China's JSHK makes breakthrough in T1000 carbon fibre development

[Economic superpower]

Jiangsu Hangke Composite Materials Technology’s (JSHK) T1000 carbon fibre has been tested successfully, following the company’s consistent research and development activities.

The product performance indexes including stability appear to be equal to that of the Japanese Toray’s similar products, the company claims.

This is another milestone for the company, after it built the first Chinese domestic production line in 2012, which led to mass production of T800 carbon fibre.

Pilot product
JSHK T1000 carbon fibre pilot production line is in the scale of 50 tons/year. The pilot product has been tested by the third party testing centres, including Beihang University (BUAA) high performance carbon fibre testing and analysis centre, and Beijing University of Chemical Technology (BUCT) Institute of carbon fibre and composites.

According to the company, the results show that the tensile strength, tensile modulus, and elongation linear density, the three main performance indexes of JSHK T1000 carbon fibre experimental products, as well as thermal conductivity and other parameters, are equal to that of Toray T1000 products.

Prior to this, the stability of the product has been the problem area in the Chinese domestic carbon fibre industry for many years, as well as causing trouble for enterprise development. The recent results, however, show that the stability of JSHK T1000 products is at a good level, with the products’ variation coefficient (CV value) said to be at the same level of Toray.

Production and market demand
The precursor used for the carbon fibre production has also been produced by JSHK independently. The T1000 and the T800 are different products made on the same production line, obtained through technology upgrading, yet with the same modulus.

The difference between these products is that the T1000 is stronger, so it can be used in special industry applications, compared to T800, which cannot meet the special needs of such industry sectors.

Despite the fact that JSHK T800 production technology has matured, there is still a high demand for T800 products. The production of T1000, therefore, is expected to evolve when there is an adequate response from the market, JSHK reports.

Carbon fibre development
Reportedly, the company has applied for 85 patents regarding the carbon fibre development, 24 of which have been authorised so far.

In addition, JSHK has developed 20 equipment manufacturing standards, 40 production process standards, 68 tracking test specifications, one T700 enterprise standard and one T800 enterprise standard.

All those works are said to have laid a good technical R&D and industrialisation base for carbon fibre production. It has also accumulated valuable experience for carbon fibre development in China.

 

[Economic superpower]

This is an older article to show how important the opening article is to China's development.

China Increasing Output Of Strong Carbon Fiber
China, making strong carbon fiber, plans more capacity and even higher-quality product

Dec 9, 2013 Bradley Perrett | Aviation Week & Space Technology

The world's strongest carbon fiber is Toray Industries' T100G, says the Japanese manufacturer. Now China, denied access even to lower grades from foreign suppliers, is working on matching it.

China makes a limited volume of T800—a lower-grade but still very strong fiber that it cannot buy from Western countries and Japan—and plans are afoot to build a plant with 20 times the current capacity. These advances could improve the performance of Chinese military aircraft and, eventually, bring China into the global market for aerospace materials, in which it has so far had negligible presence.

The Chinese T800 grade will cost only 1,600 yuan ($262) per kilogram, compared with the 4,200 -yuan-per-kilogram cost of the established and much inferior local product, T300, the plant operator told the China Aeronautical Materials and Manufacturing Equipment Summit, organized by Galleon, in Beijing last week. It is unclear whether it is referring to output from its present facilities or the larger plant.

National aeronautics group Avic has meanwhile described its development work on composite aircraft structures in preparation for the proposed Comac C929 widebody airliner. Technical challenges forced the abandonment of plans to build a composite center wingbox for its C919 narrowbody, Comac said at the summit.

Chinese production of T800 grade carbon fiber is so far only modest. (Credit: Jiangsu Hangre)
The new carbon-fiber plant of Jiangsu Hangke Composite Materials Technology has a capacity of 50 metric tons of T800 carbon fiber a year, plus 100 tons of T700, the company says. A plant with a capacity of 1,000 tons of T800 a year is coming online, with capacity for 50 tons a year of M55J carbon fiber. The country will also work on the T1000 and M60J, which is another higher grade, Jiangsu Hangke says, giving no dates.

The “T” numbers approximately indicate the strength of the fibers, which are impregnated with resin and then baked to create carbon-fiber-reinforced plastic—composite. Toray describes its T1000G as “the world's highest-tensile-strength carbon fiber,” with a rating of 6,370 megapascals (9,239 psi). Jiangsu Hangke says its T800 has a tensile strength of 5,709 megapascals, while Toray rates its T800S fiber at 5,880 megapascals. The advantages to China in using its T800 in military aircraft are obvious from the relatively modest 3,530-megapascal strength of Toray's T300, which has been made for about three decades.

