Refractory Castable

คอนกรีตทนไฟ (อังกฤษ: Refractory Castable) เป็นวัสดุทนไฟประเภทหนึ่ง ที่มีลักษณะและวิธีการใช้งานคล้ายกับคอนกรีตที่ใช้ในงานก่อสร้าง แต่เนื้อวัสดุที่นำมาใช้ผลิตเป็นคอนกรีตทนไฟ จะเป็น Refractory Material ซึ่งรวมถึง เม็ดวัตถุดิบหยาบ (Aggregate) และ สารประสาน (Binder) ซึ่งมักจะเป็น High Alumina Cement

[แก้]ประเภทของคอนกรีตทนไฟ

คอนกรีตทนไฟ สามารถแบ่งเป็นประเภทได้โดยเกณฑ์ที่แตกต่างกัน เช่น

1.แบ่งตามปริมาณ แคลเซียมออกไซด์ (CaO) ที่เป็นองค์ประกอบในเนื้อผลิตภัณฑ์ ได้ดังนี้

1.Conventional Castable เป็นคอนกรีตทนไฟ ที่มีปริมาณองค์ประกอบ CaO อยู่ในปริมาณสูง กว่า 2%

2. Low Cement Castable เป็นคอนกรีตทนไฟ ที่มีปริมาณองค์ประกอบ CaO อยู่ในกระมาณต่ำกว่า 2%

3. Cementless Castable เป็นคอนกรีตทนไฟ ที่มีปริมาณองค์ประกอบ CaO ต่ำกว่า 0.2%

แบ่งตามลักษณะในการติดตั้ง

1. Vibrating Castable คอนกรีตทนไฟ ที่ติดตั้ง โดยการหล่อแบบ โดยใช้การเขย่าช่วย

2. Self flow Casatble คอนกรีตทนไฟ ที่ติดตั้ง โดยการหล่อแบบ โดยใช้การ

3. Gunning Material คอนกรีตทนไฟ ที่ติดตั้ง โดยการใช้เครื่องยิง

1. Wet Gunning Material คอนกรีตทนไฟ ที่ติดตั้งโดยใช้เครื่องยิง โดยต้องทำการผสมกับน้ำให้เข้ากันก่อนนำไปติดตั้งโดยใช้เครื่องยิง

2. Dry Gunning Material คอนกรีตทนไฟ ที่ติดตั้งโดยใช้เครื่องยิง โดยไม่ต้องผสมกับน้ำก่อนนำไปใช้งาน

ผลิตภัณฑ์จะมีลักษณะเป็นผงแห้ง จะถูกบรรจุเข้าในเครื่องยิง แล้วจะถูกอัดด้วยแรงดันลม ไปตามท่อยาง จนถึงหัวยิง (Nozzle)โดยจะมีจุดเชื่อมต่อกับท่อน้ำที่ปลายท่อยิง ผลิตภัณฑ์จะผสมกับน้ำที่ ปลายท่อยิง ก่อนจะถูกยิงออกไป

Reractory Castable

Product Category : Material Handling Components

Reractory Castable Top & Bottom Blocks is used to hold the induction coil tightly in middle of the tilting furnace box with help of vertical tie rods. Thermafield Power Components Private Limited manufactures Reractory Castable Top & Bottom Blocks. Thermafield Power Components Private Limited supplies different types of induction furnace insulating materials, coil supports and non asbestose sheets, induction furnace hydraulic spares, carbon free hoses, hydraulic cylinders, he plates, duraline induction melting furnace assembly etc. Reractory Castable Top & Bottom Blocks is made from mixture of refractory material, S.S. Reinforcement and certain percentage of water to make the cast formation in fabricated mould. This Reractory Castable Top & Bottom Blocks give the base support to hold the coil and keep in shape while tilting of the furnace.

Salient features of Reractory Castable Top & Bottom Blocks are:

-Durable

-Fire resistant

-Heat resistant

-Chemical resistant

-High strength

-Flame retardant

Silicon Nitride Product

casatables are extensively used for back-up and hot face linings.

Their low density and low thermal conductivity helps in conserving heat energy and reducing fuel costs.

These are low iron content insulating castables, suitable for use in reducing atmosphere

with higher strengths coupled with the advantage of low thermal conductivities.

