及一种大尺寸高结晶度六方‑氮化硼及其制备工艺,采用镁粉、硼源、稀释剂为原料,铵盐为添加剂,通过高温下铵盐分解形成气体,气体流动通道的形成带动了反应物充分接触反应,提高了反应效率,同时,燃烧合成法的高能有利于层片状h‑BN的形成,适量稀释剂的控制,能够避免层片状h‑BN出现厚度过大或者层片断裂等现象。燃烧合成的h‑BN的GI指数为1.91,这表明燃烧合成h‑BN结晶度高,本征热导率高。h‑BN片层直径范围在5‑40μm之间,这使h‑BN作为热导填料时能够显著了降低导热网络中的界面热阻,在热界面材料领域具有较大的应用潜力。
Description
技术领域
本发明涉及陶瓷领域,尤其涉及大尺寸高结晶度六方氮化硼陶瓷材料领域
背景技术
导热填料中氮化硼具有较高的热导率,较低的热膨胀系数,优良的热稳定性,较高的抗氧化性等优点,是目前较为理想的散热材料。h-BN纳米片是柔性绝缘材料中热导率最高的材料,同时少层氮化硼常温条件下的热膨胀系数为(3.58~1.67)×10-6/K,在高热导材料中性能非常突出。氮化硼是目前唯一同时兼具良好的柔性、绝缘性和低热膨胀系数的高导热材料,同时还兼具良好的化学稳定性、低密度、高强度、高韧性、高延展性、抗渗性等众多优点,是最为理想的热界面填料。
T.E.O’Connor早在“Synthesis of hexagonal boron nitride”中研究了硼酸-氨路线制备六方氮化硼,特别强调了中间加成化合物(BN)x(B2O3)y(NH3)z的产率和组成。CN101531349A中提到采用硼酸、铵盐、金属镁粉混合物制圆片状六方氮化硼多晶微粉;吉钰纯等人探讨制备花束BN纳米囊,但是上述制备大尺寸h-BN粉体方法存在反应温度高、时间长、耗能久、工艺复杂、粉体微观形貌结晶度不高等问题。
发明内容
本发明要解决的技术问题是针对上述缺点提供一种大尺寸高结晶度h-BN及其制备方法,高效节能、易于大规模生产,能够用作高导热材料。
本发明采用的技术方案为:一种大尺寸高结晶度h-BN陶瓷材料,其特征在于,所述h-BN陶瓷材料的结晶化指数不大于2.0,所述h-BN呈现不规则分布的层片状结构,其中,层片状h-BN的直径范围在5-40μm之间,所述层片状h-BN的厚度范围在30-50nm之间,所述层片状h-BN的直径厚度比在400-600之间。
进一步的,所述层片状h-BN的中位直径D50在17-25μm之间。
进一步的,所述层片状h-BN的结晶化指数在1.8-1.91之间,优选为1.91。
进一步的,所述层片状h-BN的厚度范围在35-50nm之间,优选为50nm。
进一步的,所述层片状h-BN的直径厚度比在400-550之间,优选为400、500。
一种大尺寸高结晶度h-BN陶瓷材料的制备方法,其特征在于,以镁源、硼源为原料,以铵盐为添加剂,以h-BN为稀释剂,镁源、硼源根据化学计量比混合均匀后在氮气条件下通过燃烧合成制备h-BN和MgO复合产物,利用稀盐酸对产物进行酸洗去除MgO,干燥得到大尺寸高结晶度h-BN粉体;其中氮气压力控制在0.4~1.5MPa,稀释剂添加量为硼源摩尔比的10~30%。
进一步的,所述镁源为镁粉,优选所述镁粉粒径为75~300μm,形貌为片型、球型。
