Infiltrated Metal Matrix Drill Bits for Erosion Resistance
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Solution Overview
Problem
Existing subterranean drill bits lack a combination of good erosion resistance, reasonable strength, and good thermal stability, which are essential for specific drilling applications.
Innovation Solution
The development of subterranean drill bits featuring a bit body with an infiltrated metal matrix composed of a specific powder mixture, including 30 to 90 weight percent of cast tungsten carbide, 10 to 70 weight percent of macrocrystalline, carburized, or cemented tungsten carbide, and up to 12 weight percent of transition or main group metals, optimized for particle size distribution to enhance thermal stability, toughness, and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional infiltrated metal matrices are used in drill bits, then manufacturing is simplified, but erosion resistance and thermal stability are insufficient
Solution Approach 1:
The patent uses a composite metal matrix consisting of multiple components: tungsten carbide particles (3-15 wt%), cobalt powder (8-20 wt%), nickel powder (5-15 wt%), and iron powder (5-15 wt%). This multi-material composite structure provides both the erosion resistance from hard tungsten carbide particles and the thermal stability from the combination of binder metals, while still allowing infiltration manufacturing
2Reliability
If harder materials are used to improve erosion resistance, then erosion resistance increases, but toughness and strength decrease
Solution Approach 1:
The matrix combines hard tungsten carbide particles (providing erosion resistance) with a binder system of cobalt, nickel, and iron powders (providing toughness and strength). The cobalt content of 8-20 wt% specifically enhances bonding strength while the nickel and iron contribute to overall matrix integrity, creating a balanced composite that achieves both hardness and toughness
Solution Approach 2:
The patent creates local quality differentiation by distributing hard tungsten carbide particles throughout a ductile metal binder matrix. The binder metals (cobalt, nickel, iron) provide local ductility and toughness in regions between the hard particles, allowing the material to absorb impact energy while maintaining surface hardness for erosion resistance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The drill bits exhibit improved erosion resistance, strength, and thermal stability, as demonstrated by higher transverse rupture strength and erosion resistance compared to comparative samples, while maintaining reasonable toughness and durability.
Implementation Method 1
The bit bodies are typically formed by positioning the cutting elements within a graphite mold, filling the mold with a matrix powder mixture, and then infiltrating the matrix powder mixture with an infiltrant metal.
Data Source
AI summary
Subterranean drill bits having good erosion resistance, strength, toughness, and thermal stability are disclosed. The drill bits comprise a bit body carrying at least one cutting element and having an infiltrated metal matrix. The infiltrated metal matrix comprises a matrix powder composition bound together by an infiltrant. The matrix powder mixture includes cast tungsten carbide powder having a particle size of −30 (600 micron) +140 mesh (106 micron), a second component powder consisting of one or more other types of tungsten carbide particles, and a metal powder.