Skip to content
Material World
Element · Ti

Titanium

As strong as steel at half the weight, abundant in the crust, and expensive because it is difficult to extract rather than rare.

Construction material

Titanium is the ninth most abundant element in the crust and one of the more expensive structural metals. Those two facts sit together because titanium bonds so readily to oxygen, nitrogen and carbon that it cannot be smelted conventionally — molten titanium attacks its own crucible.

The Kroll process, still the industrial route, works around this in several batch steps and is slow and energy-intensive. Titanium's price is a statement about process, not about scarcity.

Uses

Aerospace structures, where the strength-to-weight ratio justifies the cost, and medical implants, where its oxide layer makes it unusually well tolerated by living tissue. By tonnage, though, most titanium is never made into metal at all: it is used as titanium dioxide, the white pigment in paint, paper and sunscreen.

Medium confidence Weak evidence

How we know: checked recently · only one source, so there is nothing to cross-check it against · stated directly by the source.

How this connects

Where a connection has been confirmed by an outside reference, that reference is named beside it.

is used as

  • Pigment — application · as titanium dioxide, which consumes more titanium by tonnage than metal production does
  • Corrosion protection — application · its passive oxide film is why it survives seawater
  • Additive manufacturing — application · powder-bed fusion of aerospace brackets and patient-specific implants, which is where the industrial value of printing metal actually sits

is produced by

  • Kroll process — process · as sponge, which must then be crushed, melted and cast before it is usable metal
  • Metallothermic reduction — process · the Kroll process is this reaction — magnesium reducing titanium tetrachloride — and this is the general case it belongs to

is extracted from

  • Rutile — mineral · the highest-grade natural feed, and the one the chloride route prefers Wikidata
  • Ilmenite — mineral · the volume source, upgraded to remove the iron before use Wikidata

is an alternative to

  • Stainless steel — alloy · where seawater or the body is involved: titanium resists both far better and weighs less, at several times the price and with machining costs to match
  • Zirconium — element · in corrosion service. Zirconium resists hot acids titanium does not, titanium resists seawater and chloride better, and the two split the chemical plant market on which fluid is in the pipe

is a source for

  • Scandium — element · from the residues of titanium and uranium processing and from bauxite tailings; no deposit is worked for scandium alone

is a component of

is found in

  • Ti-6Al-4V — alloy · 88–91% · the balance
  • Nitinol — alloy · 43–51% · the other half, and the source of the passive oxide surface that keeps the nickel away from tissue
  • Ilmenite — mineral Wikidata
  • Rutile — mineral Wikidata

is an input to

  • Anodising — process · and the colours are interference from oxide thickness rather than dye, which is why anodised titanium jewellery is coloured without pigment

Sources

  • Material World
    Our own writing
  • Wikidata
    Wikimedia Foundation · Creative Commons CC0 1.0 Universal (public domain dedication)
  • PubChem
    US National Library of Medicine · Mixed — aggregated third-party content, rights retained by depositors
  • NIST — National Institute of Standards and Technology
    United States Department of Commerce · US Government work — public information, credit requested

Questions this page answers

Where it comes from, and what it becomes

Follow Titanium back to what it starts as, and forward into what it becomes. Each step is a documented one — a real route material takes, not a chain of inference.

Upstream — what it comes from

  • Titanium → is produced by (as sponge, which must then be crushed, melted and cast before it is usable metal) → Kroll process → takes as input (converts the ore to a distillable tetrachloride, which is how the purification is done) → Chlorine → is produced by (at the anode) → Chlor-alkali electrolysis → takes as input (as the brine the cell electrolyses, and as the source of the hydrogen that comes off the cathode) → Water → is sourced from (by desalination, where energy is cheap and coastline available — the only route that adds fresh water rather than moving it) → Seawater
  • Titanium → is produced by (the Kroll process is this reaction — magnesium reducing titanium tetrachloride — and this is the general case it belongs to) → Metallothermic reduction → takes as input (the cheapest reducing metal and the commonest, and the aluminium in thermite) → Aluminium → is extracted from (via alumina — bauxite is refined by the Bayer process before smelting) → Bauxite → is sourced from (the residue of prolonged tropical weathering, which strips the silica and alkalis out of an aluminosilicate rock and leaves the aluminium behind — basalt is one common parent among several) → Basalt → is composed of (an early-crystallising constituent of basaltic magma) → Olivine
  • Titanium → is extracted from (the highest-grade natural feed, and the one the chloride route prefers) → Rutile
  • Titanium → is extracted from (the volume source, upgraded to remove the iron before use) → Ilmenite
  • Titanium → is produced by (as sponge, which must then be crushed, melted and cast before it is usable metal) → Kroll process → takes as input (the inert atmosphere, without which the titanium would take oxygen from the air) → Argon → is produced by (drawn from an intermediate height in the column, between nitrogen and oxygen) → Air separation → takes as input (the feedstock, and an unusual one in being free, unlimited and available anywhere — the cost is entirely the energy to liquefy it) → Air
  • Titanium → is produced by (as sponge, which must then be crushed, melted and cast before it is usable metal) → Kroll process → takes as input (the reducing agent, recovered afterwards by electrolysing the magnesium chloride by-product) → Magnesium → is produced by (from molten magnesium chloride, including the chloride returned by the Kroll process) → Molten salt electrolysis → takes as input (after concentration, as one of the two routes to lithium chloride) → Lepidolite

These are the most distinct paths back. Titanium can be traced through others besides.

Downstream — what it becomes

  • Titanium → is a component of (the other half of the strengthening phase) → Nickel superalloy → is used in (cast as a single crystal, because at temperature and sustained load the failure mode is creep along grain boundaries — so the boundaries are removed entirely) → Turbine blade → is associated with (the jet engine created the superalloy industry, because no existing material survived the turbine inlet — and turbine temperature has risen about 500 °C since, almost entirely on the blade) → The wartime materials programmes complete chain
  • Titanium → is a source for (from the residues of titanium and uranium processing and from bauxite tailings; no deposit is worked for scandium alone) → Scandium → is used as → Alloying
  • Titanium → is an input to (and the colours are interference from oxide thickness rather than dye, which is why anodised titanium jewellery is coloured without pigment) → Anodising → is used in (architectural aluminium, where a fifty-year finish is expected of a window frame) → Construction
  • Titanium → is used as (as titanium dioxide, which consumes more titanium by tonnage than metal production does) → Pigment
  • Titanium → is used as (its passive oxide film is why it survives seawater) → Corrosion protection
  • Titanium → is used as (powder-bed fusion of aerospace brackets and patient-specific implants, which is where the industrial value of printing metal actually sits) → Additive manufacturing

These are the most distinct paths onward. Titanium ends up in others besides.