Atmosphere Furnaces

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Atmospheric Furnace, Materials, Crude Heater, Fired Heater, Internals, Refractory, Support
  Atmosphere Furnaces Refractories For Atmosphere Furnaces Many of the metal oxides found in traditional refractories will reduce and reoxidize in hydrogen atmosphere furnaces, so it is important to understand this reaction when specifying furnace refractory and kiln furniture. This reaction canlead to premature refractory repairs, inconsistent furnace operation andpoor production yields. To avoid these costly and time consumingprolems, it is important to select the correct refractories.!aint #oain $eramics %!#$& has een designing and manufacturinghigh performance refractories for demanding atmosphere furnacesfor over '( years. )ur team of application engineers, material scientistsand design engineers understands the conditions in atmospherefurnaces and can help you choose the correct material for yourapplication.  *+#* Temperature Atmosphere Furnaces Furnace Refractory Alundum® 99 furnace refractory (muffles, brick and hearth plates) should  be specified in hydrogen atmosphere furnaces that operate from 2200 - 300! (#20$ - #%&0!') his refractory *ill minimi+e or eliminate the contamination and degradation that results from the reduction and re-oidation of silica, soda and potassia found in many refractory shapesur #99, 299 and $99 alumina mies are stable in the driest, high temperature furnaces because they are produced *ith limited amounts of these impurities Alundum $99, a bubble alumina mi, has less than 00$. silica, and 00$. soda and potassia ur high strength dense aluminamies, #99 and 299, typically ha/e less than 00&. silica and 02$. soda and potassia o put these numbers into perspecti/e, #000 almost pure  brick *ith as little as 0$. silica can generate 2$ lbs (##1g) of un*anted deposits in a furnace hese deposits can ad/ersely affect the life of your refractory lining and can negati/ely impact your production yieldsur Alundum 99 furnace refractory systems pro/ide long lasting, durable, stable linings in hydrogen atmosphere furnaces that are used to sinter  po*ered metal (4) and metal in5ection molded (464) parts,  polycrystalline alumina tubes, uranium oide fuel pellets and in furnaces, bright annealing stainless steel Alundum and 7irnorite®8 (calcia stabili+ed +irconia) refractory are also used in furnaces that anneal and sinter specialty metals like tungsten and molybdenum ses- Muffles Alundum 299 high purity alumina mufflesare used to control firing conditions and to pro/ide a stable, *ear resistant supportmedium for resistance heated atmosphere pusher furnaces at temperatures up to300! (#%&0!') he molybdenum *iretypically used in these electrically heatedfurnaces is held in place and protected *ith our high purity Alundum  A#39 embedding cement he muffles are designed to accommodate  pusher plates :#2 (30$mm) *ide and are produced in sections up to % (#2#9mm) long rick  Alundum $99 makes an eceptionallystable bubble brick that can be safelyused as part of a furnace lining up to3#;%! (#&;0!') Alundum #99 and299 can be used to produce brick shapes that support hea/y loads infurnaces up to 300! (#%&0!') <ealso produce insulating and dense+irconia brick for furnaces that operate up to 000! (2200!') <e produce these mies in many brick shapes, including most industry standards *earth /lates Alundum #99 and 299 hearth plates pro/ide a long lasting, *ear resistant push surface at temperatures up to300! (#%&0!') hese mies ha/eecellent creep and sag resistance, butto maimi+e their life it is important toensure they are properly supported helength of the #99299 hearth platesshould be minimi+ed because of the limited thermal shock resistance of high purity alumina 0)1 Temperature Atmosphere FurnacesFurnace Refractory 4ost traditional kaolin-based, silicarich, refractory brick and fiber can be used to insulate lo* temperature (20$0! , ##20!') atmosphere (hydrogen- nitrogen) belt furnaces because these furnaces generally operate in atmospheres and at temperatures and de* points *here silica is stablehese furnaces, *hich are used to sinter, bra+e and normali+e 4 parts, typically incorporate silicon carbide (=i') based structural furnace refractory   because it has ecellent creep resistance, *ear resistance, and thermal conducti/ity eams 'rystar® 2000, =ilit®=1, and >eoloy® =i' beams can be used as structural supports for ceramic and alloy muffles in belt furnacesAt up to #0 times the strength of traditionalsilicon carbide plates, =i' beams pro/ide alight*eight, strong alternati/e =ilicon carbide beams are produced in sections as small as 0$ 0$ (#2&  #2&mm) and as long as #20(30%mm) Muffles 'rystolon®#;3 silicon-oynitridebonded=i' and Alundum #9#A alumina- mullitemuffle sections are used in atmosphere beltfurnaces that sinter traditional 4 partsur ceramic muffle sections ha/e replacedalloy muffles in many belt furnaces because of their creep and *ear resistance 'eramic mufflesections can reduce the costs associated *iththe replacement of standard alloy muffleshese sections are produced to accommodate belts up to 3; (9#$mm) *ide /lates 'arbofra® A, 'rystolon #;3, and'ryston® #%3 or #$9 =i' plates areused to pro/ide #00. support for ceramic and alloy muffle sections=i' plates can be produced in a/ariety of standard si+es
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