5 results about "Full density" patented technology

A method (100) of obtaining a full-density sintered titanium component can include providing (110) a titanium component having a starting density of 92% or less. The titanium component can be heated to and held at a sintering temperature (120) under a sintering atmosphere containing hydrogen with a pressure during sintering less than 0.2 MPa. This can sinter (130) the titanium component to greater than 92% theoretical density forming a sintered component. The sintered component can be held (140) at a densification temperature while applying a gaseous pressure of 0.2 MPa to 100 MPa with a densification atmosphere, to hot isostatically press (HIP) the sintered component to full density having greater than 99.5% relative density to form the full-density sintered titanium component.

Disclosed herein is a method of consolidating by liquid phae sintering a new class of designed-microstructure particulate material with unprecedented combinations of property extremes called Tough-Coated Hard Powders (TCHPs). The method generally comprises providing a plurality of core particles, wherein the core particles comprise a core material of a first compound; providing an intermediate layer on a majority of the core particles, the intermediate layer comprising a second compound, different in composition from the first compound and having a higher relative fracture toughness, the second compound being capable of bonding with the first compound and being capable of bounding with a metal chosen from iron, cobalt, nickel, copper, titanium, aluminium, magnesiu, lithium, beryllium, silver, gold, and platinum and their mixtures, thereby forming coated particles; and applying an outer layer to the coated particles, the outer layer comprising a metal chosen from iron, cobalt, nickel, and their mixtures to form a substantially continuous outer layer on said intermediate layer, thereby forming component particles of the particulate material; shapping a plurality of the component particles into an article; and sintering the articles to substantialy full density without significant external pressure at a temperature sufficient to liquefy and portion of the outer layer, and for a time sufficient to liquefy a portion of the intermediate layer. The disclosed method leads to sintered particulate materials that may be individually coated with nanolayers of a metal compound having a relatively higher fracture toughness, such a WC or TaC. These coated particles may be additinally coated with a second layer comprising a binder metal, such as Co or Ni. This unique material resuls in multiproperty alloys within the TCHP sintered structure, thus allowing for a combination of normally conflicting performance extremes, including, but not limited to toughness, abrasiveness, chemical wear resistance, and light weight, at levels heretofore unseen in the powder metallurgical art.

The application discloses a kind of electrolyte quick preparation method, comprising the following steps: S1, determine the density of high-density acid used at standard temperature;S2, determine the density of low-density acid to be prepared at standard temperature;S3, table look-up determines the corresponding percentage content of sulfuric acid of two densities;S4, the required amount is calculated using the principle of equal amount of pure acid;S5, different density and amount of table preparation.The application establishes the standardization process of "table look-up-computation-table look-up", combines the double protection of mass conservation law and authoritative data table, shortens the electrolyte preparation time by more than 80%, controls the concentration error within ±0.5%, and with the help of gradient proportioning table covering the full density range of 1.20-1.30g / cm3, fundamentally solves the technical problem that precision and efficiency are difficult to balance in the electrolyte preparation process of lead-acid battery industry, and meets the flexibility requirements of laboratory research and development and the batch requirements of industrial production.

The invention discloses a copper-tungsten electric contact material and a preparation method thereof. Firstly, the surface of tungsten powder is modified, a high-activity interface is constructed on the particle surface through cleaning, coarsening and activating cooperative treatment, and it is ensured that a metal nickel layer and a tungsten matrix are firmly combined in the atomic scale. And then the nickel-plated tungsten powder is converted into high-purity spherical particles by adopting an impurity-free sintering granulation technology, and the high-purity spherical particles are pressed into a self-supporting tungsten-nickel framework. And the skeleton and the copper sheet are infiltrated at a high temperature to form a copper-tungsten contact material which is close to full compactness. The tungsten powder of the nickel transition layer not only strengthens the mechanical stability of the framework, but also fundamentally optimizes the wetting behavior of the copper / tungsten interface, and reduces the defects of infiltration micropores. The prepared copper-tungsten contact has ultrahigh conductivity and excellent arc erosion resistance, and a reform material solution is provided for the field of high-end electric contact.

The invention discloses a single tungsten-rich phase tungsten-titanium alloy and a preparation method thereof. According to the method, W powder and Ti powder serve as raw materials and are sequentially subjected to the steps of mixing, cold isostatic pressing, vacuum hot degassing, hot isostatic pressing and high-temperature treatment, and finally the single tungsten-phase-rich tungsten-titanium alloy is obtained. According to the method, the tungsten-titanium mixed powder is subjected to cold isostatic pressing, vacuum hot degassing and hot isostatic pressing treatment, and the fully-compact tungsten-titanium alloy with the evenly-distributed structure is obtained; then through high-temperature treatment, the diffusion degree of tungsten and titanium is improved, and the microscopic structure is regulated and controlled; and finally, the tungsten-titanium alloy with a single tungsten-rich phase microscopic structure, full compactness, equiaxial crystal grains and uniform size distribution is obtained.