Near-net-shape forming method of refractory metal part
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A near-net-shaping, refractory metal technology, applied in the direction of improving process efficiency and improving energy efficiency, can solve problems such as inability to form directly, low density of parts blanks, and difficult process control, etc., to achieve dense filling and forming It is beneficial to powder alloying and broadens the application field
Inactive Publication Date: 2012-11-14
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF6 Cites 15 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0005] (1) Powder metallurgy liquid phase sintering method is difficult to directly form parts with arbitrary complex shapes
In the application of refractory materials, if a certain complex shape is required, the powder metallurgy liquid phase sintering method cannot be directly formed due to the limitation of the process
In actual production, mechanical processing and follow-up processing are often required. This method is not only cumbersome, low production efficiency, but also causes waste of materials.
[0006] (2) The powder metallurgy liquid phase sintering method needs to use a mold for forming, and the parts need to be removed from the mold after the processing is completed. Therefore, the design of the mold and the control of the sintering process are very imp...
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Examples
Experimental program
Comparison scheme
Effect test
example 1
[0043] (1) Use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the refractory part, then process it with the slicing software and save it as an STL file, and input the data information of the STL file into the SLM rapid prototyping system.
[0044] (2) Spread a layer of W-Ni mixed powder with a thickness of about 0.02~0.2mm on the metal substrate by the powder feeding mechanism (where the W mass fraction is ≥80%, and the particle size is about 10~100μm).
[0045] (3) Use a YAG laser or fiber laser with a laser power of 200W to scan the slice after selecting the scanning path to melt the refractory mixed metal powder, and the scanning speed is 100~300mm / s.
[0046] (4) Repeat the above steps (2)-(3) until the shell processing of the entire part is completed. At this time, the SLM processing of the W-Ni refractory metal complex metal parts is completed.
[0047] (5) Finally, follow-up processing (such as polishing, infiltration, etc.) is performed on...
example 2
[0049] (1) Use 3D modeling software (such as UG, Pro / E, etc.) to design the CAD 3D model of the refractory part, then process it with the slicing software and save it as an STL file, and input the data information of the STL file into the SLM rapid prototyping system.
[0050] (2) Spread a layer of tungsten powder with a thickness of about 0.05~0.15mm (particle size about 10~100μm) on the metal substrate by the powder feeding mechanism.
[0051] (3) Use a YAG laser or a fiber laser with a laser power of 200W to scan the slice after selecting the processing path to melt the tungsten powder, and the scanning speed is 50~1000mm / s.
[0052] (4) Repeat steps (2)-(3) until the tungsten metal parts with a certain complex shape are processed.
[0053] (5) After processing the obtained tungsten metal parts with complex shapes through mechanical polishing and other steps, pure tungsten refractory metal parts with certain complex shapes and sizes can be obtained.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Property
Measurement
Unit
Particle size
aaaaa
aaaaa
Login to view more
Abstract
The invention discloses a near-net-shape forming method of a refractory metal part, aiming at solving the complexity and the time consumption of a PM (power metallurgy) molding mode, and compensating the technical defect that the comprehensive property of an alloy cannot brought into play completely due to the fact that an SLM (selective laser melting) method liquid phase quantity cannot achieve the technical index of 30-35Vol/% of the densification. The method provided by the invention is as follows: 1, three-dimensional modeling software is adopted to design a CAD (computer-aided design) of a part, subsequently multiple layer slicing information is generated by slicing processing software, and an STL (Standard Template Library) file is stored, and the data of the STL file is transmitted to an SLM rapid molding system; 2, a layer of metal powder to be machined (the thickness ranges from 0.02-0.2mm, and the particle diameter is about 10-100 micrometer) is paved on a working platform by a powder conveying mechanism; 3, an optical fiber laser is adopted to scan the slicing, and the metal powder to be machined paved in the step 2 is completely melted, wherein the scanning speed is 50-1000mm/s; and 4, the steps (2) and (3) are repeated till the whole part machining is ended. The method has the beneficial effects that the powder is subjected to alloying, the bonding property of the alloy is improved, thereby being beneficial for the filling and the molding densification of the liquid, and improving the comprehensive property of the alloy.
Description
technical field [0001] The invention belongs to the field of rapid prototyping technology and powder sintering composite forming, in particular to a method for near-net-shaped refractory metal parts. Background technique [0002] Refractory material is a pure metal or alloy material composed of tungsten, molybdenum and other refractory metals or some other elements. Compared with traditional alloy materials, the typical characteristics of refractory materials are high melting point, usually around 3000°C, so it is difficult to cast and smelt, and powder metallurgy is often used for processing. In recent years, refractory material parts have been widely used due to their excellent properties; taking tungsten-based alloys as an example, they have the following excellent properties, such as high density, good tensile strength, good ductility, and good radiation absorption ability, good electrical conductivity, thermal conductivity and low thermal expansion coefficient, good co...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more