(燕山大學(xué) 材料科學(xué)與工程學(xué)院， 秦皇島 066004)
摘 要: 在高溫(1400℃)、 超高壓(4.2 GPa)條件下制備了Al-ZrO2(Y2O3)-Si3N4燒結(jié)體。采用XRD分析及力學(xué)強(qiáng)度測(cè)試等方法， 研究了Al對(duì)ZrO2相變能力及ZrO2增韌燒結(jié)體作用的影響。結(jié)果表明：在燒結(jié)體中加入2%Al， 利用Al與N反應(yīng)生成AlN可阻止Zr-O-N化合物生成，避免ZrO2在Si3N4基體中被N穩(wěn)定生成不可相變t′-ZrO2，提高ZrO2的t→m相變能力， 使ZrO2起到增韌氮化硅燒結(jié)體的作用；當(dāng)Y2O3含量為2%～2.5%(摩爾分?jǐn)?shù))時(shí)， 燒結(jié)體抗壓強(qiáng)度及斷裂韌性均較高， ZrO2相變?cè)鲰g作用最大。
關(guān)鍵字: 鋁； ZrO2； 增韌； Si3N4
（College of Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P.R.China）
Abstract:Al-ZrO2Si3N4 composites were sintered at high temperature (1400℃) and ultrahigh pressure(4.2 GPa). The effects of Al on the t→m ZrO2 phase transformation and the toughness increment of sintered Si3N4 were investigated by XRD and mechanical tests. The results showed that 2%Al in the sintered material can prevent N from stabilizing ZrO2 to form t′-ZrO2 by producing AlN, both the potential of t→m phase transformation of ZrO2 and toughness of sintered Si3N4 are increased. ZrO2(Y2O3)-Si3N4 has a combination property of high compressive strength and high impact toughness when Y2O3 content is 2.0%～2.5%(mole fraction).
Key words: aluminum； ZrO2； toughness; Si3N4