进一步的,所述硼源为B2O3粉,优选所述B2O3粉粒径为100μm~400μm。
进一步的,所述铵盐为NH4Cl、NH4F、NH4Br。
进一步的,所述混合采用球磨湿法混合,将镁源、硼源、添加剂、稀释剂放入滚筒中,加入球磨剂氧化锆球或者氧化铝球,混合球磨20~60min,球料比为3:1。
进一步的,所述混合均匀后,将样品过筛、置于石墨坩埚中,充入氮气,用钨丝引燃通过燃烧合成法制备h-BN。
进一步的,将所述复合产物进行研磨,采用浓度为1mol/L的稀盐酸进行淋洗,洗至中性,过滤干燥,得到大尺寸高结晶度h-BN陶瓷材料。
为了评价分析燃烧合成h-BN的三维有序化程度(结晶度),通常采用Thomas等人定义的方法石墨化指数(Graphitization index)对h-BN的结晶度进行评价。石墨化指数用GI表示,GI值越大表示晶体的三维有序度越低,结晶度越差,否则结晶度越好。一般来说,GI值在1.60-5.00之间为结晶度良好的产物。GI值的定量计算可用六方氮化硼的X射线衍射图谱(XRD)中(100)、(101)及(102)晶面衍射峰面积之间的关系确定,如下式所示;
式中Area(100)、Area(101)和Area(102)分别代表六方氮化硼(100)、(101)和(102)晶面衍射峰的面积。
本发明燃烧合成制备h-BN陶瓷粉体过程中,反应原料如下所示:
3Mg+B2O3+N2+0.6h-BN=3MgO+2h-BN+0.6h-BN
h-BN的生成机制如图1所示,Mg和B2O3的熔化,在液相的接触界面发生还原反应生成B。B与氮气反应生成了h-BN纳米颗粒,燃烧合成的h-BN纳米颗粒在液相Mg中实现形核和传输,NH4Cl和Mg反应生成的MgCl2的存在增大了h-BN在液相Mg中的溶解度和传输速度。h-BN的生长尺寸取决于纳米片层的熟化时间,厚度受MgCl2影响较大,因此h-BN在含MgCl2的液相的Mg中最终生成了h-BN为纳米片层。
本发明的有益效果在于:采用镁粉作为还原剂,通过高温下铵盐分解形成气体,气体流动通道的形成带动了反应物充分接触反应,提高了反应效率,同时,燃烧合成法的高能有利于层片状h-BN的形成,稀释剂的加入能够有效降低反应温度,给层片状h-BN的形成提供了充分的时间,并且适量稀释剂的控制,能够避免层片状h-BN出现厚度过大或者层片断裂等现象。另一方面,镁粉在反应的同时为h-BN纳米片提供了高温的生长环境,有利h-BN的生长和结晶的作用。
燃烧合成的h-BN的GI指数为1.91,这表明燃烧合成h-BN结晶度高,本征热导率高。h-BN片层直径较大为20μm,厚度较薄为50nm,这使h-BN作为热导填料时能够显著了降低导热网络中的界面热阻,在热界面材料领域具有较大的应用潜力。
附图说明
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中:
图1.燃烧合成h-BN的反应机制原理;
图2.大尺寸高结晶度h-BN陶瓷材料复合产物的XRD图谱,(a)酸洗前;(b)酸洗后;
图3.大尺寸高结晶度h-BN陶瓷材料的SEM图,(a)h-BN横向尺寸(b)h-BN厚度;
图4.大尺寸高结晶度h-BN陶瓷材料四个区域的TEM图。
具体实施方式
实施例1.
