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本研究采用泥浆浸渗技术和热压成形工艺成功地制得了Nicalon SiC束纤维强化7740玻璃复合材料。在热压温度1200℃,压力6.7MPa,持压1h,用氮作保护气体的条件下,材料抗弯强度达780MPa,K_(1c)达25MPam~(1/2)(取p_Q=p_(max))。还研究了纤维体积含量V_f与K_(1C)的关系。实验表明:随着V_f的增加,K_(1C)增加,当V_f达到40％左右时,K_(1C)达到最大值,尔后随V_f增加而降低。本文对复合材料热压致密化机制和V_f对K_(1C)的影响进行了讨论。
In this study, Nicalon SiC fiber-reinforced 7740 glass composites were successfully fabricated by slurry infiltration and hot press forming. Under the conditions of hot pressing temperature of 1200 ℃, pressure of 6.7 MPa and holding pressure of 1 h, the flexural strength of the material reaches 780 MPa and K_ (1c) reaches 25 MPam ~ (1/2) under the condition of nitrogen as protective gas (p_Q = p_max )). The relationship between fiber volume content V_f and K_ (1C) was also studied. Experiments show that K_ (1C) increases with the increase of V_f. When V_f reaches about 40%, K_ (1C) reaches the maximum, and then decreases with increasing V_f. In this paper, the hot compaction mechanism of composites and the effect of Vf on K_ (1C) are discussed.