功能材料
功能材料
공능재료
JOURNAL OF FUNCTIONAL MATERIALS
2014年
19期
19040-19044
,共5页
谢炜%彭顺文%匡加才%徐华%邓应军%郑亚亚%王真
謝煒%彭順文%劻加纔%徐華%鄧應軍%鄭亞亞%王真
사위%팽순문%광가재%서화%산응군%정아아%왕진
隐晶质石墨%热扩散率%复合材料%导热性能
隱晶質石墨%熱擴散率%複閤材料%導熱性能
은정질석묵%열확산솔%복합재료%도열성능
aphanitic graphite%thermal diffusivity%composites%thermal conductivity
以天然隐晶质石墨为导热填料,聚乙烯醇(PVA)为粘结剂,采用热压法制备了隐晶质石墨/PVA 导热复合材料,研究了纯化前后隐晶质石墨含量与粒径对复合材料导热性能的影响.结果表明,随着石墨含量增加,复合材料的热扩散率上升.隐晶质石墨含量分别为89%和99%时,原矿隐晶质石墨制备的复合材料热扩散率分别为5.224和7.459 mm2/s,纯化后隐晶质石墨制备的复合材料热扩散率则为7.839和9.458 mm2/s,纯化后复合材料热扩散率较原矿提高;纯化前后隐晶质石墨在未球磨和以300~600 r/min球磨时,随着平均粒径的减小,复合材料的热扩散率下降.原矿球磨后隐晶质石墨/PVA 复合材料热扩散率从5.224 mm2/s 减小到4.682 mm2/s,纯化后球磨隐晶质石墨/PVA 复合材料热扩散率从7.839 mm2/s 下降到6.019 mm2/s.研究表明,隐晶质石墨/PVA 复合材料导热性能随着石墨含量的提高而增强,随着石墨粒径的减小而减弱.
以天然隱晶質石墨為導熱填料,聚乙烯醇(PVA)為粘結劑,採用熱壓法製備瞭隱晶質石墨/PVA 導熱複閤材料,研究瞭純化前後隱晶質石墨含量與粒徑對複閤材料導熱性能的影響.結果錶明,隨著石墨含量增加,複閤材料的熱擴散率上升.隱晶質石墨含量分彆為89%和99%時,原礦隱晶質石墨製備的複閤材料熱擴散率分彆為5.224和7.459 mm2/s,純化後隱晶質石墨製備的複閤材料熱擴散率則為7.839和9.458 mm2/s,純化後複閤材料熱擴散率較原礦提高;純化前後隱晶質石墨在未毬磨和以300~600 r/min毬磨時,隨著平均粒徑的減小,複閤材料的熱擴散率下降.原礦毬磨後隱晶質石墨/PVA 複閤材料熱擴散率從5.224 mm2/s 減小到4.682 mm2/s,純化後毬磨隱晶質石墨/PVA 複閤材料熱擴散率從7.839 mm2/s 下降到6.019 mm2/s.研究錶明,隱晶質石墨/PVA 複閤材料導熱性能隨著石墨含量的提高而增彊,隨著石墨粒徑的減小而減弱.
이천연은정질석묵위도열전료,취을희순(PVA)위점결제,채용열압법제비료은정질석묵/PVA 도열복합재료,연구료순화전후은정질석묵함량여립경대복합재료도열성능적영향.결과표명,수착석묵함량증가,복합재료적열확산솔상승.은정질석묵함량분별위89%화99%시,원광은정질석묵제비적복합재료열확산솔분별위5.224화7.459 mm2/s,순화후은정질석묵제비적복합재료열확산솔칙위7.839화9.458 mm2/s,순화후복합재료열확산솔교원광제고;순화전후은정질석묵재미구마화이300~600 r/min구마시,수착평균립경적감소,복합재료적열확산솔하강.원광구마후은정질석묵/PVA 복합재료열확산솔종5.224 mm2/s 감소도4.682 mm2/s,순화후구마은정질석묵/PVA 복합재료열확산솔종7.839 mm2/s 하강도6.019 mm2/s.연구표명,은정질석묵/PVA 복합재료도열성능수착석묵함량적제고이증강,수착석묵립경적감소이감약.
Regarding natural aphanitic graphite and PVA as thermal conducting fillers and binder respectively, the research adopts the hot pressing method to prepare the thermal conductive composite of aphanitic graphite/PVA.Meanwhile,the influence of the content and particle of aphanitic graphite before and after purification on the composites’thermal conductivity was studied.The indications of the results were as follows:on the one hand,along with the increase of graphite content,the thermal diffusivity of composites rises,namely when the content of aphanitic graphite was 89% and 99% respectively,the thermal diffusivity of composites was 5.224 and 7.459 mm2/s respectively by the preparation of raw ore,and the thermal diffusivity of composites was 7.839 and 9.458 mm2/s respectively by the preparation of aphanitic graphite after purification,which suggest that the thermal diffusivity of composites through the purification was better improved than raw ore.On the other hand, when the aphanitic graphite before and after purification without milling and the milling with the speed of 300-600 r/min,the thermal diffusivity of composites declines along with the reduce of average particle size,namely the thermal diffusivity of composites including the aphanitic graphite by the milling of raw ore and PVA drops to 4.682 from 5.224 mm2/s,and the thermal diffusivity of composites covering the aphanitic graphite by the milling of purification and PVA falls to 6.01 9 from 7.839 mm2/s.According to the above results,it was turned out that the thermal conductivity of composites from the effect of the content and particle of aphanitic graphite increases with the improvement of graphite content and decreases with the diminution of graphite content.