Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment.
Mechanical Properties of Titanium Nitride Nanocomposites Produced by Chemical Precursor Synthesis Followed by High-P,T Treatment.
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DOI：
10.3390/ma4101747
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发表时间：
2011-10-06
期刊：
影响因子：
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通讯作者：
McMillan PF
中科院分区：
文献类型：
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作者：
Bailey E;Ray NMT;Hector AL;Crozier P;Petuskey WT;McMillan PF
我们研究了高P，T退火和机械性能的纳米复合材料具有高度氮化的本体组成接近Ti 3 N4。通过金属二烷基酰胺前体的氨解，然后在流动的NH3中在400-700 °C下加热，从溶液中沉淀出无定形固体，以产生红棕色无定形/纳米晶体材料。然后将前体在2GPa和200-700 °C下致密化以形成单片陶瓷。在高磷、高睾酮处理期间，没有证据表明N2损失。微米和纳米压痕实验表明，对于0.005-3 N范围内的载荷，硬度值在4-20 GPa之间。测量杨氏模量值在200-650 GPa的范围内。从显微压痕实验确定的Palmqvist裂纹表明断裂韧性值在2-4 MPa·m1/2之间，与Si 3 N4、SiC和Al 2 O3类似。硬度的显著变化可能与这些材料中的非晶/结晶区域的分布和结晶组分的非常细的晶粒性质（~3 nm晶粒尺寸）相关。
We investigated the high-P,T annealing and mechanical properties of nanocomposite materials with a highly nitrided bulk composition close to Ti3N4. Amorphous solids were precipitated from solution by ammonolysis of metal dialkylamide precursors followed by heating at 400–700 °C in flowing NH3 to produce reddish-brown amorphous/nanocrystalline materials. The precursors were then densified at 2 GPa and 200–700 °C to form monolithic ceramics. There was no evidence for N2 loss during the high-P,T treatment. Micro- and nanoindentation experiments indicate hardness values between 4–20 GPa for loads ranging between 0.005–3 N. Young's modulus values were measured to lie in the range 200–650 GPa. Palmqvist cracks determined from microindentation experiments indicate fracture toughness values between 2–4 MPa·m1/2 similar to Si3N4, SiC and Al2O3. Significant variations in the hardness may be associated with the distribution of amorphous/crystalline regions and the very fine grained nature (~3 nm grain sizes) of the crystalline component in these materials.