Metal boride ceramic composites and uses thereof
Disclosed herein are compounds, methods, and tools which comprise composite matrices of tungsten tetraborides and ceramics.
1 . A composite matrix of a formula (W 1-x M x B 4 ) z (Q) n , wherein:
the composite matrix comprises a first component comprising crystalline W 1-x M x B 4 and a second component comprising one or more ceramics Q;
the first component and the second component are uniformly dispersed within the composite matrix;
M is one or more of titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), zirconium (Zr), niobium (Nb), molybdenum (Mo), ruthenium (Ru), hafnium (Hf), tantalum (Ta), rhenium (Re), osmium (Os), iridium (Ir), lithium (Li), yttrium (Y) and aluminum (Al);
x is from 0 to 0.999, wherein if x is 0 then M is absent;
each of the one or more ceramics comprises at least two elements, and at least one of the two elements is B (boron), C (carbon), Si (silicon), N (nitrogen), or O (oxygen);
z is a volume percent from 0.1% to 99.9%;
n is a volume percent from 0.1% to 99.9%;
a sum of n and z is 100%;
Q is not tungsten carbide (WC); and
Palmquist Toughness of the composite matrix is from 1-10 MPam 1/2 .
2 . The composite matrix of claim 1 , wherein W 1-x M x B 4 is a crystalline solid characterized by at least one X-ray diffraction pattern reflection at 2 theta=24.2±0.3.
3 . The composite matrix of claim 1 , wherein x is 0.001 to 0.6.
4 . The composite matrix of claim 1 , wherein M is one or more of Cr, Ta, Mo, or Mn.
5 . The composite matrix of claim 1 , wherein M is Cr; Mn; Mo; Ta and Cr; or Ta and Mo.
6 . The composite matrix of claim 1 , wherein the one or more ceramics comprises at least B, C, Si, or N.
7 . The composite matrix of claim 1 , wherein Q is one or more ceramics selected from TiB 2 , SiC, AlC, TiC, and B 4 C.
8 . The composite matrix of claim 1 , wherein n is from 1% to 50%.
9 . The composite matrix of claim 1 , wherein Vicker's Hardness of the composite matrix is from 18-30 GPa measured at 9.8 N (1 kg force load).
10 . The composite matrix of claim 1 , wherein the composite matrix has a density from 3-8 g/cm 3 .
11 . The composite matrix of claim 1 , wherein n is from 5% to 40%.
12 . A method of preparing a composite matrix of claim 1 , the method comprising:
a) blending together crystalline W 1-x M x B 4 or WB 4 with solid Q to form a mixture; wherein:
M is one or more of titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), zirconium (Zr), niobium (Nb), molybdenum (Mo), ruthenium (Ru), hafnium (Hf), tantalum (Ta), rhenium (Re), osmium (Os), iridium (Ir), lithium (Li), yttrium (Y) and aluminum (Al);
x is from 0.001 to 0.999;
Q is one or more ceramics, wherein each of the one or more ceramics comprises at least two elements, and at least one of the two elements is B (boron), C (carbon), Si (silicon), N (nitrogen), or O (oxygen);
z is a volume percent from 0.1% to 99.9%;
n is a volume percent from 0.1% to 99.9%;
the sum of n and z is 100%; and
wherein Q is not WC,
pressing the mixture to generate a pellet,
heating the pellet to produce the composite matrix, and
Palmquist Toughness of the composite matrix is from 1-10 MPam 1/2 .
13 . The method of claim 12 , wherein the mixture is heated to a temperature between about 1050° C. and about 2200° C., wherein the mixture is heated at a ramp rate of between 100-200° C. per minute.
14 . The method of claim 12 , wherein the mixture is heated by a plasma spark sintering, induction furnace, electromagnetic induction, hot pressing, conventional furnace, or fused deposition modeling.
15 . A tool comprising a surface or body for cutting or abrading, wherein the surface or body comprises a composite matrix of claim 1 .
16 . A method of applying a composite matrix of claim 1 , wherein the method comprises affixing the composite matrix to a tool by laser welding or arc welding.
17 . A method of manufacturing a tool comprising a composite matrix of claim 1 , wherein the tool is manufactured by turning, milling, grinding, drilling, Electrical Discharge Manufacturing (EDM), Electrochemical Machining (ECM), water jet cutting, plasma cutting, or laser machining.
18 . A tool, nozzle, or machine part comprising a composite matrix of claim 1 , wherein a lubricating layer of B 2 O 3 forms on a surface of the composite matrix in presence of moisture.
19 . A method of using a nozzle comprising the composite matrix of claim 1 , comprising:
exposing the nozzle comprising the composite matrix to moisture, thereby forming a lubricating layer of B 2 O 3 on a surface of the composite matrix; and
extruding a semisolid, solution, suspension, or liquid through the nozzle.