热压工艺参数对WC–Cu基胎体力学性能的影响

Effect of hot pressing parameters on the mechanical properties of WC–Cu matrix

在深部钻探中,WC–Cu基金刚石钻头胎体被广泛使用。为了提高钻头使用性能,在同一胎体配方下,采用正交试验方案对热压参数进行设计,并烧制试样进行抗弯强度和显微硬度测试。通过方差和极差分析不同烧结温度(A)、烧结压力(B)、保温时间(C)、冷却方式(D)对金刚石钻头胎体力学性能的影响。试验结果表明:对纯胎体和含金刚石胎体抗弯强度影响的顺序为A>D>B>C;对胎体维氏硬度影响的顺序是A>C>B>D。本次正交试验中的最优理论烧结参数为A3B3C1D4,即烧结温度为960℃、烧结压力为16 MPa、保温时间为3 min、冷却方式为400℃保温炉冷。此时,与理论参数最接近的工艺试验结果为:纯胎体抗弯强度为983.33 MPa、硬度为437.40 HV,金刚石胎体试样抗弯强度为525.00 MPa。

WC–Cu based diamond bit matrix is widely used in deep drilling.To improve the service performance of diamond bit,orthogonal experiment method was employed to design the hot pressing parameters of the same matrix formula.Samples were fabricated to test their bending strengths and microhardness,respectively.The effects of sintering temperature A,sintering pressure B,holding time C and cooling type D on the physical properties of diamond bit matrix were studied by variance analysis and range analysis.Results show that the influence on bending strengths of pure matrix and diamond matrix is A>D>B>C,and that the influence on hardness of matrix is A>C>B>D.The best mechanical properties of matrix is obtained under A3B3C1D4,which is at sintering temperature of 960℃,sintering pressure of 16 MPa,holding time of 3 min and cooling mode of 400℃within furnace.At this time,the blending strength of the pure matrix was 983.33 MPa,and its hardness was 437.40 HV,while the blending strength of the diamond matrix was 525.00 MPa.