取镁粉85g,粒径为150μm,氧化硼64g,粒径为200μm,氯化铵5.4g,稀释剂h-BN14.4g,将上述粉体置于球磨机滚筒中,加入球磨介质无水乙醇,球料比为3:1,球磨混合30min得到混合粉体。将上述混合粉体过50目筛,将其置于石墨坩埚中,放入反应釜中,充入1.0MPa氮气,之后采用钨丝引爆,通过燃烧合成法制备得到h-BN与MgO的复合产物。待冷却后,将上述复合产物进行研磨,后采用浓度为1mol/L的稀盐酸进行淋洗,溶解去除MgO,过滤烘干,得到大尺寸高结晶度h-BN。通过XRD衍射仪表征发现经过盐酸酸洗后获得产物为单相六方氮化硼,通过计算得到结晶度为1.91。通过扫描电镜观察粉体微观形貌,呈现不规则分布的层片状,对样品横向尺寸的统计可知,图3(a)显示层片状结构的直径为5-35μm,中位尺寸为20μm,图2(b)显示层片状结构的厚度为50nm左右,直径厚度比为400。这说明燃烧合成的h-BN粉体直径较大,厚度较薄,适合用作导热填料。
实施例2.
取镁粉85g,粒径为300μm,氧化硼64g,粒径为200μm,氯化铵5.4g,稀释剂h-BN14.4g,将上述粉体置于球磨机滚筒中,加入球磨介质无水乙醇,球料比为3:1,球磨混合30min得到混合粉体。将上述混合粉体过50目筛,将其置于石墨坩埚中,放入反应釜中,充入1.5M Pa氮气,之后采用钨丝引爆,通过燃烧合成法制备得到h-BN与MgO的复合产物。待冷却后,将上述复合产物进行研磨,后采用浓度为1mol/L的稀盐酸进行淋洗,溶解去除MgO,过滤烘干,得到大尺寸高结晶度h-BN。通过XRD衍射仪表征发现经过盐酸酸洗后获得产物为单相六方氮化硼,通过计算得到结晶度为1.8。通过扫描电镜观察粉体微观形貌,呈现不规则分布的层片状,对样品横向尺寸的统计可知,层片状结构的直径为10-40μm,中位尺寸为25μm,厚度为50nm左右,平均直径厚度比为500。这说明燃烧合成的h-BN粉体直径较大,厚度较薄,适合用作导热填料。
实施例3.
取镁粉85g,粒径为150μm,氧化硼68g,粒径为400μm,溴化铵10.8g,稀释剂h-BN14.4g,将上述粉体置于球磨机滚筒中,加入球磨介质无水乙醇,球料比为3:1,球磨混合30min得到混合粉体。将上述混合粉体过50目筛,将其置于石墨坩埚中,放入反应釜中,充入0.5MPa氮气,之后采用钨丝引爆,通过燃烧合成法制备得到h-BN与MgO的复合产物。待冷却后,将上述复合产物进行研磨,后采用浓度为1mol/L的稀盐酸进行淋洗,溶解去除MgO,过滤烘干,得到大尺寸高结晶度h-BN。通过XRD衍射仪表征发现经过盐酸酸洗后获得产物为单相六方氮化硼,通过计算得到结晶度为1.91。通过扫描电镜观察粉体微观形貌,呈现不规则分布的层片状,对样品横向尺寸的统计可知层片状结构的直径为10~30μm,中位尺寸为18μm,厚度为30nm左右,直径厚度比为600。这说明燃烧合成的h-BN粉体直径较大,厚度较薄,适合用作导热填料。
实施例4.
取镁粉85g,粒径为75μm,氧化硼64g,粒径为100μm,氯化铵10.8g,稀释剂h-BN14.4g,将上述粉体置于球磨机滚筒中,加入球磨介质无水乙醇,球料比为3:1,球磨混合30min得到混合粉体。将上述混合粉体过50目筛,将其置于石墨坩埚中,放入反应釜中,充入0.4MPa氮气,之后采用钨丝引爆,通过燃烧合成法制备得到h-BN与MgO的复合产物。带冷却后,将上述复合产物进行研磨,后采用浓度为1mol/L的稀盐酸进行淋洗,溶解去除MgO,过滤烘干,得到大尺寸高结晶度h-BN。通过XRD衍射仪表征发现经过盐酸酸洗后获得产物为单相六方氮化硼,通过计算得到结晶度为1.87。通过扫描电镜观察粉体微观形貌,呈现不规则分布的层片状,对样品横向尺寸的统计可知层片状结构的直径为5~25μm,中位尺寸为17μm,厚度为35nm左右,直径厚度比为550。这说明燃烧合成的h-BN粉体直径较大,厚度较薄,适合用作导热填料。
实施例5.