Persico uses Araldite adhesive for racing yacht

ITALIAN YACHT MAKER PERSICO HAS USED A HUNTSMAN ADVANCED MATERIALS ADHESIVE IN THE BUILD OF A NEW DESIGN OF VOLVO OPEN 70 RACING YACHT FOR THE ABU DHABI TOURISM AUTHORITY.

Built by Persico at its Nembro site in Italy, the ‘Abu Dhabi’ is a 70 ft long vessel which is designed to weigh less, and be more robust, than other yachts in its class.

To achieve the high levels of component endurance and performance required to compete in demanding yacht races, Persico has used Huntsman Advanced Materials' Araldite® AW4859 / Hardener HW4859 adhesive to complete the yacht. The adhesive fixes together different highly loaded components, from bonding titanium fittings to the yacht’s carbon structure, to assembling the hatch, rudder bearing sleeves and components, bow sprit, chain-plate, mast and keel structure.

Araldite AW4859 / Hardener HW4859 is a new structural adhesive designed for composite bonding. It is also suitable for bonding dissimilar substrates such as metals or thermoplastics. According to Huntsman, the key features of this adhesive are its sag resistance, gap filling properties up to 4 mm, high temperature resistance (140°C) and good moisture and chemical resistance.

The adhesive is also said to exhibit outstanding fracture toughness and lap shear strengths up to 35 MPa on carbon and glass fibre reinforced plastics.

“We selected Araldite AW4859 / Hardener HW4859 for its proven ability to deliver outstanding performance to marine applications," explains Mark Somerville from Persico.

"When it comes to delivering the exact levels of stiffness required to ensure the ‘Abu Dhabi’ performs well in racing conditions, Araldite® AW4859 / Hardener HW4859 is certainly living up to our expectations. We have been particularly impressed with its shear strength, coupled with its ability to withstand heavy loads, intensive strain and extreme conditions, as well as its bonding properties to the components and substrates on our racing yacht.”

Another Huntsman adhesive, Araldite420 A/B is used to bond many other details on the boat.

Aluminium mesh is used as the infill to make security door, grille, fence and partition as illustrated in the the photos of this posting.

It can also be used for making machinery guards, security enclosures, decorative cum security screens, open air shelves and etc.

There are numerous benefits in choosing the aluminium mesh for the above mentioned usage/ purpose, namely, anti-rust, fire proof, vermin proof, good visibility, easy passage of air and light while ensuring security and protection.

What are Refractory Materials?

There was a time when I would simply pull out my trusty Webster’s Tome. I would efficiently thumb to the desired entry, proudly making full use of the alphabetical skills acquired through years of primary education. Voila! Having quickly located the desired term, I would faithfully and obediently parrot the appropriate definitions. But times have changed, and I have kept up with them. I now depend, as I’m sure is true for most of us, on Google and Wikipedia for my primary didactic guidance.

So I Googled “Refractory”.

Webster could never have anticipated the boundless diversity of definition declared relative by Google’s algorithms! You may enjoy looking for yourself, but let me assure you that for our purposes, refractory is not “the recovery phase after orgasm during which it is physiologically impossible for an individual to have additional orgasms” http://en.wikipedia.org/wiki/Refractory_period(sex)

And did you know that in the religion of the Vedic period in India, there are certain words that, when used as a Mantra, affect a spiritual transformation in the individual repeating them? Om (or Aum) is perhaps the most well known. The meaning of the words (and the self) becomes lost in the rhythm of repetition. The void that this loss creates invites change and hopefully an accompanying enlightenment. 

How in the world did I get from “Refractory” to refractory Karmas? The Six Degrees of Separation of People states that each person on Earth is only 6 acquaintances from every other person. I’d like to be the first to declare a similar relationship for information, my just conceived and soon to be famous Six Clicks of Separation of Information theory, each topic searched for is only 6 clicks away from all other topics

I’m tempted yet again to abandon this new hyperlink knowledge fest and dust off my trusted old tome. But I never do. I love this new world of fast and easy information. I love having the world’s largest library sitting on my desk. Maybe I won’t become famous for my theory, but I’ll bet one day I’ll learn to use technology as efficiently as that old dictionary.

In the mean time, you’ll have to read more of the blog to know what our discussion is all about. Since I already know, I’m just going to go practice my mantra. “Aum refractory, Aum refractory, Aum refractory…”

Greg Gorby, Editor

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