The U.S. and its allies do not export T800 carbon fiber to China, in order to prevent its use in military aircraft there. In May, a Chinese man pleaded guilty in a U.S. court to trying to take Toray T800 from the U.S. to China.

China is surely considering more than military applications for its improved carbon fibers, however. Some of the strongest carbon fiber is also used in civil aircraft. The Chinese industry is presumably looking to the proposed C929 widebody aircraft that Comac wants to build as a follow-on to the C919. And beyond that, it likely has ambitions to supply the global market, as evidenced by Jiangsu Hangke's willingness to discuss the properties of its materials at an open conference. Jiangsu Hangke appears to be associated with the government's Chinese Academy of Sciences.

Comac has chosen only foreign carbon fiber for the C919. But the Chinese industry has not missed out on large sales in that program, because the aircraft will use carbon fiber only in its tail and secondary structures. Until this year, the C919 was supposed to have a composite center wingbox, but the manufacturer switched to aluminum.

The reasons for the switch were partly economic but mostly technical, Comac says. “Mainly, it was related to the level of difficulty of certain technologies and, in the end, the problems were in two areas,” says a company official. “One was thermal conduction; some places [in the structure] were hot, and the composite material, which we chose initially, could not cope with that.” The other problem was dealing with electricity in the structure, whether static or from lightning.

“We have not stopped researching composite center wings,” says the official, referring to the C929. “We will continue this effort.”

Avic has made engineering samples of 12-meter (40-ft.) wing panels, says an official of that group's First Aircraft Institute, a design bureau. One piece, apparently an upper panel, was cured at only 120C (248F) under “vacuum pressure,” reducing costs, says an official. Another piece, apparently a lower panel, was formed with integral stringers that were cured separately before attachment.

The conference also saw photos of a composite aileron made with vacuum-assisted resin injection and a rudder component made using resin-transfer molding. Process improvements have reduced the designing time for large parts to 2-3 months, from 6-8.

Shanghai-based Comac says its largest autoclave has dimensions of 21 X 5.5 meters (70 X 18 ft.) but in Beijing, Avic has one of 30 X 7 meters. Mitsubishi Heavy Industries makes Boeing 787 outer wings in 40-meter autoclaves.

Composite manufacturing is probably profitable to the Chinese state firms, because civil aircraft are not their only market, says an industry official. Chinese military orders are contracted at cost plus an agreed profit, explaining why the suppliers can make money. There is little manufacturing of composites for Chinese civil aircraft: Comac's first one, the ARJ21 regional jet, has only 1.5% composite content. Jiangsu Hangke expects the C929 to reach 25% composite content. Another official makes a similar prediction for the widebody and adds that its wing will be composite. There does not seem to be a plan to build a composite fuselage for the C929, development of which has not been launched.

China's state companies are not yet supplying aerospace aluminum to the global market, although they make the material for Chinese military aircraft and civil aircraft whose certification is not recognized by developed countries. That, too, is about to change, however. Airbus is working to qualify metal from the government's Southwest Aluminum. The material will be conventional aerospace-grade aluminum, not the more recent advanced aluminums or aluminum-lithium, says Antoine Gaugler, Airbus's purchasing manager for Asia. Aleris, a U.S. company, has set up a plant to make conventional aerospace aluminum in eastern China at Zhenjiang (AW&ST May 27, p. 37).

China is also working on ceramic matrix composite (CMC) but lacks practical applications of such material, which remains stable at temperatures that defeat even the best metals used in aircraft engines. Apart from work on parts for turbine engines, Chinese engineers have been applying CMC to ramjets and telemetry systems, says a leading researcher in the field. More than 4,000 articles have been made for 360 types of parts.

“China began work on ceramic matrix composites in the 1990s, several decades after other countries,” the Chinese researcher tells Aviation Week. “We are still behind North America and Europe, and in some areas we have been unable to catch up. In [development of] materials, we have been catching up faster.

“But we are far behind in applying and using the technology,” she says. “Without thorough testing and verification, we cannot believe the characteristics” determined in the laboratory. “In some areas, we have surpassed [foreign researchers], but in applications we are backward.” International experience shows that the cooperation of industry, universities and research institutes is key to success, she adds.

A CMC manufacturing technology national engineering center was approved this year as a base for promoting the industry. Two projects, one applicable to aero-engines and one for brakes, have been given the go-ahead. Among the work discussed at the conference, a CMC afterburner inner cone was tested for 24 hr. A problem in the connection structure was found but fixed. This effort appears to have been judged a success, since the researcher says it “laid a foundation” for engine development.

