(武漢理工大學(xué) 材料復(fù)合新技術(shù)國家重點(diǎn)實(shí)驗(yàn)室， 武漢 430070)
摘 要: 采用自蔓延高溫合成(Self-propagating high-temperature synthesis, SHS)技術(shù)和熱壓燒結(jié)(Hot pressing, HP)方法分別研究了Zr-B2O3-Mg和ZrO2-B4C-C體系反應(yīng)原料的粒度和配比以及燒結(jié)溫度對(duì)產(chǎn)物的影響規(guī)律， 并燒結(jié)得到ZrB2陶瓷。 采用X射線衍射和化學(xué)分析方法分析了材料的相組成， 利用SEM和TEM觀察了顯微結(jié)構(gòu)； 并用阿基米德排水法測(cè)定了相對(duì)密度。 結(jié)果表明： 在Zr-B2O3-Mg體系中， 50 μm Zr粉和Mg過量15%(摩爾分?jǐn)?shù))的體系是最理想的SHS反應(yīng)體系； SHS產(chǎn)物粒徑、 酸洗產(chǎn)物粒徑和燒結(jié)體粒徑分別為2～5 μm、 0.5～2.0 μm和2～10 μm； 酸洗產(chǎn)物組成為94.59%ZrB2、 3.87%ZrO2和1.54%H3BO3(質(zhì)量分?jǐn)?shù)); 燒結(jié)體為單相ZrB2陶瓷， 相對(duì)密度為95.4%。 在ZrO2-B4C-C體系中， B4C過量15%和C過量10%(摩爾分?jǐn)?shù))的體系是最理想的反應(yīng)體系； 燒結(jié)體相對(duì)密度為94%； 燒結(jié)體組成為95.44%ZrB2、 3.87%ZrO2、 0.32%B4C和0.37%C(質(zhì)量分?jǐn)?shù))。
關(guān)鍵字: 二硼化鋯； 自蔓延高溫合成； 熱壓燒結(jié)
（ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China）
Abstract: ZrB2 ceramics were prepared by self-propagating high-temperature synthesis (SHS) and hot pressing (HP). The effects of granularities and dosages of raw materials in Zr-B2O3-Mg system on SHS process and product, as well as sintering temperature in ZrO2-B4C-C system on sintered product, were investigated. The phase constituent was analyzed by X-ray diffraction and chemical analysis. The microstructure of samples was observed by SEM and TEM. The density was measured based on Archimedes drainage method. The results indicate that, in Zr-B2O3-Mg system, the ideal SHS reactants are 50 μm Zr powder and 15% (molar fraction) excessive Mg powder; the particle sizes of SHS product, acid-leached product and sintered product are 2-5 μm, 0.5-2 μm and 2-10 μm respectively; the acid-leached product consists of 94.59%ZrB2, 3.87%ZrO2 and 1.54%H3BO3 (mass fraction); and the relative density of sintered product is 95.4%. In ZrO2-B4C-C system, the reaction system of excessive 15%B4C and excessive 10%C (molar fraction) are the best; for the sintered product, the relative density is 94%; and it is a mixture of 95.44%ZrB2, 3.87%ZrO2, 0.32%B4C and 0.37%C (mass fraction).
Key words: zirconium diboride ; self-propagating high-temperature synthesis; hot pressing
