(中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用干壓成型和還原氣氛燒結(jié)的方法制備BeO瓷片，采用正交實(shí)驗(yàn)方法分析多種燒結(jié)工藝參數(shù)和不同燒結(jié)助劑對(duì)BeO瓷片燒結(jié)后組織性能的影響。結(jié)合X射線(xiàn)衍射和SEM等方法討論評(píng)價(jià)BeO陶瓷較好的制備工藝。結(jié)果表明：添加復(fù)合助劑Fe2O3和MgO的瓷片熱導(dǎo)率最高，且在相同摻雜條件下，隨燒結(jié)溫度的提高和保溫時(shí)間的增長(zhǎng)，BeO陶瓷的熱導(dǎo)率也隨之提高。在選擇的 4個(gè)影響因素中，燒結(jié)溫度是增加BeO陶瓷相對(duì)密度及熱導(dǎo)率的重要影響因素，在1 680 ℃保溫90 min，添加復(fù)合助劑Fe2O3和MgO的瓷片室溫?zé)釋?dǎo)率最高達(dá) 186.3 W/(m∙K)。
關(guān)鍵字: BeO陶瓷；燒結(jié)；正交實(shí)驗(yàn)；熱導(dǎo)率
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The BeO ceramics were prepared by dry pressing moulding and sintering in H2 atmosphere. The influence of the different additives and sintering techniques on the microstructures and properties of BeO ceramics was studied by X-ray diffraction (XRD) and scanning electronic microscope (SEM). The influence factors were analyzed by orthogonal experiment. The results show that the thermal conductivity of the BeO ceramics with Fe2O3 and MgO is the highest in all studied ceramics. And the thermal conductivities in the ceramics increase with the increase of the sintering temperatures and time. The effects of sintering temperatures on the relative densities and the thermal conductivities are obvious. The highest thermal conductivity of BeO ceramics with Fe2O3 and MgO in room-temperature reaches 186.3 W/ (m∙K).
Key words: BeO ceramics; sintering; orthogonal experiment; thermal conductivities
