14:41, 14 June 2022

New Aircraft Structures Production Technology has Increased Their Strength

Scientists from NUST MISIS have developed a method of producing composite parts for the aerospace industry, which has increased the strength of finished products by 15% due to a combination of laser technologies and isostatic pressing. The results of the study have been published in The International Journal of Advanced Manufacturing Technology.

The titanium-silicon composite material has unique mechanical properties necessary for the creation of air and land transport — high tensile strength and stiffness. Parts made of such composites are in demand by the aerospace industry.

The properties of this fiber composite are highly dependent on a fairly complex manufacturing technology, which implies a number of significant limitations. Due to the high chemical activity of titanium, the liquid state manufacturing methods are not applicable for the fabrication of titanium-silicone composites.

The research team of the NUST MISIS Hybrid Additive Technologies Laboratory offered a solution to the problem — a hybrid approach combining laser technology and hot pressing.

“The hybrid approach combining the laser powder bed fusion and encapsulated hot isostatic pressing was applied for the elaboration of composite part consisting of titanium alloy matrix reinforced by silicon carbide fibers,” said Andrey Travyanov, co-author of the development, a leading expert of the NUST MISIS Hybrid Additive Technologies Laboratory, the method assumes that the fibers can be placed in the matrix after the manufacture of a single element. After that, the part with the final shape could be assembled using the single elements. The consolidation of the final part can be performed by hot isostatic pressing. The high pressure and temperature will induce the shrinkage of the gaps between the matrix and fiber and promote the diffusion joining of matrix elements. Further insertion of fibers and assembling of several single elements permits the production of the preform with uniform distribution of fibers in the volume."

According to the developers, feasibility of the proposed approach was experimentally confirmed. As a result, the fiber-reinforced titanium alloy parts with a volume fraction of fibers equal to 17% were successfully manufactured.X-ray tomography revealed the absence of defects in the obtained part and a good contact between the matrix and the fibers.

Tests for three-point bending showed that the composite part created according to the new technology has significantly higher — up to 15% — strength and stiffness indicators than the part made of a massive titanium alloy.

Currently, the scientific group is working to optimize the technology and expand the range of manufactured parts.

New on the topic

MMK launches production of unique Russian flat steel with innovative coating

Magnitogorsk Iron and Steel Works (PJSC MMK) has launched the production of flat steel products featuring an innovative corrosion-resistant coating based on a zinc-aluminum-magnesium (Zn-Al-Mg) all...

11 July, 14:07

How service steel centers support the development of Russian industry

In recent years, the Russian metal processing market has shown steady growth, largely driven by the need for technological sovereignty, active import substitution, and the adoption of modern manufacturing t...

04 July, 14:59

Severstal’s Grani and Grani Pro sheet pile solutions receive international recognition

The Grani and Grani Pro sheet pile solutions developed by Severstal have received an award at the international competition Green Eurasia. The award ceremony took place on June 26 in M...

03 July, 13:38

China Increases Steel Exports to Russia

Amid weak domestic demand, China is ramping up its steel exports — including to Russia. In the first five months of the year, exports of iron, steel, and related products to Russia grew by approximately 16% in value terms, compared to an increas...

26 June, 14:09
Subscription to newsletter