摘要
利用双层辉光离子渗金属技术,在Q235钢表面合成TiN渗镀层,从渗镀层厚度、相结构、表面形貌、表面成分、外观和表面显微硬度等方面研究不同的Ar、N2流量比对形成TiN渗镀层的影响。结果表明,A、rN2流量比对合成TiN渗镀层的厚度基本无影响;随着Ar、N2流量比的降低,TiN渗镀层由(200)转化为(111)择优取向生长;在各流量比下的渗镀层均呈"胞状"形貌,但流量比越低,胞状向外"突起"现象越明显,渗镀层越致密,表面硬度也相对越高;当流量比为8∶1时,TiN渗镀层表面Ti、N原子个数比最接近1∶1;TiN渗镀层表面颜色随着Ar、N2流量比的变化而不同,其实质是渗镀层中ε-Ti2N相、α-Fe相和ε-TiN相的含量不同,随着N2比例的提高,TiN渗镀层颜色由浅黄—黄色—金黄—深黄色变化,金黄色的渗镀层表面硬度最高;最佳Ar、N2流量比参数为8∶1,此时TiN渗镀层表面显微硬度平均值最高,达到了3120 HV0.05。
TiN permeation layer formed on the surface of plain carbon steel Q235 was prepared by using double glow plasma surface alloying technique.The effect of Ar and N2 gas flow ratio on formation of TiN permeation layer was studied and the TiN permeation layer was evaluated from the depth,phase structure,surface morphology,composition,color,and microhardness.The results show that Ar and N2 flow ratio has little effect on depth of TiN permeation layer.As Ar and N2 flow ratio decreases,the crystallographic preferential growth direction(200) converted into direction(111).The surface morphology of TiN permeation layer is cellular shape under different gas flow ratio,but as Ar and N2 flow ratio decreases,the relief of the cellular structure becomes more obvious,TiN permeation layers become more compact,surface hardness is relatively high.When Ar and N2 flow ratio is 8∶1,the surface Ti and N atomic ratio in TiN permeation layer is close to 1∶1.The color of TiN permeation layer changes along with the gas flow ratio because of different contents of ε-Ti2N phase,α-Fe phase and ε-TiN phase essentially.As Ar and N2 flow ratio increases,the colour of TiN permeation layer changes from light yellow to yellow,then to golden yellow,at last to deep yellow.The golden yellow TiN permeation layer has the best microhardness.When Ar and N2 flow ratio is 8∶1,TiN permeation layer has the best average surface microhardness,3120 HV0.05,and the layer is the best one in all aspects.
出处
《金属热处理》
CAS
CSCD
北大核心
2010年第10期56-59,共4页
Heat Treatment of Metals
基金
国家自然科学基金(50764002)
信息材料广西重点实验室主任研究课题桂科能(0710908-06-Z)
广西区自然科学基金重点项目(2010GXNSFD013008)
关键词
Q235钢
双层辉光
渗镀
氮化钛
流量比
Q235 steel
double glow
plating and diffusion
TiN
gas flow ratio