Can carbon fiber be recycledreddit

CFRP scrap typically goes through a partial pyrolysis process which decomposes the resin, leaving clean carbon fibres. These short fibres can be used in injection moulding, or made into fabrics, either commingled with thermoplastic or ready to be infused with resin to make new parts. Several other fibre recovery processes are in development or commercial at small scale, as well as short fibre alignment technology which offers a higher value product.

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How do you choose the right drill bit for the job?There are three questions to ask when you are choosing a drill bit for a job: How is it made, what material is it made from, what is the design of the cutting tip?All good drill bits for drilling all types of steel fall under the category HSS or High Speed Steel drill bits.The very best drill bits are “Fully Ground” which means the bit was ground out of the one piece of raw material, and as such are very precise and strong. The table below outlines some of the more popular answers as to the second question: What material are they made from. All of these HSS drill bits are superior to carbon steel in that they can withstand higher temperatures without losing their temper (hardness). This property allows HSS to cut faster, and at room temperature HSS grades generally display high hardness. The types of HSS Steel used in Drill Bits are below:The Best Drill Bits Comparison Table

Composites are designed to be stiff, strong and durable, which enables light weight structures for transport and critical technologies like wind turbine blades and high pressure tanks. It also means they last a long time. Wind turbine blades are routinely recertified for extended lifetimes, composite boats and ships are often refurbished for reuse and roofing and cladding materials can have three or more times the lifetime of steel alternatives. But the same excellent properties make composites inherently resistant to being broken down for recycling.

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The FRP Circular Economy Study, 2018, assessed the best way forward for disposal/recycling of larger scale fibre reinforced polymer waste in terms of cost and environmental impact in the UK.

Natural fibre composites can be ground and used as filler, but as they are first-generation bio-derived, it makes sense to reclaim the embodied energy by combustion. Thermoplastic composites can be shredded and compounded for re-use in injection moulding.

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Glass fibres are lower in value, so a different approach is taken. In some cases, ground GFRP is used in-house in new products. GFRP scrap can be co-incinerated in cement kilns, where the polymer is burnt for energy, and the glass (aluminosilicate) and any calcium carbonate filler are recycled into cement clinker, displacing mined resources. Increasingly, GFRP waste is being sent either to energy from waste or to cement kilns instead of landfill. Work is under way to commercialise thermal processes for GFRP, which becomes more viable with economies of scale.

Do Coatings Make a Difference? TiN (Titanium Nitride) coatings can increase the wear resistance and lubricity at the cutting point and facilitate use higher speeds and feeds M2 Metal Step Drill Bit Set: 4mm-12mm, 8 Stepsand improve tool life. TiN coated tools can easily be identified by the characteristic golden colour coating on HSS tools. TiN coating can increase the cost of drills by 30 to 50% depending on size and batch quantity and practically about 30-100% increase in drilling speeds can be applied with coated drills.All Smith & ARROW Step Drills are M2 HSS bits are TiN (Titanium Nitride) coated.BUY Smith & ARROW Step Drill Bits HereMain Considerations when Buying Drill Bits

It is sometimes said that composites can’t be recycled but this is not the case. Both carbon (CFRP) and glass fibre (GFRP) composites are being recycled commercially, and have been for over a decade. Supply chains for commercial recycling routes are still limited, processes are generally not closed-loop and economic viability is challenging, but solutions have emerged and continue to be improved for gaining value from end of life composite materials, contributing to a circular economy.

Current commercial solutions, available in the UK, for reuse and recycling of composites and composite manufacturing scrap can be found at What Can I Do with my Waste?

The design of the cutting tip is also very important. Perhaps the most popular tip design has a 135 degree “split point” design giving accurate starting without the use of a center punch.The Best HSS Bit Depends on your ApplicationThe most popular HSS drill bits fall into the following two categories: M2 & M35. Depending if you are drilling mild steel or hardened steel will determine whether you purchase M2 or M35 drill bits:M2 DRILL BITSM2 is a HSS drill bit compound that has high wear resistance and is used in all general steel drilling applications involving standard / mild / black steel. M2 retains its cutting edge longer than other general purpose high speed steel drill bits when working in general steel engineering applications, however, is not as shock resistant or as flexible as other HSS grades with less tungsten. Drill bits made from M2 material are generally favoured for high production machine work.Pros:

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Commercially available materials, supplied by Composites UK members, with recycled or bio-based content are listed at Materials with Bio/Recycled Content.

Composites Recycling – Where are we now?, 2016, produced by Composites UK with the universities of Birmingham, Nottingham and Manchester gives more details of the recycling processes available for carbon and glass fibre waste.

BUY Fully Ground, M2, 135 Degree Split Point Smith & ARROW Drill Bits HereM35 DRILL BITSM35 is similar to M2, but with 5% cobalt added – NOTE: M42 is almost the same but with 8% cobalt and is generally considered a very specialised bit and is more brittle than M35. The key purpose of adding up the cobalt is to enhance the heat resistance capacity and durability of the bits, however, it is very important to note that M35 bits work best and last longest if run at slow working speeds with lubricant. Used primarily for drilling Stainless Steel, these bits gain the property of endurance against the high temperature due to cobalt metal.This HSS material was developed to tackle drilling of tough materials like Stainless steel, Inconel, tool steels and titanium alloys.Pros:

A description of composite end of life solutions is given in chapter 8 of Composites UK’s Sustainability of FRP Composites – A Good Practice Guide, 2022. (Download link via a short survey). Chapter 2 introduces design for circularity principles, chapter 4 addresses use of recycled materials, and chapter 9 covers policy and regulation.