烧结压力对低液相Fe基预合金钻头胎体性能的影响

王志明; 方小红; 孙武成; 段隆臣; 谭松成; 章文姣

doi:10.13394/j.cnki.jgszz.2022.3007

烧结压力对低液相Fe基预合金钻头胎体性能的影响

doi: 10.13394/j.cnki.jgszz.2022.3007

王志明^{1, 2, 3},
方小红^{1, 2, 3,},
孙武成^{1, 2, 3},
段隆臣^{1, 2, 3},
谭松成^{1, 2, 3},
章文姣⁴

1.
岩土钻掘与防护教育部工程研究中心, 武汉 430074
2.
中国地质大学(武汉) 工程学院, 武汉 430074
3.
科技部地球深部钻探与深地资源开发国际联合研究中心, 武汉 430074
4.
辽宁工业大学土木建筑工程学院, 辽宁锦州121001

基金项目: 国家自然科学基金面上项目（41972327）；岩土钻掘与防护教育部工程研究中心实验室开放基金项目（202106）。

详细信息

作者简介:
方小红，女，1981年生，讲师、博士。主要研究方向：钻头与岩土的相互作用、岩土钻掘材料与机具等。E-mail：346741943@qq.com

中图分类号: TQ164; TG74; TH692.9
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出版历程
- 收稿日期: 2022-07-03
- 修回日期: 2022-08-20
- 录用日期: 2022-09-08
- 刊出日期: 2023-04-20

Effect of sintering pressure on the performance of Fe-based pre-alloyed bit matrix with low liquid phase

WANG Zhiming^{1, 2, 3},
FANG Xiaohong^{1, 2, 3
,},
SUN Wucheng^{1, 2, 3},
DUAN Longchen^{1, 2, 3},
TAN Songcheng^{1, 2, 3},
ZHANG Wenjiao⁴

1.
Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education, Wuhan 430074, China
2.
Faculty of Engineering, China University of Geosciences（Wuhan）, Wuhan 430074, China
3.
National Center for International Research on Deep Earth Drilling and Resource Development, Wuhan 430074, China
4.
Faculty of Civil Construction Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China

摘要

摘要:
在烧结温度为950 ℃、保温时间为5 min及不同烧结压力条件下开展热压烧结试验，对比研究烧结压力对3种低液相Fe基预合金钻头胎体和1种传统Fe基钻头胎体性能的影响，具体包括胎体压入硬度、抗弯强度、致密度和金刚石包镶强度等力学性能，以及金刚石的热损伤情况和钻头胎体的微观组织结构与形貌特征等。结果表明：随着烧结压力增大，低液相空白胎体的压入硬度、抗弯强度和致密度逐渐增大，而传统Fe基空白胎体的压入硬度和抗弯强度呈现先增大后减小的趋势，其致密度为增大趋势；对于含金刚石的胎体，低液相与传统Fe基胎体抗弯强度均随烧结压力增大而增大，当烧结压力为20 MPa时，继续增大压力，低液相含金刚石胎体的抗弯强度趋于稳定，而传统Fe基含金刚石胎体的抗弯强度略有下降。同时，随着烧结压力的增大，低液相胎体的均一性明显增强，但金刚石的热损伤加剧。综合胎体的力学性能与断口形貌特征，优选的烧结压力为20 MPa，此时的低液相Fe基预合金胎体硬度、抗弯强度可满足孕镶金刚石钻头需要。
- 热压烧结 /
- 金刚石钻头 /
- Fe基 /
- 预合金 /
- 低液相
Abstract:
The hot-pressing sintering experiments were carried out under the conditions of sintering temperature of 950 ℃, holding time of 5 mins and different sintering pressures. The effects of sintering pressure on the properties of three kinds of low liquid phase Fe-based pre-alloyed bit matrix and one traditional Fe-based bit matrix were compared and studied, including the hardness, the bending strength, the relative density, the diamond embedding strength of the matrix, the thermal damage of diamond. as well as the microstructure and the morphology of drill bit matrix. The results show that with the increase of sintering pressure, the indentation hardness, the bending strength and the relative density of blank matrix with low liquid phase gradually increase, but the hardness and the bending strength of traditional Fe-based pre-alloyed blank matrix increase at first and then decrease, and the relative density increases. For the matrix containing diamonds, the bending strength of low liquid phase and traditional Fe-based matrix increases with the increase of sintering pressure. When the sintering pressure is 20 MPa, the bending strength of the diamond containing matrix with low liquid phase tends to be stable, while the bending strength of the traditional Fe-based matrix containing diamond decreases slightly. At the same time, with the increase of sintering pressure, the homogeneity of the low liquid phase matrix is enhanced, but the thermal damage of the diamond is gradually aggravated. According to the analysis of the mechanical properties and the fracture morphology of the matrix, the optimal sintering pressure is 20MPa. At this time, the hardness and the bending strength of the low liquid phase Fe-based pre-alloy matrix can meet the requirements of impregnated diamond bits.
- hot pressing sintering /
- diamond drill bit /
- iron-based /
- pre-alloy /
- low liquid phase

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图 1 合金粉末微观形貌

Figure 1. Micromorphology of alloy powders

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图 2 洛氏硬度随烧结压力的变化

Figure 2. Rockwell hardness varies with sintering pressure

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图 3 抗弯强度与强度损失率随烧结压力变化

Figure 3. Bending strength and strength loss rate vary with sintering pressure

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图 4 致密度随烧结压力变化

Figure 4. Relative density varies with sintering pressure

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图 5 2号配方胎体在不同烧结压力下的断口形貌

Figure 5. Fracture morphology of No. 2 formula matrix under different sintering pressures

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图 6 4号配方胎体在不同烧结压力下的断口形貌

Figure 6. Fracture morphology of No. 4 formula matrix under different sintering pressures

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图 7 2号配方胎体在不同烧结压力下的断口金刚石形貌

Figure 7. Fracture diamond morphology of No. 2 formula matrix under different sintering pressures

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图 8 2号配方中金刚石−金属的结合界面

Figure 8. Bonding interface between diamond and metal in formula 2

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表 1 低液相Fe基预合金胎体配方

Table 1. Formula of Fe-based pre-alloyed matrix with low liquid phase

配方编号	质量分数 ω₁ / %			元素质量分数 ω₂ / %
配方编号	FAM1020	FAM2120	FAM3010	Fe	Ni	Cu	Sn	Mn	Co
1	5.5	74.5	20.0	83.92	6.86	4.47	2.24	2.40	0.11
2	26.7	42.7	30.6	82.44	9.51	2.56	1.28	3.67	0.54
3	49.0	15.0	36.0	81.11	12.24	0.90	0.45	4.32	0.98

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表 2 热压金刚石钻头胎体配方中的液相含量分组

Table 2. Grouping of liquid contents in matrix formula of hot-pressed diamond bits

组别	富液相	高液相	低液相
组别	富液相	高液相	中等液相	少量液相	微液相	极微液相
LPC质量分数 ω₃ / %	> 40	（20，40]	（10，20]	（5，10]	（2，5]	≤2

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