取镁粉85g,粒径为150μm,氧化硼64g,粒径为200μm,氟化铵5.4g,稀释剂h-BN14.4g,将上述粉体置于球磨机滚筒中,加入球磨介质无水乙醇,球料比为3:1,球磨混合30min得到混合粉体。将上述混合粉体过50目筛,将其置于石墨坩埚中,放入真空反应釜中,充入0.5MPa氮气,之后采用钨丝引爆,通过燃烧合成法制备得到h-BN与MgO的复合产物。带冷却后,将上述复合产物进行研磨,后采用浓度为1mol/L的稀盐酸进行淋洗,溶解去除MgO,过滤烘干,得到大尺寸高结晶度h-BN。通过XRD表征发现经过盐酸酸洗后获得产物为单相六方氮化硼,通过计算得到结晶度为1.7。通过扫描电镜观察粉体微观形貌,呈现不规则分布的层片状,对样品横向尺寸的统计可知层片状结构的直径为10~35μm,中位尺寸为20μm,厚度为50nm左右,直径厚度比为400。这说明燃烧合成的h-BN粉体直径较大,厚度较薄,适合用作导热填料。
Claims (3)
1.一种大尺寸高结晶度h-BN陶瓷材料的制备方法,其特征在于,以镁源、硼源为原料,以铵盐为添加剂,以h-BN为稀释剂,镁源、硼源根据化学计量比混合均匀后在氮气条件下通过燃烧合成制备h-BN和MgO复合产物,利用酸洗去除产物中的MgO,干燥得到大尺寸高结晶度h-BN粉体;所述的大尺寸高结晶度h-BN粉体,其层片状h-BN的中位直径D50在17-25μm之间,所述层片状h-BN的结晶化指数在1.8-1.91之间,所述层片状h-BN的直径厚度比在400-550之间。
2.如权利要求1所述的大尺寸高结晶度h-BN陶瓷材料的制备方法,其特征在于,氮气压力控制在0.4~1.5MPa,稀释剂添加量为硼源摩尔比的10~30%。
3.如权利要求1所述的大尺寸高结晶度h-BN陶瓷材料的制备方法,其特征在于,所述镁源为镁粉,镁粉粒径为75~300μm,形貌为片型、球型;所述硼源为B2O3粉,B2O3粉粒径为100μm~400μm。
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CN102757025A (zh) * | 2012-05-08 | 2012-10-31 | 辽宁科技大学 | 高温自蔓延合成高密度六方氮化硼的方法 |
CN104233454A (zh) * | 2014-06-17 | 2014-12-24 | 中山大学 | 一种高效合成单晶六方氮化硼结构的取代反应方法 |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101531349A (zh) * | 2009-04-01 | 2009-09-16 | 武汉工程大学 | 圆片状六方氮化硼多晶微粉的制备方法 |
CN102757025A (zh) * | 2012-05-08 | 2012-10-31 | 辽宁科技大学 | 高温自蔓延合成高密度六方氮化硼的方法 |
CN104233454A (zh) * | 2014-06-17 | 2014-12-24 | 中山大学 | 一种高效合成单晶六方氮化硼结构的取代反应方法 |
CN106430126A (zh) * | 2016-11-01 | 2017-02-22 | 河北正雍新材料科技有限公司 | 一种高结晶度六方氮化硼粉体的制备方法 |
Non-Patent Citations (1)
Title |
---|
裴立宅编.氮化硼.《高技术陶瓷材料》.合肥工业大学出版社,2015,(第1版),第64页. * |
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