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Production of B{sub}4C/Al composites

机译：生产B {SUB} 4C / AL复合材料

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The infiltration technique for fabricating B{sub}4C-Al composites has been investigated. As the first stage of shaping B{sub}4C preforms via slip casting, suspension stabilization conditions were determined by varying the pH level. A stabile suspension is obtained at pH 7 for suspension containing 35 mass % B{sub}4C. Preformed samples were sintered at 2000°C for 30 minutes. Samples thus prepared had a theoretical density of 62.5 %, flexure strength of 75 MPa and fracture toughness of 3 MPa.m{sup}(1/2) after the sintering process. Muminum infiltration was conducted at 1100, 1150 and 1200°C for 15 and 30 minutes in a graphite resistance furnace under vacuum. Densities increase from 2.58 g/cm{sup}3 to 2.66 g/cm{sup}3 with increasing infiltration temperature for both 15 minutes and 30 minutes infiltration periods. Hardness of Al infiltrated B{sub}4C changed from 5.3 GPa to 10.5 GPa for 15 minutes infiltration time and from 5.6 GPa to 11.8 GPa for 30 minutes infiltration time with increasing infiltration temperature. Flexure strengths and fracture toughnesses values decreased with increasing infiltration time and temperature. The highest flexure strength and fracture toughness obtained were 395 MPa and 15.25 MPa.m{sup}(1/2) at 1100°C infiltration temperature for 15 minutes infiltration time.
机译：研究了用于制造B {SUB} 4C-Al复合材料的渗透技术。作为通过滑浇的第一阶段的成型B {Sub} 4C预制件，通过改变pH水平来确定悬浮稳定条件。在pH7处获得稳定悬浮液，用于含有35质量％B {Sub} 4C的悬浮液。将预制样品在2000℃下烧结30分钟。由此制备的样品的理论密度为62.5％，弯曲强度为75MPa的弯曲强度，并且在烧结过程之后的3MPa.m}（1/2）的断裂韧性。在真空下，在1100,1150和1200℃下在1100,1150和1200℃下进行Muminum渗透，在石墨电阻炉中进行15和30分钟。密度从2.58g / cm {sup} 3至2.66g / cm {sup} 3增加，渗透温度增加15分钟和30分钟渗透期。 Al渗透的B {Sub} 4C的硬度从5.3GPa到10.5GPa变为15分钟渗透时间，从5.6GPa到11.8GPa到30分钟渗透时间随着渗透温度的增加。弯曲强度和断裂韧性值随着渗透时间和温度的增加而降低。获得的最高挠曲强度和裂缝韧性在1100℃渗透温度下为395MPa和15.25mPa.m {sup}（1/2），渗透温度15分钟。

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