摘要:
A semiconductor die attach composition with greater than 60% metal volume after thermal reaction having: (a) 80-99 wt% of a mixture of metal particles comprising 30-70 wt% of a lead-free low melting point (LMP) particle composition comprising at least one LMP metal Y that melts below a temperature Tl, and 25-70 wt% of a high melting point (HMP) particle composition comprising at least one metallic element M that is reactive with the at least one LMP metal Y at a process temperature Tl, wherein the ratio of wt% of M to wt% of Y is at least 1.0; (b) 0-30 wt% of a metal powder additive A; and (c) a fluxing vehicle having a volatile portion, and not more than 50 wt% of a non-volatile portion.
摘要:
A gas-shielded flux cored welding electrode comprises a ferrous metal sheath and a core within the sheath enclosing core ingredients. The core ingredients and sheath together comprise, in weight percentages based on the total weight of the core ingredients and the sheath: 0.25 to 1.50 manganese; 0.02 to 0.12 carbon; 0.003 to 0.02 boron; 0.2 to 1.5 silicon; 0 to 0.3 molybdenum; at least one of titanium, magnesium, and aluminum, wherein the total content of titanium, magnesium, and aluminum is 0.2 to 2.5; 3 to 12 titanium dioxide; at least one arc stabilizer, where the total content of arc stabilizers is 0.05 to 1.0; no greater than 10 of additional flux system components; remainder iron and incidental impurities.
摘要:
La présente invention porte sur un procédé d'assemblage de deux pièces (12, 14) par brasage, comprenant la formation d'un joint de liaison (13) entre deux surfaces de liaison (12a, 14a) et un congé de raccordement (15), le procédé est caractérisé par le fait que la composition du métal d'apport pour la formation du congé de raccordement (15) est différente de celle du joint de liaison (13), de manière à présenter une ductilité qui lui est supérieure. L'invention s'applique en particulier à la réalisation de secteurs de redresseur de compresseur à haute pression d'une turbomachine.
摘要:
A polycrystalline diamond (PCD) composite compact element 100 comprising a substrate 130, a PCD structure 120 bonded to the substrate 130, and a bond material in the form of a bond layer 140 bonding the PCD structure 120 to the substrate 130; the PCD structure 120 being thermally stable and having a mean Young's modulus of at least about 800 GPa, the PCD structure 120 having an interstitial mean free path of at least about 0.05 microns and at most about 1.5 microns; the standard deviation of the mean free path being at least about 0.05 microns and at most about 1.5 microns. Embodiments of the PCD composite compact element may be for a tool for cutting, milling, grinding, drilling, earth boring, rock drilling or other abrasive applications, such as the cutting and machining of metal.
摘要:
The exposed metal tip (19) of the strike end (18) of an SMAW welding electrode (10) is covered with a protective coating (22) formed from a binder and metal particles. Because metal particles rather than graphite particles are used to provide electrical conductivity to this protective coating, flare-up of the arc when initially struck is eliminated substantially completely. In addition, the potential for weld porosity problems is also eliminated, because the metal particles of the inventive electrode do not produce C02as a reaction by-product which can ultimately lead to improper welding technique.
摘要:
Invention compositions are a replacement for high melting temperature solder pastes and preforms in high operating temperature and step-soldering applications. In the use of the invention, a mixture of metallic powders reacts below 350 degrees C to form a dense metallic joint that does not remelt at the original process temperature.
摘要:
Provided are metal structures and methods of forming such structures for use in oil, gas and/or petrochemical applications that are joined with non- ferrous weld metal compositions or a high alloy weld metal compositions. The welded metal structures include two or more segments of ferrous or non-ferrous components, and fusion welds, friction stir welds or a combination thereof bonding adjacent segments of the components together, wherein the welds comprise a non-ferrous weld metal composition or a high alloy weld metal composition that is substantially different from the metal composition of the two or more components. The resultant welded structures exhibit improvements in fatigue resistance, toughness, strain capacity, strength, stress corrosion cracking resistance, and hydrogen embrittlement resistance compared to traditional iron- based weld compositions. The structures and methods of forming such structures are advantageous in joining metal components in applications for natural gas transportation and storage, oil and gas well completion and production, and oil and gas refinery and chemical plants.