Focus
Archaeometallurgy involves the compositional analysis of archaeological and other historically and/or artistically significant metal objects. Primary metals and alloys can be identified along with their relative concentrations utilizing XRF. Handheld XRF is ideally suited for in-situ, non-destructive measurements of these valuable objects. This surface analysis can perform major, minor and trace analysis to confirm metal and alloy identification without damaging the material. Such information helps to accurately describe the bulk metal, inlay, plating and/or other coatings. The identity and/or concentration of alloys and metals helps determine the composition, origin, technology, authenticity and value of an archaeometallurgical object, and aids in optimal restoration and preservation. Trace element analysis can help in the discovery of the provenance of an object or the metals it was made of. A series of related objects can be analyzed to learn patterns of alloy and specific metal use. |
Characterization of a Private Bowie Knife CollectionBowie Knives, named after American pioneer James Bowie (1796-1836), became a hunter's mainstay on the early American frontier. Bowies, traditionally 10-15 inch in length, have single-edged steel blades with concave, tapered points and large handles for a firm grip. Although still used for hunting, Bowie Knives are a favorite of collectors for their craftsmanship, decoration, value, and historical significance. |
Early knives were hand forged and are typically heavy, well balanced and have a prominent bolster. Although the production of knives has remained similar for the past 200 years, advances in metallurgy and alloys have helped to fine-tune hardness, durability and finish. Carbon content determines the hardness of the blade, while other metals, such as molybdenum, are selected to produce more specific characteristics, such as toughness, finish and corrosion resistance. A blade's alloy composition determines the optimum time and temperature for production treatments.
Once the blade is completed, it is assembled with the stock, guard and pommel. The stock is typically riveted onto the tang to create a secure, easily gripped handle. The guard and pommel are normally steel or brass, while stocks and grips are made of a variety of materials including nylon, leather, exotic woods or animal bone and horn.
A private Bowie knife collection was characterized for metal and alloy content. The specifications of the Portable XRF used in this study, the data collection techniques, a description of the collection and results of the compositional analysis will be discussed.
Portable XRF Specifications: An Innov-X Handheld XRF analyzer capable of measuring elements from Mg to U, from levels of PPM (Parts per Million) to 100%, was utilized in this study. This hand held XRF analyzer consists of a Tantalum target x-ray tube, 5-40kV, 10-100uA, filters, and a high resolution Si-PiN diode detector. The alloy analysis software mode was utilized.
Data Collection Technique: Handheld XRF does not require any sample preparation. The analyzing head of the analyzer was touched to the knives at key locations, including the blade, cross piece, hilt, and pommel. Each test was 20 seconds long and done in duplicate.
Bowie Knife 1Bowie Knife 1 consists of a steel, curve-end blade that appears to be soldered to the curved crosspiece. The hilt is made of metal and a stone-like material with a carved eagle as the end bolster. This knife was made in Mexico; the name "P. Tirrez" is carved on the blade just above the cross section. Knife weight: 0.75 lbs; Knife length: 12 1/16th in |
| Element | Blade | Cross Piece | Hilt | Hilt Rivets |
| Fe | 99.5 | 15.83 | 5.69 | 96.55 |
| Cr | 0.09 | - | - | - |
| Mn | 0.41 | 0.27 | 0.29 | .23 |
| Ni | - | 1.37 | 1.31 | - |
| Cu | - | 55.17 | 60.25 | - |
| Sn | - | 6.92 | 8.72 | - |
| Pb | - | 4.26 | 5.68 | - |
| Zr | - | - | - | .29 |
| Zn | - | 16.17 | 17.94 | 2.58 |
| Mo | - | - | - | .35 |
| Blade Alloy Match: Carbon Steel | ||||
Bowie Knife 2Bowie Knife 2 consists of a steel, curve-end and split blade. It appears to have a full tang with some splitting of the multi-colored wooden hilt. The crosspiece is rectangular with a high polish similar to the flat end-bolster piece. The "pommel" is a pointed piece of plastic. This knife was made in Pakistan. Knife weight: 13/16 lb; Knife length: 12 14/16ths in |
| Element | Blade | Cross Piece | Flat end-bolster | Pointed "Pommel" |
| Fe | 87.42 | 85.98 | 88.5 | .29 |
| Cr | 11.84 | 12.99 | 11.57 | - |
| Mn | 0.51 | 0.64 | 0.38 | - |
| Ni | 0.23 | 0.25 | - | 67.27 |
| Cu | - | 0.11 | - | 25.54 |
| Sn | - | - | - | .58 |
| Pb | - | - | - | .57 |
| Zr | - | - | - | - |
| Co | - | - | - | - |
| Zn | - | - | - | 3.62 |
| Mo | - | 0.02 | - | - |
| Blade/Cross Piece/Bolster Alloy Match: 410/416/420 | ||||
Bowie Knife 3Bowie Knife 3 is a Tomahawk XL-216 made with "Stainless China": This blade has a curved tip and serrated spine. The oval cross piece is also serrated. It appears to have a full tang with a heavy wooden hilt secured with rivets. It was likely assembled in the United States. Knife weight: 9/16th lb; Knife length: 13 13/26th in; Blade length: 7 9/16th in |
| Element | Blade | Cross Piece | Hilt Rivets |
| Fe | 86.66 | 86.84 | .52 |
| Cr | 12.53 | 12.60 | - |
| Mn | 0.57 | 0.56 | - |
| Ni | - | - | .13 |
| Cu | - | - | 58.97 |
| Zr | - | - | - |
| Pb | - | - | 1.23 |
| Nb | - | - | - |
| Zn | - | - | 39.16 |
| Mo | - | - | - |
| Blade/Cross Piece Alloy Match: 410/416/420
Rivets: CDA 360 | |||
The Innov-X Handheld XRF Analyzer quickly and easily identified the primary metals and alloys along with their relative concentrations for this knife collection. Its utility enabled the characterization of the collection giving pertinent information concerning compositional analysis. Handheld XRF is ideally suited for in-situ, non-destructive measurements of these valuable objects. This surface analysis technique performs major, minor and trace analysis to confirm metal and alloy identification without damaging the object of interest. Such information helps to accurately describe the bulk metal, inlay, plating and/or other coatings of archaeometallurgical objects.
| Common Alloys for Knives | |
| Stainless Steel | Excellent edge; does not discolor; easy to maintain |
| Crucible S30V Steel | Excellent combination of edge retention, flexibility and hardness; easy to sharpen; highly corrosion resistant |
| High-Carbon Steel | Excellent hardness and edge; easy to sharpen |
| High-Carbon Stainless | Excellent corrosion and stain resistance |
| Titanium | Lightweight, durable and retains edge longer than steel; easy to sharpen |
| Ceramic | Remarkable strength, corrosion resistance, edge and thinness for delicate slicing |
| Common Alloy Additives for Knives | |
| Vanadium (23) | Improves hardness and fine grain for wear and rust resistance |
| Chromium (24) | Improves resistance to oxidation |
| Manganese (25) | Improves toughness for wear resistance |
| Nickel (28) | Improves toughness, hardness and corrosion resistance; salt water uses |
| Molybdenum (42) | Improves hardness, tensile strength and corrosion resistance, particularly pitting |
Curios:
Why did David Robert Jones change his name to David Bowie?
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