(1.安徽機(jī)電學(xué)院 機(jī)械工程系，蕪湖 241000;
2. 哈爾濱工業(yè)大學(xué) 復(fù)合材料研究所， 哈爾濱 150001)
摘 要: 通過(guò)自蔓延高溫燃燒合成，結(jié)合準(zhǔn)熱等靜壓工藝 (SHS/PHIP)制備了相對(duì)密度超過(guò)94%的TiB-xTi基金屬陶瓷復(fù)合材料，研究了金屬Ti含量對(duì)燃燒合成TiB-Ti基金屬陶瓷復(fù)合材料的影響。研究結(jié)果表明：隨著Ti含量的增加，絕熱溫度、燃燒溫度和燃燒速度均降低，反應(yīng)產(chǎn)物主要由TiB和Ti兩相組成，部分產(chǎn)物還有TiB2相存在，產(chǎn)物組織中，TiB相主要有針狀、棒狀和片狀等形態(tài)，增強(qiáng)相的尺寸隨Ti含量的增加而減小；隨Ti含量的增加，產(chǎn)物的抗彎強(qiáng)度、抗拉強(qiáng)度、抗壓強(qiáng)度和斷裂韌性提高，且在Ti含量為40%(質(zhì)量分?jǐn)?shù))時(shí)達(dá)到最大值。
關(guān)鍵字: 燃燒合成；準(zhǔn)熱等靜壓；金屬陶瓷；硼化鈦
（1.Department of Mechanical Engineering，
Anhui Institute of Mechanical and Electronical Engineering，
Wuhu 241000, China;
2.Center for Composite Materials，Harbin Institute of
Technology， Harbin 150001, China）
Abstract:The TiB-Ti cermets with high relative density were fabricated by self-propagating high temperature synthesis and pseudo hot isostatic pressing (SHS/PHIP) process. The effect of Ti content on TiB-xTi cermets was investigated . The adiabatic temperatures，combustion temperatures and combustion velocity decrease with Ti content increasing for TiB-xTi system. The synthesized TiB-Ti cermets mainly consist of TiB and Ti phases，but little TiB2 phase exists in some products. TiB phase has three morphologies， i.e. needle-like，rod-like，plate-like, in the microstructure of synthesized TiB-xTi composites. The size of TiB grain decreases with an increasing amount of metal addition. The introduction of Ti into TiB-xTi cermets results in a drastic increase in the bending strength，tensile strength，compression strength，fracture toughness, and the maximum value is obtained with the addition of 40%Ti(mass fraction). It is proved that 40% metal content is the optimal constituent for synthesized TiB-Ti cermets.
Key words: combustion synthesis; pseudo hotisostatic pressing; cermet; titanium boride
