国家自然科学基金(21063003, 51064004)
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B4C在(B4C+ B2O3)中的含量分别为30%和40%，温度900 ℃，保温6 h，在金属钛表面进行固体粉末渗硼。通过XRD测定试样表面的物相。结果表明，2种不同渗剂条件下均没有TiB2生成。对于B4C含量为40%的渗剂，钛表面生成TiB，而B4C含量为30%的渗剂，生成的TiB极少，表明活性B主要由B4C提供。对于B4C含量为40%的渗剂，当温度升高到1050 ℃时，钛表面生成TiB2，而TiB的生成速度受到抑制。从热力学上以B4C、B2O3为渗剂均有可能生成TiB2和TiB。动力学上，900 ℃下，由于B在TiB中的扩散系数大于其在TiB2中的扩散系数，主要生成TiB。温度为1050 ℃，由于B在Ti中的扩散系数大于其在TiB中的扩散系数，主要生成TiB2
Pack boronizing of titanium was conducted at 900 °C and holding for 6 h when B4C content in (B4C+ B2O3) was 30% and 40% respectively. Surfaces boride was characterized by X-ray diffraction (XRD). The results show that TiB2 is not found for both B4C contents. TiB is formed on titanium surfaces when the content of B4C in (B4C+B2O3) is 40% at 900 °C, while TiB is very little when the content of B4C in (B4C+B2O3) is 30% at the same temperature. The active B is mainly supplied by B4C. TiB2 is formed at titanium surfaces and the growth of TiB is inhibited as the B4C content is 40% at 1050 °C. Both TiB2 and TiB would be formed based on thermodynamics. TiB is mainly formed at 900 °C because dynamically the diffusivity of B in TiB is higher than that in TiB2, while TiB2 is mainly formed at 1050 °C because the diffusivity of B in Ti is higher than that in TiB
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黄有国,赵 欣,任孟德,李庆余,王红强.钛金属(B4C+B2O3)固体粉末渗硼[J].稀有金属材料与工程,2013,42(1):158~161.[Huang Youguo, Zhao Xin, Ren Mengde, Li Qingyu, Wang Hongqiang. Pack Boronizing of Titanium by B4C + B2O3[J]. Rare Metal Materials and Engineering,2013,42(1):158~161.]
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- 收稿日期:2012-01-10