A tool with a through hole includes a base and a diamond component held by the base, and when the length of the diamond component along a center line of the through hole is denoted as L1 and the maximum value of a diameter of a circle having the same area as a region surrounded by an outer edge of the diamond component in a cross section having the center line as a normal line is denoted as M1, the ratio L1/M1 between L1 and M1 is 0.8 or more.

A wear-resistant tool includes composite polycrystalline diamond as a core, the composite polycrystalline diamond being composed of polycrystalline diamond in which particulate diamond is directly bonded and non diamond carbon. The polycrystalline diamond in the composite polycrystalline diamond is three-dimensionally continuous in composite polycrystal and primary particles have an average particle size from 10 to 500 nm.

Provided are a high-strength bead wire and a method of manufacturing the same. The method includes preparing a wire rod containing 0.86% to 1.02% by weight of carbon, applying 5 g/m.sup.2 to 10 g/m.sup.2 of phosphate coating onto the surface of the wire rod, and drawing the wire rod onto which the phosphate coating is applied. In the drawing, the wire rod is drawn by a drawing apparatus including a drawing die capable of drawing the wire rod and a pressure die installed in front of the drawing die and capable of applying pressure to the wire rod. The diameter of the pressure die is 1.05 times to 1.20 times the diameter of the drawing die. The high-strength bead wire includes a wire rod containing 0.86% to 1.02% by weight of carbon and 5 g/m.sup.2 to 10 g/m.sup.2 of the phosphate coating applied onto the surface of the wire rod and is manufactured by the above-described method.

A diamond die includes a diamond provided with a hole for drawing a wire material, the diamond being a CVD single-crystal diamond, an axis of the hole being inclined relative to a normal direction of a crystal plane of the diamond.

A diamond die includes a diamond provided with a hole for drawing a wire material, the diamond being a CVD single-crystal diamond, an axis of the hole being inclined relative to a normal direction of a crystal plane of the diamond.

A platinum-based material element wire is coated with gold or gold alloy, and drawing-processed with a carbon-containing die. The thin wire manufactured in this manner is covered with gold or gold alloy, and the coverage of gold or gold alloy is 40% or more on an area basis. The thin wire formed of a platinum-based material is manufactured in a state of suppressing breakage in a drawing processing step, and has favorable performance in electric properties and the like. In addition, this manufacturing process is capable of efficiently manufacturing a platinum-based material thin wire while suppressing breakage when the thin wire is manufactured by drawing processing.

A wire (10) is disclosed. Said wire (10), when viewed in cross-section, has at least one first portion (12) and at least one second portion (14) that are interconnected by a third portion (16) in which the wire (10) has a reduced cross-section.

Embodiments of the invention relate to polycrystalline diamond (PCD) exhibiting enhanced diamond-to-diamond bonding. In an embodiment, PCD includes a plurality of diamond grains defining a plurality of interstitial regions. A metal-solvent catalyst occupies at least a portion of the plurality of interstitial regions. The plurality of diamond grains and the metal-solvent catalyst collectively exhibit a coercivity of about 115 Oersteds (Oe) or more and a specific magnetic saturation of about 15 Gauss.Math.cm.sup.3/grams (G.Math.cm.sup.3/g) or less. Other embodiments are directed to polycrystalline diamond compacts (PDCs) employing such PCD, methods of forming PCD and PDCs, and various applications for such PCD and PDCs in rotary drill bits, bearing apparatuses, and wire-drawing dies.

A shaped diamond die includes a polycrystalline diamond, the polycrystalline diamond having a machining hole, wherein a length D of a side of the machining hole is 100 m or less, a corner R is 20 m or less, the shaped diamond die includes a bearing portion, a surface roughness Sa of the bearing portion is 0.05 m or less, and an average grain size of the polycrystalline diamond is 500 nm or less.

A wire-drawing method comprises providing a rod comprising a wrapped sheet, wherein the sheet comprises a plurality of copper layers and a plurality of graphene layers; extracting an inner layer of the wrapped sheet from the rod to form a spiral; and forming a wire by feeding the spiral through an opening of a die unit.