Abstract:
The present invention relates to the field of ring travellers for the textile spinning mills. More particularly, the present invention relates to a ring traveller with boronized layer coated. The present invention relates to a method of boronizing of a ring traveller comprising coating of the core with iron borides using a boronizing composition comprising boron source / agent inert fillers, primary and secondary activators coating on the ring traveler by heat treatment.
Abstract:
Disclosed are new boronizing compositions consisting of boron fluoride and boron oxide, borax, or an iron boride. The compositions reduce the heating temperature and time. Further disclosed are methods of boronizing a metal substrate including these compositions, or any combination thereof.
Abstract:
A method for preparing a protective layer (38) on a surface of the substrate (36) that requires a bonding temperature (BT) above a detrimental phase transformation temperature range (28) of the substrate, and then cooling the layer and substrate without cracking the layer or detrimentally transforming the substrate. The protective layer (38) and the substrate (36) are cooled from the bonding temperature (BT) to a temperature (46) above the detrimental phase transformation range (28) at a first cooling rate (30) slow enough to avoid cracking the protective layer. Next, the protective layer and the substrate are cooled to a temperature below the detrimental phase transformation range of the substrate at a second cooling rate (27) fast enough to pass the detrimental phase transformation range before a substantial transformation of the substrate into the detrimental phase can occur.
Abstract:
A substrate (12) such as a superalloy turbine component is coated with a basecoat (14) of the type MCrAIY which also contains boron, where the amount of boron in the basecoat is in a concentration gradient where more boron is present near the top (16) than the bottom (20) of the basecoat (14) and boron is present in an average amount of over 0.50 wt.% throughout the basecoat cross-section (14) of the composite (10).
Abstract:
A substrate (12) such as a superalloy turbine component is coated with a basecoat (14) of the type MCrAIY which also contains boron, where the amount of boron in the basecoat is in a concentration gradient where more boron is present near the top (16) than the bottom (20) of the basecoat (14) and boron is present in an average amount of over 0.50 wt.% throughout the basecoat cross-section (14) of the composite (10).
Abstract:
A process comprising: - placing a boronizing powder composition in a metal pipe comprising a first end, a second end, an inside surface and an outside surface; - heating the pipe to form a borided layer on the inside surface, and spent boronizing powder; - removing the spent boronizing powder from the pipe, thereby forming an empty boronized pipe; - heating the empty boronized pipe to above its austenitizing temperature, thereby forming an austenitized pipe; - quenching the austenitized pipe, thereby forming a quenched pipe; - tempering the quenched pipe, thereby forming a tempered pipe; and - threading the tempered pipe.
Abstract:
A powder boronizing composition comprising: a. 0.5 to 4.5 wt% of a boron source selected from B4C, amorphous boron, calcium hexaboride, borax or mixtures thereof; b. 45.5 to 88.5 wt% of a diluent selected from SiC, alumina or mixtures thereof; c. 1.0 to 20.0 wt% of an activator selected from KBF4, ammonia chloride, cryolite or mixtures thereof; and d. 10.0 to 30.0 wt% of a sintering reduction agent selected from carbon black, graphite or mixtures thereof.
Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung eines Bauteils (1) aus einem niedriglegierten Stahlwerkstoff, das zumindest in einem lokal begrenzten Bereich einem Druck und einem Verschleiß ausgesetzt wird, mit folgenden Verfahrensschritten: a) Spanabhebende Fertigung des Bauteils (1) in einem nicht wärmebehandelten Zustand, b) lokales Bedecken des Bauteils (1) mit einem im Wesentlichen entweder Bor oder Chrom aufweisenden Pulver (2), c) Wärmebehandlung des lokal mit Pulver (2) bedeckten Bauteils (1) zur lokal begrenzten Diffusion entweder von Boratomen aus dem Bor aufweisenden Pulver oder von Chromatomen aus dem Chrom aufweisenden Pulver (2) in die Randschicht des Bauteils (1) bei einer ersten Temperatur, die größer als die Austenitisierungstemperatur des niedriglegierten Stahlwerkstoffs ist, d) Abkühlung des Bauteils (1) auf Raumtemperatur und Entfernung des Pulvers (2), und e) erneute Wärmebehandlung des Bauteils (1) zur Einstellung entweder eines martensitischen oder eines bainitischen Gefüges (4) bei einer zweiten Temperatur, die geringer ist als die erste Temperatur.
Abstract:
A laying pipe (28) for use in the laying head of a rolling mill is configured for rotation about an axis, with an entry end aligned on that axis to receive a hot rolled product (P), and with a curved section leading to a delivery end spaced radially from that axis. The curved section defines a guide path configured to form the hot rolled product (P) into a helical formation of rings. The laying pipe (28) comprises a tubular metal wall (34) having an exterior surface and an interior surface against which the hot rolled product (P) is confined for movement along the guide path. At least one of the interior and exterior surfaces of the tubular metal wall (34) comprises a wear resistant boronized layer (36).
Abstract:
The invention relates to a boron containing paste with B4C, SiC, NaF, for coating of metal components to obtain protective layer(s) on the metal by heating, comprising B4C, SiC, NaF, (NH2)2CO, RECl, active carbon and a binder solution which provides the paste consistence. In addition, the paste is self-protective, which means that there is no need for protecting or reducing atmosphere during boronizing, and this makes the process easy and cheap. The invention also relates to applications of boron containing paste. Boronizing with the paste according to the invention can be applied for steel and cast iron, for Ni and its alloys, and for Co and its alloys.