The Northwestern Polytechnical University at Xian has tested engine nozzle parts between ambient temperature and 820C. In one test, the nozzle of a Klimov RD-33 engine was tested at pressures of 0.28 megapascals, a speed of Mach 1.5, and 1,047C. This test proved the that higher operational temperature was possible, along with a saving in cooling air.

 

[cirr]

Now a complete ban on imports of T800 and T1000 from the US or Japan，should be enforced for the next 10 years。

 

[Bussard Ramjet]

Now a complete ban on imports of T800 and T1000 from the US or Japan，should be enforced for the next 10 years。

As far as I know, US and Japan have already placed a ban on export of these fibres to China.

 

[Beast]

As far as I know, US and Japan have already placed a ban on export of these fibres to China.

Really? Show me.

 

[Bussard Ramjet]

Really? Show me.

It is written in the second article posted above. US and Japan don't sell T800 and above. T1000 is the strongest of fibres.

 

[UKBengali]

Well done China.

 

[DragonEmpire]

This is the crown jewel of Japan's industrial base. Japan has nothing left after this except good optics.

 

[cirr]

As far as I know, US and Japan have already placed a ban on export of these fibres to China.

That's exactly the point.

Now that we have these fibres, similar US and Japan products should be made devoid of the Chinese market,

 

[Bussard Ramjet]

That's exactly the point.

Now that we have these fibres, similar US and Japan products should be made devoid of the Chinese market,

I don't think so. You should play magnanimous, and open up.

As the article mentioned, and as I have full confidence on the skills of Chinese mass production, Foreign entry will never be able to compete against Chinese fibre. But you will have the moral upper hand, you can say, look we are not as crazy and protectionist as you guys. We are the ones believing in trade.

Also, anyways, most likely the markets of US and Japan and the west in general will also open up for China, and it should focus on taking a 60% market share.

 

[seven7seven]

Once again West and Japan deny China technology and they end up doing it on their own anyway. In a way you have to thank them for these kinds of sanctions because if China had to keep relying on the West for hi-tech materials and systems, China would never have developed their own tech and R&D base, that is approaching World class in most critical areas.

West just expects China to be like other banana republics that can't develop anything of worth on their own. West are now learning that China is not only capable but they are faster and more capable than the West. In the coming years, China will surpass US, Japan and Europe in technical developments. The thing China lacked in last few centuries was stability and money, otherwise China would have been on top long ago. The reason for China's turbulence in the last few centuries is, of course, the West and Japan. China is only regaining its rightful place as the Middle Kingdom of the World.

 

[Shotgunner51]

Now a complete ban on imports of T800 and T1000 from the US or Japan，should be enforced for the next 10 years。

The new question now becomes, is China banning T1000 export to hostile countries?

 

[Keel]

Now as the news unfold, we have a much better understanding of how difficult we have been facing throughout our history of technological development and they are still mocking 24/7 about the delays of Comac's commercial airplane programmes so pathetic

Literally we are banned from accessing to their agricultural, space, military, computer .. technologies and all that and still making amazing progress, regardless. What an achievement!

Tit for tat, we can apply our own version of bans to them. We are pricing Japan and west out of the market again.

For countries like India, they can get the required materials from imports for projects likeTejas, and the reason why Tejas can use a lot of "composite material" on the fuselage @ presumably arm-breaking prices. But still it is far from claiming itself an advanced fighter jet. It is costing so much to make. Such a pity. If they can acquire like kind material from China, the cost will be reduced by more than half which can make them price competitive against JF-17 on the world market Why do we have to concern about the west leeching on the Indians?

China only needs to take care of our national interest for all cutting edge tecnologies. This is paramount. We are not running a charitable org here.

Chinese wood carving art

 

[Bussard Ramjet]

The new question now becomes, is China banning T1000 export to hostile countries?

For now the production line hasn't started.

 

[cirr]

All US produtcs that are on the no-sales-to-China list should be banned once China is able to produce same.

I don't think so. You should play magnanimous, and open up.

As the article mentioned, and as I have full confidence on the skills of Chinese mass production, Foreign entry will never be able to compete against Chinese fibre. But you will have the moral upper hand, you can say, look we are not as crazy and protectionist as you guys. We are the ones believing in trade.

Also, anyways, most likely the markets of US and Japan and the west in general will also open up for China, and it should focus on taking a 60% market share.

Rubbish。

It has been US practice to lift ban on sales to China of certain products once they are indigenously available in China.

The US should be denied of the Chinese market for such once-restricted products。

It is only fairplay。