4 results about "Wear debris" patented technology

The application discloses a self-lubricating sliding bearing, and relates to the technical fields of mechanical transmission and sliding bearing, which comprises a bearing sleeve, a bearing inner sleeve arranged in the bearing sleeve, a liquid exchange space formed between the bearing inner sleeve and the bearing sleeve, a central rotating shaft arranged in the bearing inner sleeve, and a plurality of liquid guide grooves arranged on one side of the bearing inner sleeve close to the bearing sleeve. The self-lubricating sliding bearing realizes stable storage of lubricating liquid and controllable flow under pressure driving through cooperation of the liquid guide grooves arranged on the bearing inner sleeve and the first and second convex point groove structures with the upper part being wide and the lower part being narrow, effectively prevents liquid leakage, and utilizes liquid adsorption and removal of wear debris generated by the central rotating shaft in the rotating process, so that the problems of wear aggravation and channel blockage caused by debris accumulation in the prior art are solved.

This utility model discloses a wear resistance testing device for diamond composite materials, including a wear resistance testing frame. A horizontal plate is fixedly connected to the lower end of the wear resistance testing frame, and a testing chamber is provided at the upper end of the horizontal plate. It also includes a collection mechanism. The collection mechanism includes a lower collection hopper, an upper collection hopper, guide columns, a sliding plate, an auxiliary plate, and a collection chamber. The lower collection hopper is fixedly connected to the inside of the wear resistance testing frame, and a uniformly distributed filter screen is provided at the lower end of the lower collection hopper. Guide columns are fixedly connected to the four corners of the wear resistance testing frame, and a sliding plate is slidably connected to the upper end of the four guide columns. The lower end of the sliding plate is fixedly connected to the upper end of the upper collection hopper through symmetrically distributed support columns. This wear resistance testing device for diamond composite materials, by forming a small collection space with the upper and lower collection hoppers, facilitates the rapid collection of wear debris, greatly improving the accuracy of wear resistance testing for diamond composite materials.

This invention discloses a method for detecting the volume fraction of W-containing Laves phase in a sample, belonging to the field of metallic material testing technology. This invention provides a method for intuitively detecting the volume fraction of W-containing Laves phase in steel. The laser-clad sample containing the W-containing Laves phase undergoes surface pretreatment to remove surface oxide scale and processing burrs. Ultrasonic cleaning thoroughly removes residual oil, wear debris, and other impurities from the sample surface. High-temperature heat treatment makes the previously difficult-to-distinguish W-containing Laves phase clearly visible. Fine processing of the detection surface ensures a smooth and flat surface, providing a clear observation interface for microscopic morphology observation and compositional analysis. After sample characterization, EDS energy dispersive spectroscopy is used to obtain elemental distribution characteristics. Quantitative calculations are performed on the unoxidized areas of the sample to obtain the volume fraction of the W-containing Laves phase. This provides important data support for material composition design, heat treatment process optimization, service life assessment, failure analysis, and mechanism analysis.

This invention provides a gradient silicon nitride ceramic femoral head prosthesis and its preparation method, relating to the technical fields of clinical medicine and biomaterials. The femoral head prosthesis is prepared from 88-94 parts of silicon nitride powder, 4-12 parts of sintering aid, 5-20 parts of tungsten carbide titanium, and 0-30 parts of pore-forming agent, wherein the pore-forming agent cannot be 0 parts. The gradient silicon nitride ceramic femoral head prosthesis of this invention retains the advantages of silicon nitride ceramics—low wear, low friction, high strength, high fracture toughness, and good chemical stability—at the interface between the femoral head prosthesis and the liner, while reducing wear on the titanium alloy femoral stem cone caused by the large hardness difference between the femoral head prosthesis and the liner. This reduces the incidence of organ toxicity, periprosthetic osteolysis, and aseptic loosening caused by metal wear debris, improves the survival rate of the femoral head prosthesis and the femoral stem cone, reduces the revision rate of replacement surgery, and saves patients' treatment costs.