Brazing Technology

 

GlideR – Brazed-on sliding linings to reduce wear

Short description:

Friction and wear caused by tribological contacts lead to enormous energy consumption every year, thus to high costs and higher CO₂ emissions. As a component that is used in all main energy consumption sectors, the plain bearing thus represents a high potential for energy and cost savings. The tribological stresses on the plain bearing are highly dependent on the bearing design, lubrication and load type. Hydrostatic plain bearings are used to counteract these stresses. However, when using the hydrostatic plain bearing, in addition to the requirement for a minimum speed to separate the contact surfaces, ecological requirements also arise because of the lubricants such as oils and greases. In this respect, dry-running plain bearings prove to be advantageous in comparison to hydrostatic plain bearings with regard to the elimination of lubricants. Nevertheless, bearings made of soft copper-based alloys entail high costs, which are essential for the production of the dry-running plain bearing. In this context, cladding brazing, as a promising coating technology due to good layer adhesion and effective surface protection, offers a good opportunity to manufacture low-cost bearings made of steel with a coating adapted to the tribological application, combined of brazing matrix and integrated solid lubricant. The main objective of the research project is thus to investigate the suitability of application-specific coatings made by means of buildup brazing from different combinations of brazing matrix and solid lubricant for the production of sliding coatings.

Funding:	Industrial Collective Research (IGF)
Porject number:	22.732 N
Duration:	June 01, 2023 to August 31, 2025

 

HEA-Heiz – Development of Novel Metallic Additional Materials for Heating Elements by Thermal Spraying

Short description:

This research project focuses on the investigation of high entropy alloys (HEA) for the application as thermally sprayed heating elements. HEA is a new innovative material class, which gained significant research interest in the last 15 years. By alloying elements with significantly smaller or significantly larger atomic radii the crystal lattice of the reference alloy is distorted to adjust the material properties that way. The metallurgic material development is conducted on alloys, remolten in a vacuum oven, as well as on metallic foils, which are manufactured by melt spinning. The high cooling rates of the alloy during melt spinning are used to emulate the solidification process during thermal spray. Poster HEA-Heiz

Funding:	German Research Foundation (DFG)
Project nubmer:	BO 1979/76-1
Duration:	October 1, 2020 to December 31, 2023

 

Influence of solid-liquid reactions in the brazing gap on joint properties and precision

Short description:

The aim of the project is to reduce the quantity of intermetallic compounds in the brazing seam and the effect of the heat treatment on the base material when joining hot work tool steels with a nickel based filler metal. Thus to improve the mechanical and thermal properties of the joint will be improved. In order to achieve this the grain growth will be reduced by an adapted temperature control and by electric current assisted brazing which results in accelerated and directed diffusion during brazing. Poster SFB 1120 – Teilprojekt A5

Funding:	German Research Foundation (DFG)
Porject number:	SFB 1120 – Project A5
Duration:	July 1, 2022 to June 30, 2026